CN116166083A - Low dropout linear voltage stabilizing circuit and buck circuit - Google Patents
Low dropout linear voltage stabilizing circuit and buck circuit Download PDFInfo
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- CN116166083A CN116166083A CN202310437291.XA CN202310437291A CN116166083A CN 116166083 A CN116166083 A CN 116166083A CN 202310437291 A CN202310437291 A CN 202310437291A CN 116166083 A CN116166083 A CN 116166083A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a low-dropout linear voltage stabilizing circuit and a buck circuit. The low-dropout linear voltage stabilizing circuit comprises an input module, an output module, a coupling module and a response module; the input module is used for converting the input voltage into first voltage, the output module is connected with the input module, and the output module is used for outputting a voltage signal according to the first voltage; the coupling module is connected with the output module and is used for coupling voltage signals; the control end of the response module is connected with the first control signal input end, the first end of the response module is connected with the first signal input end and the coupling module, the first control signal input by the first control signal input end and the first signal provided by the first signal input end are used for controlling the conduction of the response module, and the response module is used for responding to the coupled voltage signal and outputting response current; the output module is connected with the response module and is used for adjusting the voltage signal according to the response current so as to improve the transient response speed of the low-dropout linear voltage stabilizing circuit.
Description
Technical Field
The embodiment of the invention relates to the technical field of voltage conversion, in particular to a low-dropout linear voltage stabilizing circuit and a buck circuit.
Background
In an electronic apparatus using a direct current source, a voltage converter is required to convert the voltage of a power supply into a desired operating voltage. BUCK circuits, a widely used BUCK conversion circuit, are mainly used for direct current to direct current (DC-DC) BUCK conversion, and are generally applicable to the field of low-voltage and high-current applications.
A Low Drop Out (LDO) circuit may provide an operating voltage for the BUCK circuit. For example, the LDO circuit may provide power to devices in the BUCK circuit. Illustratively, the LDO circuit may provide power to amplifiers, comparators, pulse width modulators, zero point detectors, and the like in the BUCK circuit. Fig. 1 is a schematic diagram of a low dropout linear voltage regulator circuit according to the prior art. As shown in fig. 1, in the prior art, a voltage dividing resistor R7 in the LDO circuit divides an input voltage signal vin to form a divided voltage signal, and outputs the divided voltage signal to an output transistor M21 after filtering the divided voltage signal vin through a filter resistor R37 and a filter capacitor C1, and the output transistor M21 outputs a desired output voltage vdd a according to the voltage signal vin and the divided voltage signal. One end of the filter capacitor C1 is grounded GND. Fig. 2 is a signal diagram of an output voltage corresponding to the low dropout linear voltage regulator provided in fig. 1. As shown in fig. 2, when the output voltage vdd a suddenly changes, the LDO circuit itself adjusts the output voltage vdd a slowly, so that the output voltage vdd a provided by the LDO is unstable, which affects the stability and reliability of the LDO when the LDO is used to provide voltages in other circuits.
Disclosure of Invention
The invention provides a low-dropout linear voltage stabilizing circuit and a buck circuit, which are used for improving the transient response speed of the low-dropout linear voltage stabilizing circuit.
In a first aspect, an embodiment of the present invention provides a low dropout linear voltage regulator circuit, including an input module, an output module, a coupling module, and a response module;
the input module is used for converting input voltage into first voltage, the output module is connected with the input module, and the output module is used for outputting a voltage signal according to the first voltage; the coupling module is connected with the output module and is used for coupling the voltage signals; the control end of the response module is connected with the first control signal input end, the first end of the response module is connected with the first signal input end and the coupling module, the first control signal input by the first control signal input end and the first signal provided by the first signal input end are used for controlling the response module to be conducted, and the response module is used for responding the coupled voltage signal and outputting response current; the output module is connected with the response module and is used for adjusting the voltage signal according to the response current.
Optionally, the response module includes a switching transistor and a current mirror;
the control electrode of the switching transistor is connected with the first control signal input end, the first electrode of the switching transistor is connected with the first signal input end and the coupling module, the second electrode of the switching transistor is connected with the input end of the current mirror, and the output end of the current mirror is connected with the output module.
Optionally, the low-dropout linear voltage stabilizing circuit further comprises a discharging module, wherein a control end of the discharging module is connected with the second control signal input end, a first end of the discharging module is connected with the first potential input end, and a second end of the discharging module is connected with the coupling module; the state of the discharging module is controlled by the first control signal and the second control signal input by the second control signal input end to be opposite to the state of the response module.
