CN117950439A - Feedback circuit for control chip - Google Patents
Feedback circuit for control chip Download PDFInfo
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- CN117950439A CN117950439A CN202410062877.7A CN202410062877A CN117950439A CN 117950439 A CN117950439 A CN 117950439A CN 202410062877 A CN202410062877 A CN 202410062877A CN 117950439 A CN117950439 A CN 117950439A
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- 230000003321 amplification Effects 0.000 claims abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 48
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 1
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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
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- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
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- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The present invention relates to the field of electronic circuit design, and in particular, to a feedback circuit for a control chip. The ninth resistor, the tenth resistor and the feedback compensation circuit determine the output voltage of the voltage output end, wherein when the voltage is normally output, the third resistor and the second resistor which are electrically connected with the triode are properly adjusted to enable the triode to work in a linear region. When the circuit works, the fourth resistor and the fifth resistor provide steady-state working current for the working state of the three-terminal adjustable shunt reference source, meanwhile, the fourth resistor provides working current for the voltage reference source of the three-terminal adjustable shunt reference source, and during normal working, the current breaks down through the three-terminal adjustable shunt reference source, the three-terminal adjustable shunt reference source provides a reference voltage of 2.5V, and the sixth resistor and the seventh resistor are used for carrying out proportional amplification on the output voltage. The high-precision feedback circuit has stable loop, and greatly improves the output voltage precision, the load adjustment rate and the linear adjustment of the product.
Description
The scheme is a divisional application taking an invention patent with the application date of 2018, 12, 24, the application number of 201811578757.3 and the name of a high-precision feedback circuit as a main application.
Technical Field
The invention relates to the field of electronic circuit design, in particular to a high-precision feedback circuit.
Background
In the current switching power supply products, small volume has become a development trend and chip integration is higher and higher. At present, more and more power supply chip manufacturers integrate a voltage reference source with a control chip, for example, INNO series chips of PI, as shown in fig. 1, when the array chips are applied, output voltage feedback is realized by adding a bias resistor (namely R1 and R2 in fig. 1) to a reference voltage foot FB, but the voltage precision of the reference voltage foot FB is low, generally about 3%, and the precision of the bias resistor is added to the reference voltage foot FB, so that the output voltage precision of the whole product is close to 5%. This is far from sufficient for existing products requiring output voltage accuracy to be controlled within 1%.
Therefore, a high precision feedback circuit is needed to meet the application requirements.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: a high-precision feedback circuit is provided to improve the precision of output voltage and meet the application requirements.
In order to solve the technical problems, the invention adopts a technical scheme that:
A high-precision feedback circuit comprises a control chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a triode and a three-terminal adjustable shunt reference source;
The control chip comprises a reference voltage pin, wherein the reference voltage pin is respectively and electrically connected with one end of a ninth resistor, one end of a tenth resistor and one end of a first resistor, the other end of the ninth resistor is electrically connected with a voltage output end, the other end of the tenth resistor is electrically connected with a grounding end, and the other end of the first resistor is electrically connected with a collector electrode of a triode;
One end of the second resistor, one end of the third resistor, one end of the fourth resistor and one end of the sixth resistor are respectively and electrically connected with the voltage output end, the other end of the second resistor is electrically connected with the emitter of the triode, the other end of the third resistor is respectively and electrically connected with the base of the triode and one end of the fifth resistor, the other end of the fifth resistor, one end of the second capacitor and one end of the eighth resistor are respectively and electrically connected with the cathode of the three-terminal adjustable shunt reference source, the anode of the three-terminal adjustable shunt reference source is electrically connected with the grounding end, the other end of the eighth resistor is electrically connected with one end of the first capacitor, the reference electrode of the three-terminal adjustable shunt reference source is respectively and electrically connected with the other end of the sixth resistor, the other end of the second capacitor, the other end of the first capacitor and one end of the seventh resistor, and the other end of the seventh resistor is electrically connected with the grounding end.
The invention adopts another technical scheme that:
A high-precision feedback circuit comprises a control chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a MOS tube and a three-terminal adjustable shunt reference source;
The control chip comprises a reference voltage pin, wherein the reference voltage pin is respectively and electrically connected with one end of a ninth resistor, one end of a tenth resistor and one end of a first resistor, the other end of the ninth resistor is electrically connected with a voltage output end, the other end of the tenth resistor is electrically connected with a grounding end, and the other end of the first resistor is electrically connected with a source electrode of the MOS tube;
One end of the second resistor, one end of the third resistor, one end of the fourth resistor and one end of the sixth resistor are respectively and electrically connected with the voltage output end, the other end of the second resistor is electrically connected with the drain electrode of the MOS tube, the other end of the third resistor is respectively and electrically connected with the grid electrode of the MOS tube and one end of the fifth resistor, the other end of the fifth resistor, one end of the second capacitor and one end of the eighth resistor are respectively and electrically connected with the cathode of the three-end adjustable shunt reference source, the anode of the three-end adjustable shunt reference source is electrically connected with the grounding end, the other end of the eighth resistor is electrically connected with one end of the first capacitor, the reference electrode of the three-end adjustable shunt reference source is respectively and electrically connected with the other end of the sixth resistor, the other end of the second capacitor, the other end of the first capacitor and one end of the seventh resistor, and the other end of the seventh resistor is electrically connected with the grounding end.
The invention has the beneficial effects that:
The invention provides a high-precision feedback circuit, which is characterized in that the output voltage of a voltage output end is determined by a ninth resistor, a tenth resistor and a feedback compensation circuit, wherein when the voltage is normally output, a third resistor electrically connected with a base electrode of a PNP triode and a second resistor electrically connected with an emitter electrode of the PNP triode are properly adjusted, so that the PNP triode works in a linear region. The first resistor is a current limiting resistor for feedback current. When the circuit works, the fourth resistor and the fifth resistor provide steady-state working current for the working state of the three-terminal adjustable shunt reference source, meanwhile, the fourth resistor provides working current for the voltage reference source of the three-terminal adjustable shunt reference source, and during normal working, the current breaks down through the three-terminal adjustable shunt reference source, the three-terminal adjustable shunt reference source provides a reference voltage of 2.5V, and the sixth resistor and the seventh resistor are used for carrying out proportional amplification on the output voltage. The eighth resistor, the first capacitor and the second capacitor are loop compensation networks of the circuit. Compared with the traditional scheme, the high-precision feedback circuit has stable loop, and greatly improves the output voltage precision, the load adjustment rate and the linear adjustment of the product. In addition, the MOS tube is further used for replacing the PNP triode, so that the precision of the output voltage can be further improved.
Drawings
FIG. 1 is a schematic diagram of a prior art output voltage feedback circuit;
FIG. 2 is a circuit diagram of a first embodiment of a high precision feedback circuit according to the present invention;
FIG. 3 is a circuit diagram of a first embodiment of a high precision feedback circuit according to the present invention;
FIG. 4 is a circuit diagram of a second embodiment of a high precision feedback circuit according to the present invention;
FIG. 5 is a circuit diagram of a second embodiment of a high precision feedback circuit according to the present invention;
description of the reference numerals:
u1, a control chip; FB. A reference voltage pin;
R1, a first resistor; r2, a second resistor; r3, a third resistor; r4, a fourth resistor; r5, a fifth resistor; r6, a sixth resistor; r7, a seventh resistor; r8, eighth resistor; RU, ninth resistance; RL, tenth resistance;
c1, a first capacitor; c2, a second capacitor;
Q1, triode; q2, MOS tube;
U2, three-terminal adjustable shunt reference source; K. a cathode; A. an anode; REF, reference pole;
vout, voltage output;
GND, the ground terminal;
DZ1, diode.
Detailed Description
In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.
It should be noted that: r1 in FIGS. 2-5 is not R1 in FIG. 1, but RU in FIGS. 2-5 is R1 in FIG. 1; r2 in FIGS. 2-5 is not R2 in FIG. 1, but RL in FIGS. 2-5 is R2 in FIG. 1.
Referring to fig. 2 and 3, the high precision feedback circuit provided by the present invention includes a control chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a triode, and a three-terminal adjustable shunt reference source;
The control chip comprises a reference voltage pin, wherein the reference voltage pin is respectively and electrically connected with one end of a ninth resistor, one end of a tenth resistor and one end of a first resistor, the other end of the ninth resistor is electrically connected with a voltage output end, the other end of the tenth resistor is electrically connected with a grounding end, and the other end of the first resistor is electrically connected with a collector electrode of a triode;
One end of the second resistor, one end of the third resistor, one end of the fourth resistor and one end of the sixth resistor are respectively and electrically connected with the voltage output end, the other end of the second resistor is electrically connected with the emitter of the triode, the other end of the third resistor is respectively and electrically connected with the base of the triode and one end of the fifth resistor, the other end of the fifth resistor, one end of the second capacitor and one end of the eighth resistor are respectively and electrically connected with the cathode of the three-terminal adjustable shunt reference source, the anode of the three-terminal adjustable shunt reference source is electrically connected with the grounding end, the other end of the eighth resistor is electrically connected with one end of the first capacitor, the reference electrode of the three-terminal adjustable shunt reference source is respectively and electrically connected with the other end of the sixth resistor, the other end of the second capacitor, the other end of the first capacitor and one end of the seventh resistor, and the other end of the seventh resistor is electrically connected with the grounding end.
From the above description, the beneficial effects of the invention are as follows:
The invention provides a high-precision feedback circuit, which is characterized in that the output voltage of a voltage output end is determined by a ninth resistor, a tenth resistor and a feedback compensation circuit, wherein when the voltage is normally output, a third resistor electrically connected with a base electrode of a PNP triode and a second resistor electrically connected with an emitter electrode of the PNP triode are properly adjusted, so that the PNP triode works in a linear region. The first resistor is a current limiting resistor for feedback current. When the circuit works, the fourth resistor and the fifth resistor provide steady-state working current for the working state of the three-terminal adjustable shunt reference source, meanwhile, the fourth resistor provides working current for the voltage reference source of the three-terminal adjustable shunt reference source, and during normal working, the current breaks down through the three-terminal adjustable shunt reference source, the three-terminal adjustable shunt reference source provides a reference voltage of 2.5V, and the sixth resistor and the seventh resistor are used for carrying out proportional amplification on the output voltage. The eighth resistor, the first capacitor and the second capacitor are loop compensation networks of the circuit. Compared with the traditional scheme, the high-precision feedback circuit has stable loop, and greatly improves the output voltage precision, the load adjustment rate and the linear adjustment of the product.
Further, the voltage regulator further comprises a diode, wherein the other end of the ninth resistor, one end of the second resistor, one end of the third resistor and one end of the fourth resistor are electrically connected with each other and then are electrically connected with the anode of the diode, and the cathode of the diode is electrically connected with the voltage output end.
As can be seen from the above description, the diode is a zener diode, and is designed to protect the TL431 device when designing 36V and above, since the maximum operating voltage of the TL431 is 36V, if no zener is added, the TL431 may break down and break down.
Further, the model of the three-terminal adjustable shunt reference source is TL431.
With continued reference to fig. 4 and fig. 5, the present invention further provides a high precision feedback circuit, which includes a control chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a MOS transistor, and a three-terminal adjustable shunt reference source;
The control chip comprises a reference voltage pin, wherein the reference voltage pin is respectively and electrically connected with one end of a ninth resistor, one end of a tenth resistor and one end of a first resistor, the other end of the ninth resistor is electrically connected with a voltage output end, the other end of the tenth resistor is electrically connected with a grounding end, and the other end of the first resistor is electrically connected with a source electrode of the MOS tube;
One end of the second resistor, one end of the third resistor, one end of the fourth resistor and one end of the sixth resistor are respectively and electrically connected with the voltage output end, the other end of the second resistor is electrically connected with the drain electrode of the MOS tube, the other end of the third resistor is respectively and electrically connected with the grid electrode of the MOS tube and one end of the fifth resistor, the other end of the fifth resistor, one end of the second capacitor and one end of the eighth resistor are respectively and electrically connected with the cathode of the three-end adjustable shunt reference source, the anode of the three-end adjustable shunt reference source is electrically connected with the grounding end, the other end of the eighth resistor is electrically connected with one end of the first capacitor, the reference electrode of the three-end adjustable shunt reference source is respectively and electrically connected with the other end of the sixth resistor, the other end of the second capacitor, the other end of the first capacitor and one end of the seventh resistor, and the other end of the seventh resistor is electrically connected with the grounding end.
