CN208890774U - A kind of circuit structure improving load switch stability - Google Patents
A kind of circuit structure improving load switch stability Download PDFInfo
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- CN208890774U CN208890774U CN201821766128.9U CN201821766128U CN208890774U CN 208890774 U CN208890774 U CN 208890774U CN 201821766128 U CN201821766128 U CN 201821766128U CN 208890774 U CN208890774 U CN 208890774U
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- main switch
- field
- effect tube
- voltage
- operational amplifier
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Abstract
The utility model relates to load switch fields, disclose a kind of circuit structure for improving load switch stability.Including grid control circuit, first main switch, second main switch, operational amplifier, voltage source and field-effect tube, first main switch and the second main switch source electrode are connected, first main switch, the drain electrode of second main switch is respectively VIN and VOUT, the grid of first main switch and the second main switch is all connected with grid control circuit, the output end of node connection operational amplifier between second main switch and grid control circuit, the grid of the grid connection field-effect tube of second main switch, the reverse input end of the source electrode connection operational amplifier of the field-effect tube, the drain electrode of the field-effect tube connects VOUT, node between the source electrode of field-effect tube and the reverse input end of operational amplifier is the test point of output voltage, the noninverting input and V of the operational amplifier Voltage source is set between IN.This programme makes the stabilization loop that single low-frequency pole is still maintained when large load current becomes small load current.
Description
Technical field
The utility model relates to load switch technical field, especially a kind of circuit knot for improving load switch stability
Structure.
Background technique
In the application of load switch, backward voltage is needed to turn off defencive function.It is (ideal to generally use idea diode
Diode) working method, according to load modulated forward conducting voltage, it is therefore an objective to load it is small when conduction impedance significantly increase
Greatly, so as to being accurately detected reverse current.Common practices is that the signal of directly detection load switch output end comes at present
It compares with input end signal, while utilizing control loop by the signal of output end and input end signal clamper at lesser one
Value.The conduction impedance of load switch can be adjusted and be become larger when small load current by this control loop, so that conducting resistance
The anti-product with load current appoints the voltage value for so maintaining clamper.At this time control loop will appear the pole of two low frequencies:
The grid and output point of load switch.Therefore when load current occurs from big to small, loop adjustment will be overshooted, and be led
Switch is caused situations such as abnormal shutdown occur.
Utility model content
The purpose of this utility model is that: in view of the above problems, provide a kind of raising load switch stability
Circuit structure.
The technical solution adopted in the utility model is such that a kind of circuit structure for improving load switch stability, tool
Body includes grid control circuit, the first main switch, the second main switch, operational amplifier, voltage source and field-effect tube, described
First main switch and the second main switch source electrode are connected, and the drain electrode of first main switch is voltage input end, and described the
The drain electrode of two main switches is voltage output end, and the grid of first main switch and the second main switch is all connected with grid control
Circuit processed, the output end of the node connection operational amplifier between second main switch and grid control circuit, described the
The grid of the grid connection field-effect tube of two main switches, the reversed input of the source electrode connection operational amplifier of the field-effect tube
The drain electrode at end, the field-effect tube connects voltage output end, the reversed input of the source electrode and operational amplifier of the field-effect tube
Node between end is the test point of output voltage, is arranged between the noninverting input and voltage input end of the operational amplifier
Voltage source.
Further, it is grounded after the node connection bias current between the test point and field-effect tube of the output voltage.
Further, the voltage output end, the drain electrode of the second main switch and the drain electrode of field-effect tube are all connected with capacitor
It is grounded after device.
Further, first main switch and the second main switch are N-channel field-effect tube.
Further, the equal N-channel field-effect tube of the field-effect tube.
Compared with prior art, by adopting the above technical scheme have the beneficial effect that the technical solution of the utility model be added
Field-effect tube, the second main switch and increased field-effect tube row for making load switch are at a rapid feedback circuit, by voltage
The voltage value clamper of input terminal and the test point VOUT SENSE of voltage output provide one under the premise of V_drop
The source electrode of the gate node of two main switches to output voltage terminal test point follows rapid feedback access so that loop is negative greatly
Carrying electric current becomes the stabilization loop that single low-frequency pole is still maintained when small load current.
Detailed description of the invention
Fig. 1 is the schematic diagram for the circuit structure that the utility model improves load switch stability.
Specific embodiment
With reference to the accompanying drawing, the utility model is described in detail.