Optionally, the discharge module includes a first transistor; the control electrode of the first transistor is connected with the second control signal input end, the first electrode of the first transistor is connected with the first potential input end, and the second electrode of the first transistor is connected with the coupling module.
Optionally, the first control signal input terminal is multiplexed to the second control signal input terminal, and when the response module includes a switching transistor, the type of the switching transistor is opposite to the type of the first transistor.
Optionally, the low dropout linear voltage regulator circuit further comprises a first inverting unit; the first inverting unit comprises an odd number of first inverters connected in series; the input end of the first inverting unit is connected with the first control signal input end, the output end of the first inverting unit is used as the second control signal input end, and when the response module comprises a switching transistor, the type of the switching transistor is the same as the type of the first transistor.
Optionally, the low dropout linear voltage regulator circuit further includes a second inverting unit, where the second inverting unit includes an odd number of second inverters connected in series; the input end of the second inverting unit is connected with the first control signal input end, and the output end of the second inverting unit is connected with the control end of the response module and the input end of the first inverting unit.
Optionally, the coupling module includes a coupling capacitor; the first pole of the coupling capacitor is connected with the output module, and the second pole of the coupling capacitor is connected with the response module.
Optionally, the input module comprises a voltage dividing circuit, and the output module comprises an output switching tube;
the first input end of the voltage dividing circuit is used as the input end of the low-dropout linear voltage stabilizing circuit, the second input end of the voltage dividing circuit is connected with the second potential input end, the output end of the voltage dividing circuit is connected with the control electrode of the output switching tube, the first electrode of the output switching tube is connected with the input voltage, and the second electrode of the output switching tube is used as the output end of the low-dropout linear voltage stabilizing circuit.
In a second aspect, an embodiment of the present invention further provides a buck circuit, including the low dropout linear regulator circuit of the first aspect.
According to the technical scheme, after the output module provides the voltage signal, when the voltage signal changes, the coupling module couples the change of the voltage signal and outputs the voltage signal to the response module, the response module directly responds to the coupled voltage signal in a conducting state and feeds back the response current to the output module, so that the output module can quickly adjust the output circuit according to the response current, the time required by the response module to respond to the voltage signal is reduced, the response time of the low-dropout linear voltage stabilizing circuit is reduced through feedback adjustment, and the transient response speed of the low-dropout linear voltage stabilizing circuit is improved. When the low dropout linear voltage regulator circuit is used for providing voltage for other circuits, the stability and reliability of the other circuits can be improved.
Drawings
FIG. 1 is a schematic diagram of a low dropout linear voltage regulator circuit according to the prior art;
FIG. 2 is a schematic diagram of an output voltage corresponding to the low dropout linear regulator provided in FIG. 1;
fig. 3 is a schematic structural diagram of a low dropout linear voltage regulator circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a voltage signal corresponding to the LDO provided in FIG. 4;
FIG. 6 is a schematic diagram of a voltage waveform of a control electrode of an output switch tube according to an embodiment of the present invention;
fig. 7 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention;
fig. 10 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention;
fig. 12 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a buck circuit according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 3 is a schematic structural diagram of a low dropout linear voltage regulator circuit according to an embodiment of the present invention. As shown in fig. 3, the low dropout linear voltage regulator circuit includes an input module 110, an output module 120, a coupling module 130, and a response module 140; the input module 110 is configured to convert the input voltage VIN into a first voltage, the output module 120 is connected to the input module 110, and the output module 120 is configured to output a voltage signal vdd according to the first voltage; the coupling module 130 is connected with the output module 120, and the coupling module 130 is used for coupling the voltage signal vdd; the control end CTRL1 of the response module 140 is connected to the first control signal input end EN1, the first end S1 of the response module 140 is connected to the first signal input end IN1 and the coupling module 130, the first control signal input by the first control signal input end EN1 and the first signal provided by the first signal input end IN1 are used for controlling the response module 140 to be turned on, and the response module 140 is used for responding to the coupled voltage signal vdd and outputting a response current; the output module 120 is connected to the response module 140, and the output module 120 is configured to adjust the voltage signal vdd according to the response current.
Specifically, the input module 110 may perform voltage conversion on the input voltage VIN to form a first voltage and output the first voltage to the output module 120, and the output module 120 outputs a voltage signal vdd of the low dropout linear voltage regulator circuit according to the first voltage to provide a dc voltage for other circuits. The low dropout linear regulator circuit further includes a coupling module 130, where the coupling module 130 is connected to the output module 120, and can obtain the voltage signal vdd provided by the output module 120, and when the voltage signal vdd suddenly changes, the coupling module 130 can couple the change of the voltage signal vdd and output the voltage signal vdd to the response module 140. The response module 140 is in a conducting state under the action of the first control signal and the first signal, when the coupled voltage signal vdd is output to the response module 140, the response module 140 can rapidly respond to the voltage signal vdd to output a response current, so that the time required by the response module 140 to respond to the voltage signal vdd is reduced, and the response speed of the response module 140 is improved. Then, the response current is output to the output module 120 to realize feedback adjustment of the voltage signal vdd, and then the output module 120 can quickly adjust the voltage signal vdd according to the response current, so that the transient response speed of the low dropout linear voltage regulator circuit can be improved. When the low dropout linear voltage regulator circuit is used for providing voltage for other circuits, the stability and reliability of the other circuits can be improved.
According to the technical scheme, after the output module provides the voltage signal, when the voltage signal changes, the coupling module couples the change of the voltage signal and outputs the voltage signal to the response module, the response module directly responds to the coupled voltage signal in a conducting state and feeds back response current to the output module, so that the output module can rapidly adjust the output circuit according to the response current, the time required by the response module to respond to the voltage signal is reduced, the response time of the low-dropout linear voltage stabilizing circuit is reduced through feedback adjustment, and the transient response speed of the low-dropout linear voltage stabilizing circuit is improved. When the low dropout linear voltage regulator circuit is used for providing voltage for other circuits, the stability and reliability of the other circuits can be improved.
Fig. 4 is a schematic structural diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention. As shown in fig. 4, the response module 140 includes a switching transistor M1 and a current mirror 141; the control electrode of the switching transistor M1 is connected to the first control signal input terminal EN1, the first electrode of the switching transistor M1 is connected to the first signal input terminal IN1 and the coupling module 130, the second electrode of the switching transistor M1 is connected to the input terminal of the current mirror 141, and the output terminal of the current mirror 141 is connected to the output module 120.
Specifically, the first control signal provided by the first control signal input terminal EN1 controls the switching transistor M1 to be in a conductive state. For example, as shown in fig. 4, when the switching transistor M1 is a P-type transistor, the first control signal may be low level. When the switching transistor M1 is an N-type transistor, the first control signal may be high. The first signal provided by the first signal input terminal IN1 may be a bias current for providing the switching transistor M1 with an on-current. When the voltage signal vdd changes, the coupling module 130 couples the voltage signal vdd and outputs the voltage signal vdd to the first pole of the switching transistor M1, so that the potential of the first pole of the switching transistor M1 changes according to the coupled voltage signal vdd, then the switching transistor M1 forms a response current according to the potential difference between the control pole and the first pole and transmits the response current to the current mirror 141, the current mirror 141 outputs the response current to the output module 120 through mirroring, so as to realize current feedback adjustment of the voltage signal vdd, and then the output module 120 adjusts the voltage signal vdd rapidly according to the response current, thereby improving the transient response speed of the low dropout linear voltage regulator circuit.
As shown in fig. 4, the output module 120 includes an output switch tube M2, a control electrode G1 of the output switch tube M2 is connected to an output end of the current mirror 141, a first electrode of the output switch tube M2 is connected to the input voltage VIN, and a second electrode of the output switch tube M2 is used as an output end of the low dropout linear voltage regulator circuit for outputting the voltage signal vdd. In which the output switching transistor M2 is exemplarily shown as an N-type transistor in fig. 4. Fig. 5 is a schematic waveform diagram of a voltage signal corresponding to the low dropout linear voltage regulator circuit provided in fig. 4, and fig. 6 is a schematic waveform diagram of a voltage of a control electrode of an output switching tube provided in an embodiment of the present invention. As shown in fig. 4 to 6, when the voltage signal vdd decreases, the coupling module 130 couples the voltage change to the first pole of the switching transistor M1, so that the potential of the first pole of the switching transistor M1 decreases, thereby increasing the potential difference between the control pole and the first pole of the switching transistor M1, the on current of the switching transistor M1 increases and is output to the current mirror 141, the current mirror 141 feeds back the on current to the control pole of the output switching transistor M2, so that the potential of the control pole G1 of the output switching transistor M2 increases, thereby increasing the conduction degree of the output switching transistor M2, further increasing the on current of the output switching transistor M2, improving the voltage signal vdd output by the output switching transistor M2, realizing the feedback adjustment of the voltage signal vdd, and improving the transient response speed of the low-dropout linear voltage stabilizing circuit.
