CN208797574U - One kind driving negative supply circuit for power device - Google Patents
One kind driving negative supply circuit for power device Download PDFInfo
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- CN208797574U CN208797574U CN201821460203.9U CN201821460203U CN208797574U CN 208797574 U CN208797574 U CN 208797574U CN 201821460203 U CN201821460203 U CN 201821460203U CN 208797574 U CN208797574 U CN 208797574U
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- power supply
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Abstract
One kind driving negative supply circuit for power device, including power supply chip, the first sustained diode 1, protection diode D2, the cathode of first sustained diode 1 is connected to the input terminal pin of power supply chip, and the anode of the first sustained diode 1 is connected to the output pin of power supply chip；Power supply chip output pin and compare the first build-out resistor R1 be set between pin, the second build-out resistor R2 is set between the comparison pin and ground of power supply chip；The cathode of protection diode D2 is connected to the input terminal pin of power supply chip, and anode is connected to one end of discharge capacity C1, and the other end of discharge capacity C1 is connected to ground；Filter capacitor C2 is connected in parallel on the both ends of protection diode D2 and discharge capacity C1 series arm.The utility model protective device simply easily obtains, and improving cost is low, can solve most power supply chip output transient response problems, relax to power supply chip index request, buying pressure is small.
Description
Technical field
The utility model belongs to electronic circuit design field, is related to a kind of in the big electricity of power device driving power moment offer
A kind of voltage stabilizing technique of voltage overshoot and short-term jitter problem when stream output.
Background technique
Miniature Power Unit chip only requires that outputting and inputting a small amount of element such as shunt capacitance may make up in small application
Whole application scheme.Due to using linear regulation principle, output noise and ripple very little, it is generally suitable for input and output voltage
The lesser occasion of difference is well suited in the system application to noise-sensitive.In addition, have the characteristics that it is small in size, using simple, because
This is more and more widely using as one of essential module of electronic system power management.
But in the occasion of switch driving circuit, Miniature Power Unit chip due to gain bandwidth product and slew rate SR limitation,
Output voltage can not transient tracking load current quick variation.Externally the phenomenon that showing is: out-put supply with loading below
The transient change of electric current, and output voltage there is also overshoot and vibrate in short-term.
Summary of the invention
The utility model is existing for output voltage oscillation and overshoot caused by load instantaneous variation in power supply chip system
As providing a kind of output external circuit, output voltage concussion and mistake can be effectively reduced in Miniature Power Unit chip application
Rush phenomenon.
The utility model specifically uses following technical scheme:
One kind driving negative supply circuit, including power supply chip, the first sustained diode 1, protection two for power device
Pole pipe D2, it is characterised in that:
The cathode of first sustained diode 1 is connected to the input terminal pin of power supply chip, the first sustained diode 1
Anode be connected to the output pin of power supply chip；
Power supply chip output pin and compare the first build-out resistor R1 be set between pin, in the ratio of power supply chip
Compared with the second build-out resistor R2 is arranged between pin and ground；
The cathode of protection diode D2 is connected to the input terminal pin of power supply chip, and anode is connected to discharge capacity C1's
The other end of one end, discharge capacity C1 is connected to ground；
Filter capacitor C2 is connected in parallel on the both ends of protection diode D2 and discharge capacity C2 series arm.
The utility model further comprises following preferred embodiment:
Transition diode D3 is connected between the output pin and ground of power supply chip.
Power supply chip is connected in the cathode of both ends parallel connection the rectifier diode D4, rectifier diode D4 of transition diode D3
Output pin, anode are connected to the ground.
Electric capacity of voltage regulation C3 is connected between the input terminal pin and ground of power supply chip.
The input 15V DC voltage of the power supply chip exports 4V DC voltage.
The filter capacitor C2 is 10uF-100uF.
The advantages of the utility model:
Protective device simply easily obtains, and improving cost is low.
Most power supply chip output transient response problems can be solved, power supply chip index request are relaxed, buying pressure is small.
Detailed description of the invention
Fig. 1 the utility model drives negative supply circuit diagram for power device.
Specific embodiment
The utility model is described in further detail with specific implementation case with reference to the accompanying drawing.
It is described to be used for power device if Fig. 1 is the utility model for power device driving negative supply circuit diagram
Driving negative supply circuit includes including power supply chip, the first sustained diode 1, protection diode D2.First afterflow two
The cathode of pole pipe D1 is connected to the input terminal pin of power supply chip, and the anode of the first sustained diode 1 is connected to power supply chip
Output pin；Power supply chip output pin and compare the first build-out resistor R1 be set between pin, in power supply chip
Comparison pin and ground between the second build-out resistor R2 is set；The cathode of protection diode D2 is connected to the input terminal of power supply chip
Pin, anode are connected to one end of discharge capacity C1, and the other end of discharge capacity C1 is connected to ground；Filter capacitor C2 is connected in parallel on
The both ends of diode D2 and discharge capacity C2 series arm are protected, wherein the filter capacitor C2 is 10uF-100uF.
Transition diode D3 is connected between the output pin and ground of power supply chip.The both ends of transition diode D3 simultaneously
Join rectifier diode D4, the output pin of the cathode connection power supply chip of rectifier diode D4, anode is connected to the ground.In electricity
Electric capacity of voltage regulation C3 is connected between the input terminal pin and ground of source chip.The input 15V DC voltage of the power supply chip exports 4V
DC voltage.
Voltage of the chip for a LDO model LM317 for using TI company to produce in example as input 15V output 4V
Transformation.15V input power accesses U1 (LM317) input terminal pin 3 after C3 capacitor pressure stabilizing.It exports 2 feet and one is placed to 3 feet
Sustained diode 1.It requires 2 pairs of output pin to compare 1 foot of foot according to output voltage and 1 foot places build-out resistor over the ground.Output 2
It is quickly C70 electric discharge when with ground short circuit occurs for output that foot output, which increases protection diode, prevents U1 overload work.Output end is anti-
Only mono- 10uF capacitor of C2 makees output filtering use.LDO chip LM317 can be exported normally at this time.Output voltage is DC4.2V,
Source voltage as MOSFET element Q1, Q2.The driving signal of Q1, Q2 are 0V-15V driving signal, to ensure that Q1, Q2 are being closed
It is disconnected reliable, therefore it is higher than the design for turning off voltage 0V using Q1, Q2 source voltage.VE level to prevent LDO chip from exporting exists
There is the case where VE falls or overshoots when acting in rear class MOSFET element, and causes Q1, Q2 that cannot correctly act.It is exporting over the ground
Increase a 5V transition diode D2 model SMBJ5V0CA and rectifier diode D4.There is output electricity when LDO power supply exports
Press through punching and in short-term vibrate when 5V transition diode D3 model SMBJ5V0CA protection act by output voltage stabilization 5V with
Under.For the negative sense output voltage vibrated in short-term, earth-current can be imported power output end by rectifier diode D4, reduce negative sense vibration
Swing amplitude, it is ensured that output voltage stabilization.
The foregoing is merely a kind of case study on implementation of the utility model, it is noted that for the common skill of the art
For art personnel, without deviating from the technical principle of the utility model, several improvements and modifications can be made by opening, these change
It also should be regarded as the protection scope of the utility model into modification.
Claims (6)
1. one kind drives negative supply circuit, including power supply chip, the first sustained diode 1, two poles of protection for power device
Pipe D2, it is characterised in that:
The cathode of first sustained diode 1 is connected to the input terminal pin of power supply chip, and the first sustained diode 1 is just
Pole is connected to the output pin of power supply chip；
Power supply chip output pin and compare the first build-out resistor R1 be set between pin, draw in the comparison of power supply chip
Second build-out resistor R2 is set between foot and ground；
The cathode of protection diode D2 is connected to the input terminal pin of power supply chip, and anode is connected to the one of discharge capacity C1
End, the other end of discharge capacity C1 are connected to ground；
Filter capacitor C2 is connected in parallel on the both ends of protection diode D2 and discharge capacity C1 series arm.
2. according to claim 1 drive negative supply circuit for power device, it is characterised in that:
Transition diode D3 is connected between the output pin and ground of power supply chip.
3. according to claim 2 drive negative supply circuit for power device, it is characterised in that:
In the output of the cathode connection power supply chip of both ends parallel connection the rectifier diode D4, rectifier diode D4 of transition diode D3
Pin is held, anode is connected to the ground.
4. according to claim 1 or 3 drive negative supply circuit for power device, it is characterised in that:
Electric capacity of voltage regulation C3 is connected between the input terminal pin and ground of power supply chip.
5. according to claim 4 drive negative supply circuit for power device, it is characterised in that:
The input 15V DC voltage of the power supply chip exports 4V DC voltage.
6. according to claim 5 drive negative supply circuit for power device, it is characterised in that:
The filter capacitor C2 is 10uF-100uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821460203.9U CN208797574U (en) | 2018-09-06 | 2018-09-06 | One kind driving negative supply circuit for power device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821460203.9U CN208797574U (en) | 2018-09-06 | 2018-09-06 | One kind driving negative supply circuit for power device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208797574U true CN208797574U (en) | 2019-04-26 |
Family
ID=66208704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821460203.9U Active CN208797574U (en) | 2018-09-06 | 2018-09-06 | One kind driving negative supply circuit for power device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208797574U (en) |
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2018
- 2018-09-06 CN CN201821460203.9U patent/CN208797574U/en active Active
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