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
As described in Figure 1, a kind of circuit structure improving load switch stability, specifically includes grid control circuit, first
Main switch MN1, the second main switch MN2, operational amplifier Gm, voltage source V_drop and field-effect tube MN 2_M, described
One main switch MN1 and the second main switch MN2 source electrode are connected, and the drain electrode of the first main switch MN1 is voltage input end
The drain electrode of VIN, the second main switch MN2 are voltage output end VOUT, the grid G ate_ of the first main switch MN1
The grid G ate_MN2 of MN1 and the second main switch MN2 are all connected with grid control circuit (Switch Gates Control), institute
The output end of the node connection operational amplifier between the second main switch MN2 and grid control circuit is stated, second master opens
The grid of the grid G ate_MN2 connection field-effect tube MN 2_M of pipe MN2 is closed, the source electrode of the field-effect tube MN 2_M connects fortune
The reverse input end of amplifier is calculated, the drain electrode of the field-effect tube MN 2_M connects voltage output end VOUT, the field-effect tube
The test point VOUT that node between the source electrode of MN 2_M and the reverse input end of operational amplifier Gm is output voltage VO UT
Voltage source is set between the noninverting input and voltage input end VIN of SENSE, the operational amplifier Gm, the voltage source
Voltage is V_drop, and the pressure difference clamper between voltage input end and the test point VOUT SENSE of voltage output is in voltage value V_
drop。
The present embodiment by being added field-effect tube MN2_M, the second main switch MN2 and field-effect tube MN2_M row at
One rapid feedback circuit.The effect of operational amplifier Gm is the grid G ate_MN2 by adjusting the second main switch MN2
Voltage simultaneously passes through feed circuit path, by the voltage clamping of the test point VOUT_SENSE of output voltage VO UT in VIN-V_drop
(the voltage value clamper of voltage input end and voltage output end is in V_drop).Grid G ate_MN2 is since impedance is big, parasitic capacitance
Also larger, to be a low-frequency pole in signal path.If not using field-effect tube MN2_M, the feedback of signal
Access just directly arrives test point VOUT_SENSE simply by voltage output end VOUT, and the electricity of voltage output end VOUT node
Appearance CL is very big, and when load current is lesser, the impedance of the second main switch MN2 is also larger, will appear again in such loop
One low-frequency pole, to generate stability problem.The field-effect tube MN2_M of the present embodiment provides one from grid G ate_
The source electrode of MN2 node to test point VOUT_SENSE follow rapid feedback access so that loop when small load current still
So keep the stabilization loop of single low-frequency pole.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (5)
1. a kind of circuit structure for improving load switch stability, it is characterised in that: specifically include grid control circuit, the first master
Switching tube, the second main switch, operational amplifier, voltage source and field-effect tube, first main switch and the second main switch
Pipe source electrode is connected, and the drain electrode of first main switch is voltage input end, and the drain electrode of second main switch is that voltage is defeated
The grid of outlet, first main switch and the second main switch is all connected with grid control circuit, second main switch
Node between grid control circuit connect the output end of operational amplifier, the grid connection field effect of second main switch
Should pipe grid, the reverse input end of the source electrode connection operational amplifier of the field-effect tube, the drain electrode of the field-effect tube connects
Voltage output end is connect, the node between the source electrode of the field-effect tube and the reverse input end of operational amplifier is output voltage
Voltage source is arranged between the noninverting input and voltage input end of the operational amplifier in test point.
2. improving the circuit structure of load switch stability as described in claim 1, it is characterised in that: the output voltage
It is grounded after node connection bias current between test point and field-effect tube.
3. improving the circuit structure of load switch stability as claimed in claim 2, it is characterised in that: the voltage output
End, the drain electrode of the second main switch and the drain electrode of field-effect tube are grounded after being all connected with capacitor.
4. improving the circuit structure of load switch stability as described in claim 1, it is characterised in that: first main switch
Pipe and the second main switch are N-channel field-effect tube.
5. improving the circuit structure of load switch stability as described in claim 1, it is characterised in that: the field-effect tube is equal
N-channel field-effect tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821766128.9U CN208890774U (en) | 2018-10-26 | 2018-10-26 | A kind of circuit structure improving load switch stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821766128.9U CN208890774U (en) | 2018-10-26 | 2018-10-26 | A kind of circuit structure improving load switch stability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208890774U true CN208890774U (en) | 2019-05-21 |
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ID=66517346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821766128.9U Active CN208890774U (en) | 2018-10-26 | 2018-10-26 | A kind of circuit structure improving load switch stability |
Country Status (1)
| Country | Link |
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| CN (1) | CN208890774U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217855A (en) * | 2018-10-26 | 2019-01-15 | 成都英特格灵微电子技术有限公司 | A kind of circuit structure improving load switch stability |
| CN110830002A (en) * | 2019-11-27 | 2020-02-21 | 芯创智（北京）微电子有限公司 | High-bandwidth capacitor-free LDO (low dropout regulator) structure |
-
2018
- 2018-10-26 CN CN201821766128.9U patent/CN208890774U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109217855A (en) * | 2018-10-26 | 2019-01-15 | 成都英特格灵微电子技术有限公司 | A kind of circuit structure improving load switch stability |
| CN109217855B (en) * | 2018-10-26 | 2024-03-19 | 四川易冲科技有限公司 | Circuit structure for improving stability of load switch |
| CN110830002A (en) * | 2019-11-27 | 2020-02-21 | 芯创智（北京）微电子有限公司 | High-bandwidth capacitor-free LDO (low dropout regulator) structure |
| CN110830002B (en) * | 2019-11-27 | 2023-07-07 | 芯创智创新设计服务中心(宁波)有限公司 | High-bandwidth capacitance-free LDO structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210414 Address after: No.1, floor 4, building 10, No.303, group 3, liangfengding village, Zhengxing Town, Tianfu New District, Chengdu, Sichuan 610000 Patentee after: Sichuan Yichong Technology Co.,Ltd. Address before: 610000 South section of Tianfu Avenue, Tianfu New District, Chengdu City, Sichuan Province 2039 and 1609, 16th floor, Mei Haitang Center (Tianfu Chuangke) Patentee before: CHENGDU INTERNATIONAL GREEN MICROELECTRONIC TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |