CN105099184B - A kind of underload switch power supply chip - Google Patents
A kind of underload switch power supply chip Download PDFInfo
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- CN105099184B CN105099184B CN201410156056.6A CN201410156056A CN105099184B CN 105099184 B CN105099184 B CN 105099184B CN 201410156056 A CN201410156056 A CN 201410156056A CN 105099184 B CN105099184 B CN 105099184B
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Abstract
The invention discloses a kind of underload switch power supply chip, it is related to electric field.Switch between output end and power end and the earth terminal connection for the compensation signal control underload switch power supply chip that the present invention is exported by compensation control circuit, input to the clock signal of switch module and determine the switching frequency of underload switch power supply chip, realizing, which reduces the frequency switched, uprises the efficiency of underloading, so as to reach the purpose that voltage ripple becomes big.When the clock signal of clock generating unit output is rising edge, the output end connection power end of underload switch power supply chip；When the electric current that current detecting branch road is detected between power end and output end is more than the current value of setting, second compensation signal control compensation control circuit of current detecting branch road output, the thermal compensation signal for exporting compensation control circuit makes output end be connected with earth terminal, until next clock signal, going round and beginning again to circulate.
Description
Technical field
The present invention relates to a kind of Switching Power Supply, more particularly to a kind of efficient Switching Power Supply of underloading.
Background technology
Switching Power Supply is widely used in mobile phone, tablet personal computer and digital camera etc. respectively as important power management class circuit
In class portable product.For linear voltage regulator, Switching Power Supply managing chip, such as dc-dc, maximum advantage
It is exactly efficiency high.And in portable use, DC-DC height of efficiency under light load has been largely fixed portable production
The stand-by time of strain system.Therefore, in recent years, low-power consumption, efficient it is designed to grinding for numerous portable uses
Study carefully one of focus.
The power consumption of Switching Power Supply is typically by conduction loss, the quiescent dissipation three of switching loss and chip internal analog circuit
Part forms.
Conduction loss is mainly that electric current flows through the energy that the conducting resistance of power tube is consumed, with the increasing of chip load current
Increase greatly；
The moment of switching loss conducting has the loss of charge or discharge, and determines triangular wave caused by inducing current in electrical equipment
The loss of resistance is produced on part, the formula that Switching Power Supply meets in conducting is：VDD·D=VOUT；
Wherein, VDD is input power, and D is dutycycle, VOUTFor output voltage；
Quiescent dissipation is the consumption of chip internal analog circuit at work.
Wherein, switching loss and quiescent dissipation are unrelated with chip load current size.So chip is led in heavy duty
Logical loss is dominant loss, and in underloading, and switching loss and quiescent dissipation constitute the dominant loss of converter.Due to portable
Efficiency during formula device standby depends primarily on power consumption of the Switching Power Supply under light load conditions, improves Switching Power Supply and is gently loading
When efficiency, it becomes possible to effectively extend portable set service time of battery.But there is switch frequency in current Switching Power Supply
The problem of rate is high, and light load efficiency is low.
The content of the invention
The problem of there is switching frequency height in the present invention, light load efficiency is low to solve existing Switching Power Supply, so as to provide one
The technical scheme of kind underload switch power supply chip.
A kind of underload switch power supply chip is invented, including：
Switch module, an output end is made under a clock signal and a compensation signal control in being connected with power end and with connecing
Switch between ground terminal connection；
Feedback network, a feedback voltage is connected to the switching device, to form one the according to the feedback voltage
One thermal compensation signal and a feedback signal；
Current detecting branch road, it is connected between the output end and the power end, to detect the power end and institute
State the electric current between output end and form one second thermal compensation signal；
Clock generating unit, the switch module is connected, to generate the clock signal, and according to the second benefit
Repay signal and produce the 3rd thermal compensation signal；
Compensation control circuit, it is connected between the feedback network and the switch module, and the current detecting branch
Between road and the switch module, and between the clock generating unit and the switch module, to according to
First thermal compensation signal, second thermal compensation signal and the 3rd thermal compensation signal generate the thermal compensation signal and exported to described
Switch module.
Preferably, including first detects circuit, the first detection circuit and the feedback network and a underloading
The Enable Pin connection of switching power source chip, is referred to the feedback signal formed according to the feedback network and one first
Voltage and one second reference voltage enable control signal to control the underload switch power supply chip to Enable Pin output one
In work or holding state.
Preferably, including the second detection circuit, the second detection circuit are believed with the feedback network and the clock
The connection of number generation unit；
The second detection circuit refers to the feedback signal formed according to the feedback network and one the 3rd
Voltage controls the clock generating unit to generate the high-frequency clock signal or the low-frequency clock of generation
Signal, and/or
The second detection circuit refers to the feedback signal formed according to the feedback network and one the 4th
Voltage forms an overload signal.
Preferably, including overload protecting circuit, the overload protecting circuit are examined with the feedback network and described second
Slowdown monitoring circuit connects, the institute that the overload signal to be formed according to the described second detection circuit controls the feedback network to export
The first thermal compensation signal is stated between being grounded and connecting the compensation control circuit to switch.
Preferably, in addition to enabled control circuit, the enabled control circuit refer to according to an enable signal and one the 5th
Voltage controls the underload switch power supply chip to be in work or holding state.
Preferably, the switch module includes：
Rest-set flip-flop, the S ends of the rest-set flip-flop connect the clock generating unit, the R ends of the rest-set flip-flop
The compensation control circuit is connected, the first output signal and the second output are generated according to the thermal compensation signal and the clock signal
Signal；
First buffer, first buffer include the control terminal of one first buffer, the first of one first buffer
The output end of input, the second input of one first buffer and one first buffer, the control terminal of first buffer
The Q ends of the rest-set flip-flop are connected, the first input end of first buffer connects a drive end, first buffer
Second input connects the output end, to form the first control signal according to first output signal；
First switch, it is connected between the power end and the output end, the first switch includes a first switch
Control terminal, the control terminal of the first switch connects the output end of first buffer, according to first control signal
To control the shut-off of the first switch；
Second buffer, shown second buffer include the control terminal of one second buffer and the output of one second buffer
End, the control terminal of second buffer connect the Q ends of the rest-set flip-flop, to form the according to second output signal
Two control signals；
Second switch, it is connected between the earth terminal and the output end, the second switch includes a second switch
Control terminal, the control terminal of the second switch connects the output end of second buffer, according to second control signal
To control the shut-off of the second switch.
Preferably, the feedback network includes：
Error amplifier, the in-phase input end of the error amplifier connect the feedback voltage, the error amplifier
Inverting input connect one the 6th reference voltage, the first thermal compensation signal of error amplifier output to the compensation control
Circuit.
Preferably, the current detecting branch road includes：
Current sense amplifier, the in-phase input end of the current sense amplifier connect the power end, the electric current
The inverting input of detection amplifier is connected between the power end and the output end, the current sense amplifier output
The second thermal compensation signal to the compensation control circuit and the clock generating unit；
One resistance R1 is parallel between the in-phase input end and inverting input of the current sense amplifier.
Preferably, the compensation control circuit includes：
First comparator, the in-phase input end of the first comparator connect second thermal compensation signal, and described first compares
The inverting input of device connects one the 7th reference voltage；
Second comparator, the in-phase input end of second comparator connect the 3rd thermal compensation signal, and described second compares
The anti-phase input of device terminates first thermal compensation signal；
OR gate, the first input end of the OR gate connect the output end of the first comparator, and the second of the OR gate is defeated
Enter the output end that end connects second comparator, the thermal compensation signal that the OR gate exports to the switch module.
Preferably, the first detection circuit includes：
3rd comparator, the homophase input of the 3rd comparator terminate the feedback signal, the 3rd comparator
Inverting input connects first reference voltage, and the output end of the 3rd comparator exports the enabled control signal；
4th comparator, the homophase input of the 4th comparator terminate the feedback signal, the 4th comparator
Inverting input connects second reference voltage, and the output end of the 4th comparator exports the enabled control signal.
Preferably, the second detection circuit includes：
5th comparator, the in-phase input end of the 5th comparator connect the feedback signal, the 5th comparator
Inverting input connect the 4th reference voltage, the 5th comparator output terminal exports the overload signal,
6th comparator, the in-phase input end of the 6th comparator connect the feedback signal, the 6th comparator
Inverting input connect the 3rd reference voltage, it is single that the 6th comparator output terminal connects the clock signal generation
Member.
Preferably, the enabled control circuit includes：
Comparator is closed, the in-phase input end for closing comparator connects the enable signal, the closing comparator
Anti-phase input terminate the 5th reference voltage；
NMOS tube, the grid of the NMOS tube connect closing comparator output terminal, and the source electrode of the NMOS tube connects the ground connection
End, between the NMOS tube drain electrode connection and the feedback network and the compensation control circuit.
Beneficial effects of the present invention：
The present invention changes the ripple of voltage by compensation control circuit, when power supply chip output end actual current is more than setting
Load resistance electric current when, unnecessary electric current gives electric capacity charging, and ripple becomes big, output voltage rise, so as to produce output electricity
The ripple of pressure, now power end be connected with output end, the electric current of load resistance is smaller, first switch be in closure state when
Between it is longer, reduce switching frequency.By the output end of the described second detection circuit realiration switch module in power end with connecing
Switching between ground terminal, so as to improve light load efficiency.
Brief description of the drawings
Fig. 1 is a kind of underload switch power supply chip block diagram of the present invention；
Fig. 2 is a kind of internal circuit diagram of underload switch power supply chip of the present invention.
Fig. 3 is a kind of underload switch power supply chip peripheral circuit diagram of the present invention.
In accompanying drawing：1. the second detection circuit；11. the 5th comparator；12. the 6th comparator；2. clock generating unit；
3. the first detection circuit；31. the 3rd comparator；32. the 4th comparator；4. overload protecting circuit；5. current detecting branch road；It is 6. anti-
Present network；7. compensation control circuit；71. first comparator；72. the second comparator；73. OR gate；8. switch module；81.RS is touched
Send out device；82. the first buffer；83. first switch；84. the second buffer；85. second switch；9. enabled control circuit；91. close
Close comparator；92.NMOS is managed.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
As depicted in figs. 1 and 2, there is provided a kind of underload switch power supply chip, including：
Switch module 8, an output end SW is set to connect in power end IN under a clock signal clk and a compensation signal control
Connect and switch between being connected with earth terminal GND；
Feedback network 6, a feedback voltage FB is connected to switching device, mended to form one first according to feedback voltage FB
Repay signal and a feedback signal；
Current detecting branch road 5, it is connected between output end SW and power end IN, to detect power end IN and output end SW
Between electric current and formed one second thermal compensation signal；
Clock generating unit 2, connecting valve component 8, to generate clock signal clk, and according to the second compensation
Signal produces the 3rd thermal compensation signal；
Compensation control circuit 7, it is connected between feedback network 6 and switch module 8, and current detecting branch road 5 and switch
Between component 8, and between clock generating unit 2 and switch module 8, to according to the first thermal compensation signal, the second compensation
Signal and the 3rd thermal compensation signal generation thermal compensation signal are simultaneously exported to switch module 8.
In the present embodiment, between the output end SW and power end IN of underload switch power supply chip and earth terminal GND connections
Switching is that the thermal compensation signal exported by compensation control circuit 7 is realized, is inputted to the clock signal clk decision of switch module 8
The switching frequency of underload switch power supply chip, realizing, which reduces the frequency of switch, uprises the efficiency of underloading, so as to reach electricity
Emboss the purpose that ripple becomes big.
When the clock signal clk that clock generating unit 2 exports is rising edge, the output of underload switch power supply chip
Hold SW connection power ends IN；Electric current between current detecting branch road 5 detects power end IN and output end SW is more than the electricity of setting
During flow valuve, the second compensation signal control compensation control circuit 7 of the output of current detecting branch road 5, make what compensation control circuit 7 exported
Thermal compensation signal makes output end SW be connected with earth terminal GND, and until next clock signal, going round and beginning again to circulate.
Switch module 8 in the present embodiment includes：Rest-set flip-flop 81, the first buffer 82, first switch 83, second are slow
Device 84 and second switch 85 are rushed,
Rest-set flip-flop 81 connects compensation control circuit 7 and clock generating unit 2, according to thermal compensation signal and clock signal
CLK generates the first output signal and the second output signal；
First buffer 82 is connected between rest-set flip-flop 81, drive end BOOT and output end SW, to defeated according to first
Go out signal and form the first control signal；
First switch 83 is connected between the first buffer 82, power end IN and output end SW, according to the first control signal
With the break-make between control output end SW and power end IN；
Second buffer 84 is connected between rest-set flip-flop 81, earth terminal GND and output end SW, to according to the second output
Signal forms the second control signal；
Second switch 85 is connected between the second buffer 84, earth terminal GND and output end SW, according to the second control signal
With the break-make between control output end SW and earth terminal GND；
Diode D positive pole connects 5V voltages, and diode D negative pole meets drive end BOOT.
Feedback network 6 in the present embodiment includes：Error amplifier；
The in-phase input end connection feedback voltage FB of error amplifier, the inverting input connection one the 6th of error amplifier
Reference voltage, the first thermal compensation signal that error amplifier exports to compensation control circuit 7.
Current detecting branch road 5 in the present embodiment includes：Current sense amplifier and resistance R1；
The in-phase input end connection power end IN of current sense amplifier, the inverting input connection of current sense amplifier
Between power end IN and output end SW, current sense amplifier output the second thermal compensation signal to compensation control circuit 7 and when
Clock signal generation unit 2；
Resistance R1 is parallel between the in-phase input end of current sense amplifier and inverting input.
Compensation control circuit 7 in the present embodiment includes：First comparator 71, the second comparator 72 and OR gate 73；
The in-phase input end of first comparator 71 connects the second thermal compensation signal, the inverting input connection one of first comparator 71
7th reference voltage；
The in-phase input end of second comparator 72 connects the 3rd thermal compensation signal, the anti-phase input termination first of the second comparator 72
Thermal compensation signal；
The output end of the first input end connection first comparator 71 of OR gate 73, the second input connection second of OR gate 73
The output end of comparator 72, the thermal compensation signal that OR gate 73 exports to switch module 8.
With reference to shown in Fig. 2 and Fig. 3, first comparator 71 changes the ripple of output voltage, when underload switch power supply chip
When actual current is more than the load resistance R2 set in underload switch power supply chip peripheral circuit electric current, unnecessary electric current is to electricity
Feel L chargings, ripple becomes big, and output voltage rise, so as to produce the ripple of output voltage, now first switch 83, which is constantly in, closes
Conjunction state（That is, it is provided with minimum output current threshold）, load resistance R2 electric currents are smaller, and first switch 83 is in closure
State time it is longer, reduce switching frequency.
The break-make of the underload switch power supply chip is realized by the second comparator 72 of pulsed drive in the present embodiment
, the switching frequency of power supply chip is fixed under normal circumstances, inputs to the clock signal clk of switch module 8 and determines electricity
The switching frequency of source chip, the second comparator 72 determine when first switch 83 disconnects,（I.e. the second comparator 72 determines
The length for the time that first switch 83 turns off）The efficiency of underloading uprises needs and frequency is reduced, and voltage ripple can become big；At that time
When the clock signal clk that clock signal generation unit 2 exports is rising edge, the upset of rest-set flip-flop 81 turns on first switch 83, the
The shut-off of two switch 85；(output of power supply chip is flowed to when the output current of first switch 83 rises from the input IN of power supply chip
Hold SW), until the output current of first switch 83 is more than the current value of setting, the upset of first comparator 71 exports high level, hereafter
The ON time of first switch 83 is determined by error amplifier and the second comparator 72, is caused when the output current of first switch 83 rises
The upset output of second comparator 72 is high level, and the upset of rest-set flip-flop 81 turns off first switch 83, and second switch 85 turns on.Directly
To next clock signal, going round and beginning again to circulate.
As a kind of preferred embodiment of the present invention, including the first detection circuit 3, the first detection circuit 3 and feedback net
The Enable Pin connection of the underload switch power supply chip of network 6 and one, to the feedback signal formed according to feedback network 6 and one the
One reference voltage and one second reference voltage enable control signal to control at underload switch power supply chip to Enable Pin output one
In work or holding state.
With reference to shown in Fig. 2 and Fig. 3, underload switch power supply chip is realized by the first detection circuit 3 in the present embodiment
Output end SW and power end IN and earth terminal GND connections between switch, when feedback signal is more than the first reference voltage, underloading
The output end SW of switching power source chip is connected with earth terminal GND, and the inductance L in underload switch power supply chip peripheral circuit, which enters, to be put
Electricity condition；When feedback signal is less than the second reference voltage, the output end SW of underload switch power supply chip is connected with power end IN,
Inductance L enters charged state.
The first detection circuit 3 in the present embodiment includes：3rd comparator 31 and the 4th comparator 32,
The in-phase input end connection feedback signal of 3rd comparator 31, the inverting input connection first of the 3rd comparator 31
Reference voltage, the enabled control signal of output end output of the 3rd comparator 31；
The in-phase input end connection feedback signal of 4th comparator 32, the inverting input connection second of the 4th comparator 32
Reference voltage, the enabled control signal of output end output of the 4th comparator 32.
In the present embodiment, when load needs electric current smaller (light-load mode)：When clock generating unit 2 exports
Clock signal CLK is after rising edge, the output of the second comparator 72 is that high level can be high electricity prior to the upset output of first comparator 71
Flat, now first switch 83 is still turned on until the comparator of first comparator 71 is overturn so that the electric current of output is more than load institute
The circuit needed, therefore feedback voltage FB rises；By several cycles, feedback voltage FB rises above the first reference voltage,
3rd comparator 31 upset output high level, power supply chip enter park mode (sleep), make Q=0 of rest-set flip-flop 81,Now in addition to the 3rd comparator 31 and the 4th comparator 32, other circuits are stopped, and first switch 83 and second is opened
85 are closed to be turned off；In the presence of load current, feedback voltage FB declines, when feedback voltage FB drops to less than second with reference to electricity
During pressure, the 4th comparator 32 upset output high level, power supply chip reenters mode of operation (work), makes rest-set flip-flop 81
Q=1,First switch 83 turns on, and second switch 85 turns off.If load circuit is still smaller, sleep → work →
Sleep → work ..., circulate again and again.Because in sleep patterns, chip quiescent current is small, while first switch 83
There is no switching motion with second switch 85, so reduce the internal power consumption of chip itself, conversion during so as to improve underloading
Efficiency.
As a kind of preferred embodiment of the present invention, including the second detection circuit 1, the second detection circuit 1 and feedback net
Network 6 and clock generating unit 2 connect；
When second detection circuit 1 controls to the feedback signal formed according to feedback network 6 and one the 3rd reference voltage
Clock signal generation unit 2 generates high-frequency clock signal clk or the low-frequency clock signal clk of generation, and/or
Second detection circuit 1 forms one to the feedback signal formed according to feedback network 6 and one the 4th reference voltage
Overload signal OVP.
As a kind of preferred embodiment of the present invention, including overload protecting circuit 4, overload protecting circuit 4 and feedback net
Network 6 and second detects circuit 1 and connected, and the overload signal OVP to be formed according to the second detection circuit 1 controls feedback network 6
First thermal compensation signal of output switches between being grounded and connecting compensation control circuit 7.
As a kind of preferred embodiment of the present invention, in addition to enabled control circuit 9, control circuit 9 is enabled according to one
Enable signal and one the 5th reference voltage control underload switch power supply chip are in work or holding state.
As a kind of preferred embodiment of the present invention, the second detection circuit 1 includes：5th comparator 11 and the 6th compares
Device 12；
The in-phase input end connection feedback signal of 5th comparator 11, the inverting input connection the 4th of the 5th comparator 11
Reference voltage, the output end output overloading signal OVP of the 5th comparator 11,
The in-phase input end connection feedback signal of 6th comparator 12, the inverting input connection the 3rd of the 6th comparator 12
Reference voltage, the output end of the 6th comparator 12 connection clock generating unit 2.
As a kind of preferred embodiment of the present invention, enabled control circuit 9 includes：Close comparator 91 and NMOS tube
92；
The in-phase input end connection enable signal EN of comparator 91 is closed, closes the inverting input connection the of comparator 91
Five reference voltages；
The grid of NMOS tube 92, which connects, closes the output end of comparator 91, and the source electrode of NMOS tube 92 connects earth terminal GND, NMOS tube 92
Between drain electrode connection and feedback network 6 and compensation control circuit 7.
When enable signal EN is more than five reference voltages, closes the output low level control of comparator 91 NMOS tube 92 and lead
It is logical, the output signal of error amplifier is grounded, power supply chip is entered park mode；When enable signal EN is less than the 5th reference
During voltage, close the output high level control NMOS tube 92 of comparator 91 and end, make error amplifier outputs signal to compensation control
Circuit 7 processed, power supply chip is set to enter mode of operation.
As a kind of preferred embodiment of the present invention, the present embodiment is illustrated by taking one group of reference voltage as an example：First
Reference voltage is 0.808V, and the second reference voltage is 0.796V, and the 3rd reference voltage is 0.3V, and the 4th reference voltage is 0.88V,
5th reference voltage is 1.3V, and the 6th reference voltage is 0.8V, and the 7th reference voltage is 0.05V.
Involved on-off circuit is only a kind of topological diagram of on-off circuit in above-described embodiment, and the present invention is applied to all
In on-off circuit, wherein first switch 83 and second switch 85 can be metal-oxide-semiconductor, triode, diode or rectifying tube etc..
Preferred embodiments of the present invention are the foregoing is only, not thereby limit embodiments of the present invention and protection model
Enclose, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Scheme obtained by equivalent substitution and obvious change, should be included in protection scope of the present invention.
Claims (9)
- A kind of 1. underload switch power supply chip, it is characterised in that including：Switch module, an output end is made under a clock signal and a compensation signal control in being connected with power end and and earth terminal Switch between connection；Feedback network, a feedback voltage is connected to the switch module, mended to form one first according to the feedback voltage Repay signal and a feedback signal；Current detecting branch road, be connected between the output end and the power end, to detect the power end with it is described defeated The electric current and one second thermal compensation signal of formation gone out between end；Clock generating unit, the switch module is connected, to generate the clock signal, and according to the second compensation letter Number production the 3rd thermal compensation signal；Compensation control circuit, be connected between the feedback network and the switch module, and the current detecting branch road with Between the switch module, and between the clock generating unit and the switch module, to according to described first Thermal compensation signal, second thermal compensation signal and the 3rd thermal compensation signal generate the thermal compensation signal and exported to the switch Component；The compensation control circuit includes：First comparator, the in-phase input end of the first comparator connect second thermal compensation signal, the first comparator Inverting input connects one the 7th reference voltage；Second comparator, the in-phase input end of second comparator connect the 3rd thermal compensation signal, second comparator Anti-phase input terminates first thermal compensation signal；OR gate, the first input end of the OR gate connect the output end of the first comparator, the second input of the OR gate Connect the output end of second comparator, the thermal compensation signal that the OR gate exports to the switch module；Including the first detection circuit, the first detection circuit and the feedback network and a underload switch power supply chip Enable Pin connection, to the feedback signal formed according to the feedback network and one first reference voltage and one second Reference voltage to one enabled control signal of Enable Pin output with control the underload switch power supply chip be in work or Holding state；The first detection circuit includes：3rd comparator, the homophase input of the 3rd comparator terminate the feedback signal, the 3rd comparator it is anti-phase Input connects first reference voltage, and the output end of the 3rd comparator exports the enabled control signal；4th comparator, the anti-phase input of the 4th comparator terminate the feedback signal, the same phase of the 4th comparator Input connects second reference voltage, and the output end of the 4th comparator exports the enabled control signal；During light-load mode, the clock signal of the clock generating unit output is after rising edge, described second compares It is high level that device, which exports high level prior to first comparator upset output, the output end turned on the power end until The first comparator upset so that the electric current of output is more than the electric current needed for load, and the feedback voltage rises, and process is some Individual cycle, the feedback voltage rise above first reference voltage, the 3rd comparator upset output high level, electricity Source chip enters park mode, and now in addition to the 3rd comparator and the 4th comparator, other circuits are stopped；In the presence of load current, the feedback signal declines, when the feedback signal drops to less than second reference During voltage, the 4th comparator upset output high level, power supply chip reenters mode of operation.
- 2. underload switch power supply chip as claimed in claim 1, it is characterised in that including the second detection circuit, second inspection Slowdown monitoring circuit is connected with the feedback network and the clock generating unit；The second detection circuit is to the feedback signal formed according to the feedback network and one the 3rd reference voltage The clock generating unit is controlled to generate the high-frequency clock signal or the low-frequency clock signal of generation, And/orThe second detection circuit is to the feedback signal formed according to the feedback network and one the 4th reference voltage Form an overload signal.
- 3. underload switch power supply chip as claimed in claim 2, it is characterised in that including overload protecting circuit, the overload is protected Protection circuit is connected with the feedback network and the second detection circuit, to the institute formed according to the described second detection circuit Stating overload signal controls first thermal compensation signal of the feedback network output electric in being grounded and connecting the compensation control Switch between road.
- 4. underload switch power supply chip as claimed in claim 1, it is characterised in that also include enabled control circuit, it is described enabled Control circuit controls the underload switch power supply chip to be in work or treat according to an enable signal and one the 5th reference voltage Machine state.
