CN113872422A - Output drive circuit with output short-circuit protection function - Google Patents

Output drive circuit with output short-circuit protection function Download PDF

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Publication number
CN113872422A
CN113872422A CN202111282923.7A CN202111282923A CN113872422A CN 113872422 A CN113872422 A CN 113872422A CN 202111282923 A CN202111282923 A CN 202111282923A CN 113872422 A CN113872422 A CN 113872422A
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China
Prior art keywords
circuit
output
short
nmos transistor
protection
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CN202111282923.7A
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CN113872422B (en
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吴佳
李礼
吴叶楠
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Shanghai V&g Information Technology Co ltd
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Shanghai V&g Information Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Logic Circuits (AREA)
  • Electronic Switches (AREA)

Abstract

The utility model relates to an output drive circuit with output short-circuit protection function, including signal input part IN, first PMOS crystal and first NMOS transistor and signal output part OUT, first PMOS crystal with the grid of first NMOS transistor all with signal input part IN connects, first PMOS crystal with the drain electrode of first NMOS transistor all with signal output part OUT connects, still includes: the first protection circuit is used for increasing the on-resistance of the first protection circuit to reduce short-circuit current when the signal output end OUT outputs a high level and is connected with a low level of an external circuit; and the second protection circuit is used for increasing the on-resistance of the second protection circuit to reduce the short-circuit current when the signal output end OUT outputs a low level and is connected with a high level of an external circuit. The invention avoids the short circuit of the output pin caused by the conductive redundancy and solves the problem of chip damage.

Description

Output drive circuit with output short-circuit protection function
Technical Field
The present application relates to the field of computer technologies, and in particular, to an output driving circuit with an output short-circuit protection function.
Background
The driving circuit is generally located between the main circuit and the control circuit, and is an intermediate circuit for amplifying a signal of the control circuit, that is, for amplifying a signal of the control circuit so as to drive the power transistor. The basic task of the driving circuit is to convert the signal transmitted from the information electronic circuit into a signal which is added between the control end and the common end of the power electronic device and can be switched on or off according to the requirement of the control target of the information electronic circuit. The semi-control device only needs to provide an on control signal, and the full-control device only needs to provide the on control signal and the off control signal so as to ensure that the device is reliably turned on or off as required.
The output driving circuit of the integrated circuit may be equivalent to an inverter with a smaller transistor on-resistance, as shown in fig. 2, and may provide a larger driving current for the external load capacitor CL. However, if the design is not proper or conductive redundancy occurs on the output pin of the integrated circuit, the output terminals OUT of the two output driving circuits may be shorted together, and when the output levels of the two signal output terminals OUT are different, the output terminals OUT of a and B may be shorted, which may damage the chip. The existing solution is to enhance the design check, reduce the design error as much as possible, but still solve the problem that the chip is damaged due to the short circuit of the output pin caused by the conductive redundancy.
Disclosure of Invention
Therefore, in order to solve the above technical problems, it is necessary to provide an output driving circuit with an output short-circuit protection function, which can prevent the output pins from being short-circuited due to conductive redundancy and damage to the chip.
The technical scheme of the invention is as follows:
an output driving circuit with an output short-circuit protection function comprises a signal input end IN, a first PMOS (P-channel metal oxide semiconductor) crystal, a first NMOS (N-channel metal oxide semiconductor) transistor and a signal output end OUT, wherein the grids of the first PMOS crystal and the first NMOS transistor are connected with the signal input end IN, and the drains of the first PMOS crystal and the first NMOS transistor are connected with the signal output end OUT, and the output driving circuit further comprises:
one end of the first protection circuit is connected with the source electrode of the first PMOS transistor, the other end of the first protection circuit is also connected with a power supply end VDD, and the first protection circuit is used for increasing the on-resistance of the first protection circuit to reduce short-circuit current when the signal output end OUT outputs a high level and is connected with a low level of an external circuit;
and one end of the second protection circuit is connected with the source electrode of the first NMOS transistor, the other end of the second protection circuit is grounded, and the second protection circuit is used for increasing the on-resistance of the second protection circuit when the signal output end OUT outputs a low level and is connected with a high level of an external circuit so as to reduce the short-circuit current.
Specifically, the first protection circuit comprises a first switch tube and a first phase inverter, wherein a first end of the first switch tube is connected with a source electrode of the PMOS transistor and an input end of the first phase inverter, a second end of the first switch tube is connected with an output end of the first phase inverter, and a third end of the first switch tube is connected with the power supply end VDD.
Specifically, the first switch tube is a second PMOS transistor, the first end of the first switch tube is a drain, the second end of the first switch tube is a gate, and the third end of the first switch tube is a source.
Specifically, the second protection circuit comprises a second switch tube and a second phase inverter, wherein a first end of the second switch tube is connected with a source electrode of the first NOMS transistor and an input end of the second phase inverter, a second end of the second switch tube is connected with an output end of the second phase inverter, and a third end of the second switch tube is grounded.
Specifically, the second switch tube is a second NMOS transistor, a first end of the second NMOS transistor is a drain, a second end of the second NMOS transistor is a gate, and a third end of the second NMOS transistor is a source.
The invention has the following technical effects:
the output driving circuit with the output short-circuit protection function sequentially comprises a first protection circuit, one end of the first protection circuit is connected with the source electrode of the first PMOS transistor, the other end of the first protection circuit is also connected with a power supply end VDD, and when the signal output end OUT outputs a high level and is connected with a low level of an external circuit through the first protection circuit, the on-resistance of the first protection circuit is increased so as to reduce short-circuit current; and a second protection circuit is arranged, so that one end of the second protection circuit is connected with the source electrode of the first NMOS transistor, the other end of the second protection circuit is grounded, and the on-resistance of the second protection circuit is increased when the signal output end OUT outputs a low level and is connected with a high level of an external circuit, so that short-circuit current is reduced, and the problems of short circuit of an output pin and chip damage caused by conductive redundancy are solved.
Drawings
FIG. 1 is a circuit diagram of an output driver circuit with output short protection in one embodiment;
fig. 2 is a circuit diagram of a driving circuit in the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
IN one embodiment, as shown IN fig. 1, an output driving circuit with an output short-circuit protection function is provided, and includes a signal input terminal IN, a first PMOS transistor and a first NMOS transistor, and a signal output terminal OUT, wherein gates of the first PMOS transistor and the first NMOS transistor are both connected to the signal input terminal IN, and drains of the first PMOS transistor and the first NMOS transistor are both connected to the signal output terminal OUT.
The output drive circuit with the output short-circuit protection function further comprises the following circuits:
one end of the first protection circuit is connected with the source electrode of the first PMOS transistor, the other end of the first protection circuit is also connected with a power supply end VDD, and the first protection circuit is used for increasing the on-resistance of the first protection circuit to reduce short-circuit current when the signal output end OUT outputs a high level and is connected with a low level of an external circuit;
and one end of the second protection circuit is connected with the source electrode of the first NMOS transistor, the other end of the second protection circuit is grounded, and the second protection circuit is used for increasing the on-resistance of the second protection circuit when the signal output end OUT outputs a low level and is connected with a high level of an external circuit so as to reduce the short-circuit current.
In summary, the output driving circuit with the output short-circuit protection function of the present invention sequentially sets the first protection circuit, and makes one end of the first protection circuit connected to the source of the first PMOS transistor, and the other end of the first protection circuit further connected to a power supply terminal VDD, and through the first protection circuit, when the signal output terminal OUT outputs a high level and is connected to a low level of an external circuit, the on-resistance of the first protection circuit is increased to reduce a short-circuit current; and a second protection circuit is arranged, so that one end of the second protection circuit is connected with the source electrode of the first NMOS transistor, the other end of the second protection circuit is grounded, and the on-resistance of the second protection circuit is increased when the signal output end OUT outputs a low level and is connected with a high level of an external circuit, so that short-circuit current is reduced, and the problems of short circuit of an output pin and chip damage caused by conductive redundancy are solved.
In one embodiment, the first protection circuit includes a first switching tube and a first inverter, a first end of the first switching tube is connected to the source of the PMOS transistor and the input end of the first inverter, a second end of the first switching tube is connected to the output end of the first inverter, and a third end of the first switching tube is connected to the power supply terminal VDD.
In one embodiment, the first switch tube is a second PMOS transistor, the first end of the first switch tube is a drain, the second end of the first switch tube is a gate, and the third end of the first switch tube is a source.
In one embodiment, the second protection circuit includes a second switching tube and a second inverter, a first terminal of the second switching tube is connected to the source of the first NOMS transistor and an input terminal of the second inverter, a second terminal of the second switching tube is connected to an output terminal of the second inverter, and a third terminal of the second switching tube is grounded.
In one embodiment, the second switch tube is a second NMOS transistor, a first end of the second NMOS transistor is a drain, a second end of the second NMOS transistor is a gate, and a third end of the second NMOS transistor is a source.
Further, the working principle of the output driving circuit with the output short-circuit protection function in normal operation is as follows:
first, the operation principle is as follows, in which no short circuit occurs at the output port OUT:
when the signal input end IN is at a low level, the first PMOS transistor is conducted, the first NMOS transistor is cut off, at the moment, the first inverter inputs a high level and outputs a low level, the second PMOS transistor is conducted, the second inverter inputs a low level and outputs a high level, and the second NMOS transistor is conducted. Since both the first PMOS transistor and the second PMOS transistor are turned on, the first NMOS transistor is turned off although the second NMOS transistor is also turned on, so that the signal output terminal OUT is at a high level.
When the signal input end IN is at a high level, the first PMOS transistor is cut off, the first NMOS transistor is conducted, at the moment, the first inverter inputs a high level and outputs a low level, the second PMOS transistor is conducted, the second inverter inputs a low level and outputs a high level, and the second NMOS transistor is conducted. Since both the first and second NMOS transistors are turned on, the first PMOS transistor is turned off although the second PMOS transistor is also turned on, so that the signal output terminal OUT is at a low level.
The other condition is that the output port OUT is short-circuited, and at the moment, the two conditions are still divided into two conditions, namely when the output port OUT outputs a high level but is in short-circuit connection with a low level of an external circuit, a first PMOS transistor and a second PMOS transistor pass through a large current, the drain voltage of the second PMOS transistor is reduced, the output level of the first inverter is increased, the on-resistance of the second PMOS transistor is increased, the on-resistance of the whole output driving circuit is increased, the short-circuit current is reduced, and output short-circuit protection is achieved.
The other is that when the output port OUT outputs a low level but is short-circuited with a high level of an external circuit, the first NMOS transistor and the second NMOS transistor pass a large current, the drain voltage of the second NMOS transistor increases, the output level of the first inverter decreases, and the on-resistance of the second NMOS transistor increases, so that the on-resistance of the whole output driving circuit increases, the short-circuit current decreases, and the output short-circuit protection is realized.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (5)

1. An output drive circuit with an output short-circuit protection function comprises a signal input end IN, a first PMOS crystal, a first NMOS transistor and a signal output end OUT, wherein the grid electrodes of the first PMOS crystal and the first NMOS transistor are connected with the signal input end IN, and the drain electrodes of the first PMOS crystal and the first NMOS transistor are connected with the signal output end OUT, and the output drive circuit is characterized by further comprising:
one end of the first protection circuit is connected with the source electrode of the first PMOS transistor, the other end of the first protection circuit is also connected with a power supply end VDD, and the first protection circuit is used for increasing the on-resistance of the first protection circuit to reduce short-circuit current when the signal output end OUT outputs a high level and is connected with a low level of an external circuit;
and one end of the second protection circuit is connected with the source electrode of the first NMOS transistor, the other end of the second protection circuit is grounded, and the second protection circuit is used for increasing the on-resistance of the second protection circuit when the signal output end OUT outputs a low level and is connected with a high level of an external circuit so as to reduce the short-circuit current.
2. The output driving circuit with the output short-circuit protection function according to claim 1, wherein the first protection circuit includes a first switch tube and a first inverter, a first end of the first switch tube is connected to the source of the PMOS transistor and the input end of the first inverter, a second end of the first switch tube is connected to the output end of the first inverter, and a third end of the first switch tube is connected to the power supply terminal VDD.
3. The output driving circuit with the output short-circuit protection function according to claim 2, wherein the first switch tube is a second PMOS transistor, the first end of the first switch tube is a drain, the second end of the first switch tube is a gate, and the third end of the first switch tube is a source.
4. The output driving circuit with the output short-circuit protection function according to claim 1, wherein the second protection circuit comprises a second switching tube and a second inverter, a first terminal of the second switching tube is connected to the source of the first NOMS transistor and an input terminal of the second inverter, a second terminal of the second switching tube is connected to an output terminal of the second inverter, and a third terminal of the second switching tube is grounded.
5. The output driving circuit with the output short-circuit protection function according to claim 4, wherein the second switch transistor is a second NMOS transistor, a first end of the second NMOS transistor is a drain, a second end of the second NMOS transistor is a gate, and a third end of the second NMOS transistor is a source.
CN202111282923.7A 2021-11-01 2021-11-01 Output drive circuit with output short-circuit protection function Active CN113872422B (en)

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CN202111282923.7A CN113872422B (en) 2021-11-01 2021-11-01 Output drive circuit with output short-circuit protection function

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Application Number Priority Date Filing Date Title
CN202111282923.7A CN113872422B (en) 2021-11-01 2021-11-01 Output drive circuit with output short-circuit protection function

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CN113872422B CN113872422B (en) 2024-03-12

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5535086A (en) * 1994-09-22 1996-07-09 National Semiconductor Corp. ESD protection circuit and method for BICMOS devices
KR20010002483A (en) * 1999-06-15 2001-01-15 윤종용 Output driver circuit having voltage protection and increasing switching speed
US20080151455A1 (en) * 2006-12-22 2008-06-26 Hon Hai Precision Industry Co., Ltd. Circuit and method for protecting motherboard
CN104466914A (en) * 2013-12-11 2015-03-25 成都芯源系统有限公司 Short-circuit protection circuit and switching power supply and protection method thereof
US20160308352A1 (en) * 2015-04-14 2016-10-20 Elite Semiconductor Memory Technology Inc. Protection circuit for preventing an over-current from an output stage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5535086A (en) * 1994-09-22 1996-07-09 National Semiconductor Corp. ESD protection circuit and method for BICMOS devices
KR20010002483A (en) * 1999-06-15 2001-01-15 윤종용 Output driver circuit having voltage protection and increasing switching speed
US20080151455A1 (en) * 2006-12-22 2008-06-26 Hon Hai Precision Industry Co., Ltd. Circuit and method for protecting motherboard
CN104466914A (en) * 2013-12-11 2015-03-25 成都芯源系统有限公司 Short-circuit protection circuit and switching power supply and protection method thereof
US20160308352A1 (en) * 2015-04-14 2016-10-20 Elite Semiconductor Memory Technology Inc. Protection circuit for preventing an over-current from an output stage

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