KR102228008B1 - Apparatus for protecting low side driver and delay method of parasitic components using the same - Google Patents

Abstract

According to a preferred embodiment of the present invention, a protection device of a low-side driver in a vehicle control unit includes a parasitic component operation delay unit for delaying an operation of a parasitic component of the low-side driver by applying a predetermined voltage to the output terminal of the low-side driver, when the voltage at the output terminal of the low-side driver increases in the negative (-) direction.

Description

Protection device of low-side driver and delay method of parasitic component operation using the same {APPARATUS FOR PROTECTING LOW SIDE DRIVER AND DELAY METHOD OF PARASITIC COMPONENTS USING THE SAME}

The present invention relates to a low-side driver of a vehicle controller, and, for example, to a protection device for a low-side driver and a method for delaying the operation of parasitic components using the same.

In general, a low-side driver circuit is applied to an electric system for a vehicle to drive and control an actuator (load).

Such automotive electrical systems include battery short circuit failure (hereinafter, StB: Short circuit to Battery), ground short circuit failure (hereinafter, StG: Short Circuit to Ground), or load open failure (hereinafter, OL: Open Load) at the output of the low-side driver circuit. ), etc., is detected to increase the stability of circuits and systems.

The structure of a general low-side driver IC including an electronic control unit and a load in a vehicle electrical system may be shown in FIG. 1.

Referring to Figure 1, the low-side driver IC (Driver IC) is a separate function module (10: Other Functions), a control logic (20: Logic) for driving a load (LOAD), fault detection for detecting StB, STG, OL It may include a module 30: Fault Detection, a driver control module 40: Driver Control, and a current control module 50: Current Control.

One terminal of the load (LOAD) is connected to the vehicle battery power (VBAT), and the other terminal of the load (LOAD) is the output terminal (OUT) or power MOSFET (M1: Power MOSFET) of the low-side driver IC. It is connected to the drain terminal of ).

In the case of such a low-side driver IC, when a connection problem of the electric wire in the vehicle occurs and the output terminal (OUT) is directly connected to the ground and becomes a ground short-circuit, system malfunction and physical failure of the in-vehicle device due to overcurrent are caused. There will be a problem such as that.

In general, the low-side driver IC (Driver IC) changes the voltage level and current amount of the output terminal (OUT) according to the ON or OFF operation of the power MOSFET (M1: Power MOSFET) in order to solve the above problems. StG failure can be detected through the potential difference between the two ends of the shunt resistor (R _{SHUNT) that occurs.}

However, the conventional StG failure detection technology is limited only when the vehicle chassis (body) ground (Chassis_GnD) is normally connected to the ground output terminal (ECU_GND) of the vehicle electronic control unit (ECU).

For example, as shown in FIG. 2, due to the wire problem of the vehicle, the driver IC is in a state in which a _{resistance component (R SHIFT} ) exists between the ground terminal (ECU_GND) of the electronic control unit and the chassis ground (Chassis_GND). When a StG error occurs for the output terminal (OUT), the output terminal (OUT) of the driver IC has a negative (-) voltage. In this case, the StG error can be detected as normal, but _{if the resistance value of the resistance component (R SHIFT} ) is large, the output terminal (OUT) of the driver IC has a lower negative (-) voltage. A condition in which parasitic BJTs and parasitic diodes, which are parasitic components, may be turned on may occur.

In the past, when the current for the operation of the electronic control unit was applied to the inside of the controller through the ECU power (ECU_PWR) connector, it flowed out to the ground terminal (ECU_GND) of the electronic control unit. The current applied into the control unit starts to flow to the output terminal (ECU_OUT) of the electronic control unit through the parasitic component. At this time, if the resistance component (R _SHIFT ) has a larger value and the amount of current flowing through the parasitic component increases, the internal reference voltage and reference current of the driver IC may fluctuate, causing a serious malfunction of the driver IC. There may be a problem in which the is damaged.