It should be noted that, the current mirror 141 provided in the embodiment of the present invention may include a first switching tube M11, a second switching tube M12, a third switching tube M13, and a fourth switching tube M14. The first pole of the first switching tube M11, the grid of the first switching tube M11 and the grid of the second switching tube M12 are connected and serve as input ends of the current mirror 141, the second pole of the first switching tube M11 is connected with the first pole of the third switching tube M13, the grid of the third switching tube M13 and the grid of the fourth switching tube M14, the second pole of the third switching tube M13 and the second pole of the fourth switching tube M14 are connected with input signals, the first pole of the fourth switching tube M14 is connected with the second pole of the second switching tube M12, and the first pole of the second switching tube M12 serves as output ends of the current mirror 141 and is used for outputting response currents.
With continued reference to fig. 4, the coupling module 130 includes a coupling capacitor C1; the first pole of the coupling capacitor C1 is connected to the output module 120, and the second pole of the coupling capacitor C1 is connected to the response module 140.
Specifically, the coupling capacitor C1 has a coupling effect, when the voltage signal vdd provided by the output module 120 changes in a transient manner, the coupling capacitor C1 can couple the variable quantity of the voltage signal vdd to the first pole of the switching transistor M1, so that the voltage difference between the control pole and the first pole of the switching transistor M1 changes along with the change of the voltage signal vdd, and further, the on current of the switching transistor M1 changes, and then the on current is fed back to the control pole of the output switching transistor M2 to control the potential of the control pole of the output switching transistor M2, so that the output switching transistor M2 adjusts the on degree according to the change of the voltage signal vdd in a feedback manner, thereby improving the speed of the output switching transistor M2 responding to the voltage signal vdd and improving the transient response speed of the low-dropout linear voltage stabilizing circuit.
Fig. 7 is a schematic structural diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention. As shown in fig. 7, the low dropout linear voltage regulator circuit further includes a discharging module 150, a control end of the discharging module 150 is connected to the second control signal input end EN2, a first end of the discharging module 150 is connected to the first potential input end V1, and a second end of the discharging module 150 is connected to the coupling module 130; the second control signal input from the first control signal and the second control signal input terminal EN2 controls the state of the discharging module 150 to be opposite to the state of the response module 140.
Specifically, when the low dropout linear voltage regulator circuit works for the voltage signal vdd, the first control signal controls the response module 140 to be turned on, the second control signal controls the discharge module 150 to be turned off, the response module 140 responds to the voltage output by the coupling module 130 and outputs the voltage to the output module 120, so that feedback regulation of the voltage signal vdd is realized, and the transient response speed of the low dropout linear voltage regulator circuit is improved. When the low-dropout linear voltage stabilizing circuit does not work, the first control signal controls the response module 140 to cut off, so that the power consumption of the response module 140 is avoided, and the energy consumption of the low-dropout linear voltage stabilizing circuit is saved. The second control signal controls the discharge module 150 to be conducted, and the electric quantity on the coupling module 130 is released through the discharge module 150, so that the electrostatic danger of the low-dropout linear voltage stabilizing circuit is reduced, and the safety of the low-dropout linear voltage stabilizing circuit is improved. Illustratively, the first potential input terminal V1 may be a ground terminal, and the electric quantity on the coupling module 130 is released to the ground terminal through the discharging module 150, so as to ensure the discharging reliability.
Fig. 8 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention. As shown in fig. 8, the discharging module 150 includes a first transistor T1; the control electrode of the first transistor T1 is connected to the second control signal input terminal EN2, the first electrode of the first transistor T1 is connected to the first potential input terminal V1, and the second electrode of the first transistor T1 is connected to the coupling module 130.
Specifically, the second control signal provided by the second control signal input terminal EN2 may control the on or off of the first transistor T1. The first transistor T1 may be a P-type transistor, and the first transistor T1 is turned on when the second control signal is at a low level. When the second control signal is at a high level, the first transistor T1 is turned off. The first potential input terminal V1 may be a ground terminal. When the low dropout linear voltage regulator circuit does not work, the second control signal controls the first transistor T1 to be conducted, and the electric quantity on the coupling module 130 is released to the grounding end through the first transistor T1, so that the electrostatic danger of the low dropout linear voltage regulator circuit is reduced, and the safety of the low dropout linear voltage regulator circuit is improved.
Fig. 9 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention. As shown in fig. 9, when the response module 140 includes the switching transistor M1, the type of the switching transistor M1 is opposite to the type of the first transistor T1 when the first control signal input terminal EN1 is multiplexed to the second control signal input terminal EN 2.
Specifically, when the response module 140 includes the switching transistor M1, the switching transistor M1 may be set to be of a type opposite to that of the first transistor T1 such that the first control signal input terminal EN1 is multiplexed to the second control signal input terminal EN2, i.e., the first control signal is multiplexed to the second control signal. When the first control signal controls the switching transistor M1 to be turned on, the first control signal simultaneously controls the first transistor T1 to be turned off. When the first control signal controls the switching transistor M1 to be turned off, the first control signal simultaneously controls the first transistor T1 to be turned on. Therefore, the arrangement of the signal port can be reduced, and the low dropout linear voltage stabilizing circuit is beneficial to simplification.
Fig. 10 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention. As shown in fig. 10, the low dropout linear voltage regulator circuit further includes a first inverting unit 160; the first inverting unit 160 includes an odd number of first inverters 161 connected in series; the input terminal of the first inverting unit 160 is connected to the first control signal input terminal EN1, and the output terminal of the first inverting unit 160 is used as the second control signal input terminal EN2, and when the response module 140 includes the switching transistor M1, the type of the switching transistor M1 is the same as the type of the first transistor T1.
Specifically, the odd number of first inverters 161 connected in series may invert the first control signal provided from the first control signal input terminal EN1 and then control the on or off of the first transistor T1 as the second control signal provided from the second control signal input terminal EN 2. Illustratively, the first inverting unit 160 is illustratively shown in fig. 10 as including a first inverter 161. When the first control signal is at a high level, the first control signal is transmitted to the control electrode of the switching transistor M1, and simultaneously the first control signal becomes a low level after passing through the first inverting unit 160, and then is transmitted to the control electrode of the first transistor T1. And the type of the switching transistor M1 is the same as the type of the first transistor T1, the states of the switching transistor M1 and the first transistor T1 are opposite. For example, the switching transistor M1 and the first transistor T1 are P-type transistors, and when the first control signal is at a low level, the first control signal controls the switching transistor M1 to be turned on, and the first control signal changes to a high level after passing through the first inverting unit 160 and controls the first transistor T1 to be turned off as the second control signal. When the first control signal is at a high level, the first control signal controls the switching transistor M1 to be turned off, and the first control signal becomes a low level after passing through the first inverting unit 160 and controls the first transistor T1 to be turned on as a second control signal. By providing the first inverting unit 160 and the switching transistor M1 of the same type as the first transistor T1, the provision of the signal port can be reduced, which is advantageous for simplifying the low dropout linear voltage regulator circuit.
Fig. 11 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention. As shown in fig. 11, the low dropout linear voltage regulator circuit further includes a second inverter unit 170, the second inverter unit 170 including an odd number of second inverters 171 connected in series; an input terminal of the second inverting unit 170 is connected to the first control signal input terminal EN1, and an output terminal of the second inverting unit 170 is connected to a control terminal of the response module 140 and an input terminal of the first inverting unit 160.
Specifically, an odd number of second inverters 171 connected in series are connected in series between the first control signal input terminal EN1 and the response module 140, so that the first control signal is input to the control terminal of the response module 140 after being inverted. Meanwhile, an odd number of second inverters 171 connected in series are connected in series between the first control signal input end EN1 and the first inverting unit 160, so that the first control signal is inverted twice and then used as a second control signal to control the state of the discharge module 150. Illustratively, the second inverting unit 170 is illustratively shown in fig. 11 as including a second inverter 171. When the response module 140 includes the switching transistor M1, the discharge module 150 includes the first transistor T1, and the types of the switching transistor M1 and the first transistor T1 are the same, the first control signal is inverted by the second inverting unit 170 and then transmitted to the control electrode of the switching transistor M1 to control the state of the switching transistor M1, and meanwhile, the first control signal is inverted by the second inverting unit 170 and the first inverting unit 160 twice and then used as the second control signal to control the state of the first transistor T1, so that when the types of the switching transistor M1 and the first transistor T1 are the same, the first control signal can control the states of the switching transistor M1 and the first transistor T1 to be opposite at the same time through the inverting unit.