From the above description, the beneficial effects of the invention are as follows: further use the MOS pipe to replace PNP triode, also can realize the technical effect that the first scheme alleged, but preferred first scheme because:
The control mechanism of the triode and the MOS tube is different. The triode is a current type control device, the MOS tube is a voltage type control device, the triode can control collector current by controlling base current, the MOS tube is equivalent to a switch in the scheme, and current needs to be controlled by a current limiting resistor, so that the control effect of the MOS tube is slightly poor.
Further, the voltage regulator further comprises a diode, wherein the other end of the ninth resistor, one end of the second resistor, one end of the third resistor and one end of the fourth resistor are electrically connected with each other and then are electrically connected with the anode of the diode, and the cathode of the diode is electrically connected with the voltage output end.
Further, the model of the three-terminal adjustable shunt reference source is TL431.
Referring to fig. 2-3, a first embodiment of the present invention is as follows:
The invention provides a high-precision feedback circuit which comprises a control chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor RU, a tenth resistor RL, a first capacitor C1, a second capacitor C2, a triode Q1 and a three-terminal adjustable shunt reference source U2, wherein the first resistor R1 is connected with the first resistor R2; the model number of the three-terminal adjustable shunt reference source U2 is TL431.
The control chip U1 includes a reference voltage pin FB, where the reference voltage pin FB is electrically connected to one end of a ninth resistor RU, one end of a tenth resistor RL, and one end of a first resistor R1, the other end of the ninth resistor RU is electrically connected to the voltage output terminal Vout, the other end of the tenth resistor RL is electrically connected to the ground terminal GND, and the other end of the first resistor R1 is electrically connected to the collector of the triode Q1;
One end of the second resistor R2, one end of the third resistor R3, one end of the fourth resistor R4 and one end of the sixth resistor R6 are respectively and electrically connected with the voltage output end Vout, the other end of the second resistor R2 is electrically connected with the emitter of the triode Q1, the other end of the third resistor R3 is respectively and electrically connected with the base of the triode Q1 and one end of the fifth resistor R5, the other end of the fourth resistor R4, one end of the second capacitor R2 and one end of the eighth resistor R8 are respectively and electrically connected with the cathode K of the three-terminal adjustable shunt reference source U2, the anode a of the three-terminal adjustable shunt reference source U2 is electrically connected with the ground end GND, the other end of the eighth resistor R8 is electrically connected with one end of the first capacitor C1, the reference electrode of the three-terminal adjustable shunt reference source U2 is respectively and electrically connected with the other end of the sixth resistor R6, the other end of the second capacitor C2, the other end of the first capacitor C1 and one end of the seventh resistor R7, and the other end of the seventh resistor R7 is electrically connected with the ground end GND.
The high-precision feedback circuit further comprises a diode DZ1, wherein the other end of the ninth resistor RU, one end of the second resistor R2, one end of the third resistor R3 and one end of the fourth resistor R4 are electrically connected with each other and then electrically connected with the positive electrode of the diode DZ1, and the negative electrode of the diode DZ1 is electrically connected with the voltage output end Vout.
With continued reference to fig. 4 and 5, a second embodiment of the present invention is:
The invention also provides a high-precision feedback circuit which comprises a control chip U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor RU, a tenth resistor RL, a first capacitor C1, a second capacitor C2, a MOS tube Q2 and a three-terminal adjustable shunt reference source U2; the model number of the three-terminal adjustable shunt reference source U2 is TL431.
The control chip U1 comprises a reference voltage pin FB, wherein the reference voltage pin FB is respectively and electrically connected with one end of a ninth resistor RU, one end of a tenth resistor RL and one end of a first resistor R1, the other end of the ninth resistor RU is electrically connected with a voltage output end Vout, the other end of the tenth resistor RL is electrically connected with a grounding end GND, and the other end of the first resistor R1 is electrically connected with a source electrode of a MOS tube Q2;
One end of the second resistor R2, one end of the third resistor R3, one end of the fourth resistor R4 and one end of the sixth resistor R6 are respectively and electrically connected with the voltage output end Vout, the other end of the second resistor R2 is electrically connected with the drain electrode of the MOS transistor Q2, the other end of the third resistor R3 is respectively and electrically connected with the gate electrode of the MOS transistor Q2 and one end of the fifth resistor R5, the other end of the fourth resistor R4, one end of the second capacitor C2 and one end of the eighth resistor R8 are respectively and electrically connected with the cathode K of the three-terminal adjustable shunt reference source U2, the anode a of the three-terminal adjustable shunt reference source U2 is electrically connected with the ground end GND, the other end of the eighth resistor R8 is electrically connected with one end of the first capacitor C1, the reference electrode of the three-terminal adjustable shunt reference source U2 is respectively electrically connected with the other end of the sixth resistor R6, the other end of the second capacitor C2, the other end of the first capacitor C1 and one end of the seventh resistor R7, and the other end of the seventh resistor R7 is electrically connected with the ground end GND.