Korean Patent Application Publication No. 10-2015-0057633

Accordingly, the present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a protection device for a low-side driver that protects a driver IC from failure by delaying the parasitic component from turning on by adding a relatively simple circuit.

A protection device for a low-side driver according to a preferred embodiment of the present invention for achieving the above object is, in the protection device for a low-side driver of a vehicle controller, the voltage at the output terminal of the low-side driver is in a negative (-) direction. When increasing, a parasitic component operation delay unit is applied to the output terminal of the low-side driver to delay the operation of the parasitic component by applying a predetermined voltage to the output terminal of the low-side driver.

The parasitic component operation delay unit includes a first input terminal to which a ground voltage is input, and a second input terminal to which the ground voltage is lowered, and compares voltages between the first input terminal and the second input terminal according to a comparison result. It may include a first comparator for outputting at least two switching operation signals.

The first comparator, when the voltage of the first input terminal is greater than the voltage of the second input terminal, outputs a first switching operation signal, and when the voltage of the second input terminal is less than the voltage of the second input terminal, the second switching It can output an operation signal.

The parasitic component operation delay unit includes a positive input terminal to which the ground voltage is input or a Schottky voltage is input according to an output signal of the first comparator, and the ground voltage is lowered and input according to an output signal of the first comparator. A second comparator having a negative input terminal and outputting a gate voltage according to a comparison result by comparing voltages of the positive input terminal and the negative input terminal.

The second comparator may turn on the power switch of the low-side driver by outputting the gate voltage when the voltage of the positive input terminal is greater than the voltage of the negative input terminal.

A first Schottky diode connected between ground and a positive input terminal of the second comparator, and a second Schottky diode connected between ground and an output terminal of the low-side driver.

A first switch connected between ground and a negative input terminal of the second comparator, and a second switch connected between the first Schottky diode and a positive input terminal of the second comparator.

The first switch and the second switch may be turned on according to a second switching operation signal of the first comparator.

A third switch having one end connected to the ground and the other end connected between the first switch and the negative input terminal of the second comparator, and one end connected to the ground and the other end between the second switch and the positive input terminal of the second comparator It may include a fourth switch connected, and a fifth switch connected between ground and the second Schottky diode.

The third switch, the fourth switch, and the fifth switch may be turned on according to a first switching operation signal of the first comparator.

A first resistor connected to the output terminal of the low-side driver, a second resistor connected between the first resistance and the ground, and one end connected between the first resistor and the output terminal of the low-side driver, and the other end of the second switch And a third resistor R3 connected between the and the first diode.

A fourth resistor connected between ground and a second input terminal of the first comparator, a fifth resistor connected between the fourth resistor and the second Schottky diode, and between the ground and the second Schottky diode It may include a sixth resistor to be connected.

In order to achieve the above object, a method for delaying a parasitic component operation using a protection device for a low-side driver according to a preferred embodiment of the present invention includes a method for delaying a parasitic component operation using a protection device for a low-side driver of a vehicle controller. A detection step of detecting whether the voltage at the output terminal of the low-side driver increases in a negative (-) direction using And a switch-on for turning on the power switch of the low-side driver in order to delay the increase in the voltage of the low-side driver output terminal when the voltage of the low-side driver output terminal increases in the negative (-) direction. Step; includes.

In the switching-on step, when the power switch is turned on, a bypass current is generated in the output terminal of the low-side driver to delay the operation of the parasitic component of the low-side driver.

According to the protection device for a low-side driver and a method for delaying the operation of the parasitic component using the same according to a preferred embodiment of the present invention, the _{parasitic component is turned on even when the output terminal current I OUT} of the low-side driver IC is only at the level of several tens of mA. In contrast to the prior art, which can cause a malfunction of the low-side driver IC, the _{parasitic component is not turned on even if the output end current (I OUT} ) of the low-side driver IC reaches hundreds of mA and several A levels. This has the effect of remarkably reducing the probability of malfunction of the low-side driver IC.

1 is a diagram showing the structure of a driver IC of an electronic control unit according to the prior art.
2 is a diagram for explaining a problem that occurs due to a StG failure of a driver IC of an electronic control unit according to the prior art.
3 is a diagram showing the structure of a low-side driver IC to which a protection device according to a preferred embodiment of the present invention is applied.
4 is a circuit diagram showing an enlarged configuration of the protection device of FIG. 3.
5 is a graph showing a relationship between an output voltage and an output current of a low-side driver according to the prior art.
6 is a graph showing a relationship between an output voltage and an output current of a low-side driver improved by a protection device according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible, even if they are indicated on different drawings. In addition, a preferred embodiment of the present invention will be described below, but the technical idea of the present invention is not limited or limited thereto, and may be modified and variously implemented by those skilled in the art.

3 is a diagram showing the structure of a low-side driver IC to which a protection device according to a preferred embodiment of the present invention is applied. 4 is a circuit diagram showing a detailed configuration of the protection device of FIG. 3.

3 and 4, the protection device 100 according to the preferred embodiment of the present invention is applied to the low-side driver IC, thereby preventing the turn-on operation of parasitic components even when a StG failure of the output terminal OUT occurs. Malfunction due to parasitic components can be prevented in advance through the protective device 100.

The protection device 100 for a low-side driver according to a preferred embodiment of the present invention includes a parasitic operation delay unit 110 having two comparators CP1 and CP2, two Schottky diodes D1 and D2, And a plurality of switches S1, S2, S3, S4, S5, and a plurality of resistors R1, R2, R3, R4, R5, R6.

When the voltage of the LSD output of the low-side driver increases in the negative (-) direction, the parasitic component operation delay unit 110 applies a predetermined voltage to the LSD output of the low-side driver to generate a low voltage. It is possible to delay the operation of the parasitic component of the low-side driver by the negative voltage of the LSD output of the side driver. To this end, the parasitic component operation delay unit 110 may include a first comparator CP1 and a second comparator CP2.

The first comparator CP1 may include a first input terminal (+) to which a ground voltage is input, and a second input terminal (-) to which an internal source or a lowered ground voltage is input. The first comparator CP1 may include a positive voltage terminal VCC and a negative voltage terminal VSS connected to an internal supply. The first comparator CP1 may compare voltages of the first input terminal and the second input terminal. The comparator CP1 may include an output terminal for outputting a comparison result. The first comparator CP1 may output at least two switching operation signals through an output terminal. The two switching operation signals may include a first switching operation signal CMP_OB and a second switching operation signal CMP_O. The first comparator CP1 may output the first switching operation signal CMP_OB when the voltage of the first input terminal is less than the voltage of the second input terminal. The first comparator CP1 may output a second switching operation signal CMP_O when the voltage of the first input terminal is greater than the voltage of the second input terminal.

The first switching operation signal CMP_OB may control a turn-on operation of the third, fourth, and fifth switches S3, S4, and S5 to be described later. The second switching operation signal CMP_O may control a turn-on operation of the first and second switches S1 and S2 to be described later.

The second comparator CP2 has a positive input terminal (+) to which a ground voltage is input or a Schottky voltage is input according to an output signal of the first comparator CP1, and a ground voltage according to the output signal of the first comparator CP1. Alternatively, a negative input terminal (-) to which a resistance voltage is input may be provided. The second comparator CP2 may include an enable end EN to which the second switching operation signal CMP_O is input. When the second switching operation signal CMP_O is input, the second comparator CP2 may compare voltages of the positive input terminal and the negative input terminal and output a gate voltage according to the comparison result. The second comparator CP2 may output a gate voltage when the voltage of the positive input terminal is greater than the voltage of the negative input terminal. The gate voltage is applied to the gate terminal of the power switch M1 of the low-side driver to control a turn-on operation.