Fig. 12 is a schematic diagram of another low dropout linear voltage regulator circuit according to an embodiment of the present invention. As shown in fig. 12, the input module 110 includes a voltage dividing circuit 111, and the output module 120 includes an output switching tube M2; the first input end of the voltage dividing circuit 111 is used as an input end IN of the low dropout linear voltage stabilizing circuit, the second input end of the voltage dividing circuit 111 is connected with the second potential input end V2, the output end of the voltage dividing circuit 111 is connected with the control electrode of the output switching tube M2, the first electrode of the output switching tube M2 is connected with the input voltage VIN, and the second electrode of the output switching tube M2 is used as an output end OUT of the low dropout linear voltage stabilizing circuit.
Specifically, the voltage dividing circuit 111 has a voltage dividing function. The voltage dividing circuit 111 is exemplarily shown in fig. 12 to include a voltage dividing resistor R1, a first voltage stabilizing capacitor Ct1, and a first voltage stabilizing tube D1, and the second potential input terminal V2 may be a ground terminal GND. The first end of the voltage dividing resistor R1 is used as the input end IN of the low dropout linear voltage regulator circuit and is connected to the input voltage VIN, and the second end of the voltage dividing resistor R1 is connected to the first pole of the first voltage stabilizing capacitor Ct1 and is used as the output end of the voltage dividing circuit 111. The second pole of the first voltage stabilizing capacitor Ct1 is connected to the second potential input terminal V2, i.e. the second pole of the first voltage stabilizing capacitor Ct1 is connected to the ground terminal GND. The anode of the first voltage stabilizing tube D1 is connected with the second potential input end V2, namely, the anode of the first voltage stabilizing tube D1 is connected with the ground end GND, and the cathode is connected with the second end of the voltage dividing resistor R1. The voltage dividing resistor R1 and the first voltage stabilizing capacitor Ct1 divide the input voltage, then the voltage is stabilized through the first voltage stabilizing tube D1, and the voltage is output to the control electrode of the output switching tube M2, so that the state of the output switching tube M2 is controlled. When the output switching tube M2 is turned on, the output switching tube M2 subtracts the self-turn-on voltage drop from the input voltage VIN connected to the first pole and outputs the subtracted voltage drop through the second pole, and the subtracted voltage drop is used as the voltage signal vdd of the low dropout linear voltage stabilizing circuit.
In addition, with continued reference to fig. 12, the output module 120 may further include a second voltage stabilizing capacitor Ct2, where a first pole of the second voltage stabilizing capacitor Ct2 is connected to a second pole of the output switching tube M2, and the second pole of the second voltage stabilizing capacitor Ct2 is connected to the ground GND, and by setting the second voltage stabilizing capacitor Ct2, a fixed potential can be provided for the second pole of the output switching tube M2, so as to avoid the second pole potential of the output switching tube M2 from floating.
With continued reference to fig. 12, the output module 120 may further include a second voltage stabilizing tube D2, where an anode of the second voltage stabilizing tube D2 is connected to the ground GND, and a cathode of the second voltage stabilizing tube D2 is connected to the second pole of the output switching tube M2, for stabilizing the voltage signal vdd output by the second pole of the output switching tube M2.
With continued reference to fig. 12, the low dropout linear voltage regulator circuit further includes a filter circuit 180, where the filter circuit 180 is connected between the input module 110 and the output module 120, and is configured to filter the divided voltage signal provided by the input module 110 and output the filtered divided voltage signal to the output module 120, so as to reduce an influence of an interference signal on a gate potential of the output module 120, and improve reliability of the divided voltage signal controlling the output module 120.
Illustratively, the filter circuit 180 includes a filter resistor R2 and a filter capacitor Ct3, the filter resistor R2 is connected in series between the voltage dividing circuit 111 and the output module 120, a first pole of the filter capacitor Ct3 is connected to the ground GND, and a second pole of the filter capacitor Ct3 is connected to the voltage dividing circuit 111. The filter resistor R2 and the filter capacitor Ct3 form a resistance-capacitance filter circuit for filtering the voltage division signal.
The embodiment of the invention also provides a buck circuit. Fig. 13 is a schematic structural diagram of a buck circuit according to an embodiment of the present invention. As shown in fig. 13, the buck circuit includes a low dropout linear regulator circuit Pre-ldo according to any of the embodiments of the present invention.
Specifically, the buck circuit may include a clock generator, a current sensing and compensating module, an error amplifier, a comparator, a pulse width modulator, a zero point detector, an HS drive, an LS drive, and the like, where the voltages vdd of the clock generator, the error amplifier, the comparator, the pulse width modulator, the zero point detector, and the LS drive are the voltage signals vdd provided by the low dropout linear regulator circuit according to any embodiment of the present invention. Because the buck circuit comprises the low dropout linear voltage regulator circuit Pre-ldo provided by any embodiment of the present invention, the buck circuit has the beneficial effects of the low dropout linear voltage regulator circuit Pre-ldo provided by any embodiment of the present invention, and details are not repeated here.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. The low-dropout linear voltage stabilizing circuit is characterized by comprising an input module, an output module, a coupling module and a response module;
the input module is used for converting input voltage into first voltage, the output module is connected with the input module, and the output module is used for outputting a voltage signal according to the first voltage; the coupling module is connected with the output module and is used for coupling the voltage signals; the control end of the response module is connected with the first control signal input end, the first end of the response module is connected with the first signal input end and the coupling module, the first control signal input by the first control signal input end and the first signal provided by the first signal input end are used for controlling the response module to be conducted, and the response module is used for responding the coupled voltage signal and outputting response current; the output module is connected with the response module and is used for adjusting the voltage signal according to the response current.
2. The low dropout linear voltage regulator circuit according to claim 1, wherein said response module includes a switching transistor and a current mirror;
the control electrode of the switching transistor is connected with the first control signal input end, the first electrode of the switching transistor is connected with the first signal input end and the coupling module, the second electrode of the switching transistor is connected with the input end of the current mirror, and the output end of the current mirror is connected with the output module.
3. The low dropout linear voltage regulator circuit according to claim 1 or 2, further comprising a discharge module, wherein a control terminal of the discharge module is connected to the second control signal input terminal, a first terminal of the discharge module is connected to the first potential input terminal, and a second terminal of the discharge module is connected to the coupling module; the state of the discharging module is controlled by the first control signal and the second control signal input by the second control signal input end to be opposite to the state of the response module.
4. The low dropout linear voltage regulator circuit according to claim 3, wherein said discharge module includes a first transistor; the control electrode of the first transistor is connected with the second control signal input end, the first electrode of the first transistor is connected with the first potential input end, and the second electrode of the first transistor is connected with the coupling module.
5. The low dropout linear regulator circuit according to claim 4, wherein said first control signal input is multiplexed to said second control signal input, and wherein said response module includes a switching transistor of a type opposite to a type of said first transistor.
6. The low dropout linear regulator circuit according to claim 4, further comprising a first inverting unit; the first inverting unit comprises an odd number of first inverters connected in series; the input end of the first inverting unit is connected with the first control signal input end, the output end of the first inverting unit is used as the second control signal input end, and when the response module comprises a switching transistor, the type of the switching transistor is the same as the type of the first transistor.
7. The low dropout linear voltage regulator circuit according to claim 6, further comprising a second inverting unit including an odd number of second inverters connected in series; the input end of the second inverting unit is connected with the first control signal input end, and the output end of the second inverting unit is connected with the control end of the response module and the input end of the first inverting unit.
8. The low dropout linear regulator circuit according to claim 1, wherein said coupling module comprises a coupling capacitor; the first pole of the coupling capacitor is connected with the output module, and the second pole of the coupling capacitor is connected with the response module.
9. The low dropout linear voltage regulator circuit according to claim 1, wherein said input module comprises a voltage divider circuit and said output module comprises an output switching tube;
the first input end of the voltage dividing circuit is used as the input end of the low-dropout linear voltage stabilizing circuit, the second input end of the voltage dividing circuit is connected with the second potential input end, the output end of the voltage dividing circuit is connected with the control electrode of the output switching tube, the first electrode of the output switching tube is connected with the input voltage, and the second electrode of the output switching tube is used as the output end of the low-dropout linear voltage stabilizing circuit.
10. A buck circuit comprising a low dropout linear regulator circuit according to any one of claims 1 to 9.
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| CN202310437291.XA CN116166083B (en) | 2023-04-23 | 2023-04-23 | Low dropout linear voltage stabilizing circuit and buck circuit |
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| CN116166083B (en) | 2023-07-21 |
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