The high-precision feedback circuit further comprises a diode DZ1, wherein the other end of the ninth resistor RU, one end of the second resistor R2, one end of the third resistor R3 and one end of the fourth resistor R4 are electrically connected with each other and then electrically connected with the positive electrode of the diode DZ1, and the negative electrode of the diode DZ1 is electrically connected with the voltage output end Vout.
In summary, in the high-precision feedback circuit provided by the present invention, the output voltage of the voltage output terminal is determined by the ninth resistor, the tenth resistor and the feedback compensation circuit, wherein when the voltage is normally output, the third resistor electrically connected to the base of the PNP transistor and the second resistor electrically connected to the emitter of the PNP transistor are properly adjusted to make the PNP transistor operate in the linear region. The first resistor is a current limiting resistor for feedback current. When the circuit works, the fourth resistor and the fifth resistor provide steady-state working current for the working state of the three-terminal adjustable shunt reference source, meanwhile, the fourth resistor provides working current for the voltage reference source of the three-terminal adjustable shunt reference source, and during normal working, the current breaks down through the three-terminal adjustable shunt reference source, the three-terminal adjustable shunt reference source provides a reference voltage of 2.5V, and the sixth resistor and the seventh resistor are used for carrying out proportional amplification on the output voltage. The eighth resistor, the first capacitor and the second capacitor are loop compensation networks of the circuit. Compared with the traditional scheme, the high-precision feedback circuit has stable loop, and greatly improves the output voltage precision, the load adjustment rate and the linear adjustment of the product. In addition, the MOS tube is further used for replacing the PNP triode, so that the precision of the output voltage can be further improved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.
Claims (10)
1. The feedback circuit for the control chip is characterized by comprising the control chip, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a ninth resistor, a tenth resistor, a triode and a three-terminal adjustable shunt reference source;
The control chip comprises a reference voltage pin, wherein the reference voltage pin is respectively and electrically connected with one end of a ninth resistor, one end of a tenth resistor and a collector electrode of the triode, the other end of the ninth resistor is electrically connected with a voltage output end, and the other end of the tenth resistor is electrically connected with a grounding end;
One end of the second resistor, one end of the third resistor and one end of the fourth resistor are respectively and electrically connected with the voltage output end, the other end of the second resistor is electrically connected with the emitter of the triode, the other end of the third resistor is respectively and electrically connected with the base of the triode and one end of the fifth resistor, the other end of the fifth resistor and the other end of the fourth resistor are respectively and electrically connected with the cathode of the three-terminal adjustable shunt reference source, the anode of the three-terminal adjustable shunt reference source is electrically connected with the grounding end, and the reference electrode of the three-terminal adjustable shunt reference source is electrically connected with the voltage output end.
2. A feedback circuit for a control chip as claimed in claim 1, comprising a current limiting resistor for the feedback current, the reference voltage pin being electrically connected to the collector of the transistor through the current limiting resistor.
3. A feedback circuit for a control chip as recited in claim 1, further comprising a loop compensation network circuit electrically connected to the cathode of the three-terminal adjustable shunt reference source and the reference electrode of the three-terminal adjustable shunt reference source, respectively.
4. A feedback circuit for a control chip according to claim 3, wherein the loop compensation network circuit comprises an eighth resistor, a first capacitor and a second capacitor;
The eighth resistor is connected with the first capacitor in series and then connected with the second capacitor in parallel, and two ends of the parallel connection are respectively and electrically connected with the cathode of the three-terminal adjustable shunt reference source and the reference electrode of the three-terminal adjustable shunt reference source.
5. The feedback circuit for a control chip of claim 1, further comprising a voltage amplification circuit, wherein the reference electrode of the three-terminal adjustable shunt reference source is electrically connected to the voltage output terminal through the voltage amplification circuit.
6. The feedback circuit for a control chip of claim 5, wherein the voltage amplifying circuit comprises a sixth resistor and a seventh resistor; one end of the sixth resistor is electrically connected with the voltage output end, the reference electrode of the three-end adjustable shunt reference source is respectively electrically connected with the other end of the sixth resistor and one end of the seventh resistor, and the other end of the seventh resistor is electrically connected with the grounding end.
7. The feedback circuit for a control chip of claim 1, further comprising a diode, wherein the other end of the ninth resistor, the one end of the second resistor, the one end of the third resistor, and the one end of the fourth resistor are electrically connected to each other and then electrically connected to an anode of the diode, and a cathode of the diode is electrically connected to the voltage output terminal; the model of the three-terminal adjustable shunt reference source is TL431.
8. The feedback circuit for the control chip is characterized by comprising the control chip, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a ninth resistor, a tenth resistor, an MOS tube and a three-terminal adjustable shunt reference source;
The control chip comprises a reference voltage pin, wherein the reference voltage pin is respectively and electrically connected with one end of a ninth resistor, one end of a tenth resistor and a source electrode of the MOS tube, the other end of the ninth resistor is electrically connected with a voltage output end, and the other end of the tenth resistor is electrically connected with a grounding end;
One end of the second resistor, one end of the third resistor and one end of the fourth resistor are respectively and electrically connected with the voltage output end, the other end of the second resistor is electrically connected with the drain electrode of the MOS tube, the other end of the third resistor is respectively and electrically connected with the grid electrode of the MOS tube and one end of the fifth resistor, the other end of the fifth resistor and the other end of the fourth resistor are respectively and electrically connected with the cathode of the three-terminal adjustable shunt reference source, the anode of the three-terminal adjustable shunt reference source is electrically connected with the grounding end, and the reference electrode of the three-terminal adjustable shunt reference source is electrically connected with the voltage output end.
9. The feedback circuit for a control chip of claim 8, further comprising a diode, wherein the other end of the ninth resistor, the one end of the second resistor, the one end of the third resistor, and the one end of the fourth resistor are electrically connected to each other and then electrically connected to an anode of the diode, and wherein a cathode of the diode is electrically connected to the voltage output terminal.
10. The feedback circuit for a control chip of claim 8, wherein the three-terminal adjustable shunt reference source is model TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410062877.7A CN117950439A (en) | 2018-12-24 | 2018-12-24 | Feedback circuit for control chip |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410062877.7A CN117950439A (en) | 2018-12-24 | 2018-12-24 | Feedback circuit for control chip |
| CN201811578757.3A CN109445502B (en) | 2018-12-24 | 2018-12-24 | High-precision feedback circuit |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811578757.3A Division CN109445502B (en) | 2018-12-24 | 2018-12-24 | High-precision feedback circuit |
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| CN117950439A true CN117950439A (en) | 2024-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410062877.7A Pending CN117950439A (en) | 2018-12-24 | 2018-12-24 | Feedback circuit for control chip |
| CN201811578757.3A Active CN109445502B (en) | 2018-12-24 | 2018-12-24 | High-precision feedback circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102163922B (en) * | 2011-05-13 | 2013-06-05 | 深圳航天科技创新研究院 | Magnetic isolating feedback circuit containing voltage signal and current signal of switch power supply |
| CN104300773B (en) * | 2014-10-17 | 2017-04-26 | 深圳航天科技创新研究院 | Self-adaptation dummy-load circuit |
| CN204559208U (en) * | 2015-05-15 | 2015-08-12 | 富阳怀邦机械有限公司 | A kind of ice storing time power supply circuits |
| CN107453608A (en) * | 2017-09-28 | 2017-12-08 | 广东美的厨房电器制造有限公司 | A kind of feedback circuit and micro-wave oven |
| CN208969530U (en) * | 2018-12-24 | 2019-06-11 | 厦门能瑞康电子有限公司 | A kind of high-precision feed circuit |
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| CN109445502A (en) | 2019-03-08 |
| CN109445502B (en) | 2024-02-02 |
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