The two Schottky diodes are a first Schottky diode (D1) connected between ground and a positive input terminal (+) of the second comparator (CP2), a first comparator (CP1), a second comparator (CP2), or a ground. And a second Schottky diode D2 connected between the LSD output and the low-side driver. Each of the first Schottky diode D1 and the second Schottky diode D2 may operate to block current flow when a voltage less than the Schottky voltage is applied, and to flow current when a voltage higher than the Schottky voltage is applied.

The plurality of switches includes a first switch S1 connected between the ground and a negative input terminal (-) of the second comparator CP2, and a positive input terminal (+) of the first Schottky diode D1 and the second comparator CP2. ) It may include a second switch (S2) connected between. Here, the first switch S1 and the second switch S2 may be turned on according to the second switching operation signal of the first comparator CP1.

In addition, the plurality of switches has one end connected to the ground, the other end connected between the first switch S1 and the negative input terminal (-) of the second comparator CP2, a third switch S3, and one end connected to the ground. A fourth switch S4 with the other end connected between the second switch S2 and the positive input terminal (+) of the second comparator CP2, and a fifth switch connected between the ground and the second Schottky diode D2 It may include (S5).

The third switch S3, the fourth switch S4, and the fifth switch S5 may be turned on according to the first switching operation signal CMP_OB of the first comparator CP1. .

The plurality of resistors include a first resistor R1 connected to the LSD output of the low-side driver, a second resistor R2 connected between the first resistor R1 and the ground, and one end of the first resistor R1. ) And a third resistor R3 connected between the LSD output of the low-side driver and the other end connected between the second switch S2 and the first diode D1. Here, the second resistor R2 may drop the ground voltage and transfer it to the negative input terminal (-) of the second comparator CP2.

In addition, the plurality of resistors are between the fourth resistor R4, the fourth resistor R4 and the second Schottky diode D2 connected between the ground and the second input terminal (-) of the first comparator CP1. It may include a fifth resistor R5 to be connected, and a sixth resistor R6 to be connected between the ground and the second Schottky diode D2. Here, the fourth resistor R4 may drop the ground voltage and transmit it to the second input terminal (-) of the first comparator CP1.

5 is a graph showing a relationship between an output voltage and an output current of a low-side driver according to the prior art.

3 and 5, due to the wire problem of the vehicle, the low side in a state in which a _{relatively high resistance component (R SHIFT} ) exists between the ground terminal (ECU_GND) of the electronic control unit and the vehicle body (Chassis_GND). When a StG error occurs at the driver output terminal (OUT or ECU_OUT), a negative voltage is applied to the output terminal (OUT or ECU_OUT) of the low-side driver. do. In the low-side driver IC structure, the relationship between the voltage VOUT and the current IOUT of the output terminal OUT or ECU_OUT is shown as shown in FIG. 5. When the voltage (VOUT) of the output terminal (OUT or ECU_OUT) of _{the low-side driver reaches the parasitic voltage (-V F_Par} ), a very large amount of parasitic current begins to flow along the internal substrate of the low-side driver IC. Here, the parasitic voltage (-V _{F_Par} ) refers to a voltage at which parasitic components such as parasitic diodes and BJTs can be turned on.

In addition, as the current flowing from the output terminal (OUT or ECU_OUT) of the low-side driver increases, the parasitic component located on the substrate farther from the output terminal (OUT or ECU_OUT) operates and a parasitic current is generated. If the current flowing from the output terminal (OUT or ECU_OUT) increases and operates up to the parasitic component of the reference voltage and reference current generation block area inside the low-side driver IC, the low-side driver IC may cause serious malfunction. If there are too many parasitics to handle, the low-side driver IC may be damaged.

6 is a graph showing a relationship between an output voltage and an output current of a low-side driver to which a protection device according to a preferred embodiment of the present invention is applied.