- 5. underload switch power supply chip as claimed in claim 1, it is characterised in that the switch module includes：Rest-set flip-flop, the S ends of the rest-set flip-flop connect the clock generating unit, the R ends connection of the rest-set flip-flop The compensation control circuit, the first output signal is generated according to the thermal compensation signal and the clock signal and the second output is believed Number；First buffer, first buffer include the first input of the control terminal of one first buffer, one first buffer The output end at end, the second input of one first buffer and one first buffer, the control terminal connection of first buffer The Q ends of the rest-set flip-flop, first input end one drive end of connection of first buffer, the second of first buffer Input connects the output end, to form the first control signal according to first output signal；First switch, it is connected between the power end and the output end, the first switch includes the control of a first switch End processed, the control terminal of the first switch connect the output end of first buffer, according to first control signal to control Make the shut-off of the first switch；Second buffer, shown second buffer include the control terminal of one second buffer and the output end of one second buffer, The control terminal of second buffer connects the rest-set flip-flopEnd, to form second according to second output signal Control signal；Second switch, it is connected between the earth terminal and the output end, the second switch includes the control of a second switch End processed, the control terminal of the second switch connect the output end of second buffer, according to second control signal to control Make the shut-off of the second switch.
- 6. underload switch power supply chip as claimed in claim 1, it is characterised in that the feedback network includes：Error amplifier, The inverting input of the error amplifier connects the feedback voltage, the in-phase input end connection 1 of the error amplifier the Six reference voltages, the first thermal compensation signal that the error amplifier exports to the compensation control circuit.
- 7. underload switch power supply chip as claimed in claim 1, it is characterised in that the current detecting branch road includes：Electric current is examined Amplifier, the in-phase input end of the current sense amplifier connect the power end, the current sense amplifier it is anti- Phase input is connected between the power end and the output end, the second thermal compensation signal of the current sense amplifier output To the compensation control circuit and the clock generating unit；One resistance R1 is parallel between the in-phase input end and inverting input of the current sense amplifier.
- 8. underload switch power supply chip as claimed in claim 2, it is characterised in that the second detection circuit includes：5th comparator, the in-phase input end of the 5th comparator connect the feedback signal, the 5th comparator it is anti- Phase input connects the 4th reference voltage, and the 5th comparator output terminal exports the overload signal,6th comparator, the homophase input of the 6th comparator terminate the feedback signal, the 6th comparator it is anti-phase Input connects the 3rd reference voltage, and the 6th comparator output terminal connects the clock generating unit.
- 9. underload switch power supply chip as claimed in claim 4, it is characterised in that the enabled control circuit includes：Comparator is closed, the inverting input for closing comparator connects the enable signal, described to close the same of comparator Phase input connects the 5th reference voltage；NMOS tube, the grid of the NMOS tube connect closing comparator output terminal, and the source electrode of the NMOS tube meets the earth terminal, institute State between NMOS tube drain electrode connection and the feedback network and the compensation control circuit.
Priority Applications (1)
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| CN105553260B (en) * | 2016-01-26 | 2018-04-24 | 昆山龙腾光电有限公司 | A kind of program-controlled voltage adjustment circuit |
| CN107834840A (en) * | 2017-11-06 | 2018-03-23 | 上海斐讯数据通信技术有限公司 | Feedback regulation switching frequency solves circuit structure and its method that inductance is uttered long and high-pitched sounds |
| CN108390557B (en) * | 2018-02-28 | 2019-08-13 | 深圳市恒浩伟业科技有限公司 | Improve the Switching Power Supply of underloading frequency |
| CN109217663B (en) * | 2018-09-14 | 2024-06-18 | 郑州云海信息技术有限公司 | Method and system for optimally designing microplate power supply compensation of storage system |
| CN110782565A (en) * | 2019-11-07 | 2020-02-11 | 上海庆科信息技术有限公司 | Wireless identification fingerprint device and intelligent lock equipment |
| CN114079377B (en) * | 2020-08-19 | 2024-02-06 | 圣邦微电子（北京）股份有限公司 | Power converter and control circuit and control method thereof |
| CN114924109B (en) * | 2022-07-20 | 2022-11-29 | 深圳市英特瑞半导体科技有限公司 | Method, circuit and device for testing low-power chip current |
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