에 도달하게 되면, 본 발명의 바람직한 실시예에 따른 보호 장치(100)에 의해 파워스위치(M1)가 동작하여 바이패스 전류(Bypass current)가 로우사이드 드라이버 출력단(OUT 또는 ECU_OUT)에 흐르게 된다. 이때 파워스위치(M1)는 비교적 낮은 저항값을 가지는 하나의 저항(Ron)으로 동작하게 된다. 바이패스 전류(Bypass Current)는 출력 전류(IOUT)가 되어 로우사이드 드라이버 출력단(OUT 또는 ECU_OUT)의 전압(VOUT)이 마이너스 방향으로 증가하는 것을 지연시킬 수 있다. 기존에는 출력 전류(IOUT)가 수십 mA 수준만 되어도 기생성분이 턴 온(Turn On)되어 로우사이드 드라이버 IC의 오동작을 발생시키는 반면에, 본 발명의 바람직한 실시예에 따른 보호 장치(100)는, 출력 전류(IOUT)가 수백 mA에서 수 A 수준이 되어도 기생성분의 동작 발생이 일어나지 않게 할 수 있으며, 로우사이드 드라이버 IC의 오동작 발생 확률을 획기적으로 줄일 수 있는 효과가 있다.6, the voltage VOUT of the low-side driver output terminal (OUT or ECU_OUT) is

When reaching, the power switch M1 is operated by the protection device 100 according to the preferred embodiment of the present invention, so that a bypass current flows to the low-side driver output terminal OUT or ECU_OUT. At this time, the power switch M1 operates as one resistor Ron having a relatively low resistance value. The bypass current becomes the output current IOUT and may delay an increase in the voltage VOUT of the low-side driver output terminal OUT or ECU_OUT in the negative direction. Conventionally, even if the output current IOUT is only at the level of several tens of mA, the parasitic component is turned on to cause a malfunction of the low-side driver IC, whereas the protection device 100 according to a preferred embodiment of the present invention, Even if the output current (IOUT) reaches several A levels from several hundred mA, it is possible to prevent the occurrence of parasitic operation, and has the effect of dramatically reducing the probability of malfunction of the low-side driver IC.

Hereinafter, a method of delaying the operation of parasitic components using the low-side driver protection device 100 having the above-described configuration will be described. In addition, it will be described that the power switch M1 of the low-side driver IC is basically turned off.

7 is a flowchart of a method for delaying an operation of a parasitic component using a protection device for a low-side driver according to a preferred embodiment of the present invention.

3 and 7, a method of delaying an operation of a parasitic component using a protection device for a low-side driver according to a preferred embodiment of the present invention may include a detection step S710 and a switch-on step S720.

First, in the detection step S710, the protection device 100 detects whether the voltage of the low-side driver output terminal OUT or ECU_OUT increases in the negative (-) direction using the ground voltage. This is possible by the first comparator CP1 of the protection device 100. When the output voltage VOUT of the low-side driver is greater than the second Schottky voltage VF_D2 of the second Schottky diode D2, the first comparator CP1 comprises the first switch S1 and the second switch. A first switching operation signal (CMP_OB) that causes S2) to be turned off, and to turn on the third switch S3, the fourth switch S4, and the fifth switch S5. Can be printed.

Then, in the switching-on step (S720), when the voltage of the low-side driver output terminal (OUT or ECU_OUT) increases in the negative (-) direction, the first comparator CP1 is In order to delay the increase of the output voltage VOUT, the power switch M1 of the low-side driver may be turned on. Here, when the voltage of the low-side driver output terminal (OUT or ECU_OUT) increases in the negative (-) direction, the first comparator CP1 is smaller than the second Schottky voltage VF_D2, the second comparator CP2 A second switching operation signal CMP_O for driving of may be output. At this time, the second Schottky diode D2 is turned on, and the first switch S1 and the second switch S2 are turned according to the second switching operation signal CMP_O of the first comparator CP1. When turned on, the third switch, the fourth switch, and the fifth switch S5 are turned off.

에 도달하게 되면, 제1 쇼트키 다이오드(D1)가 턴 온(On) 동작하게 된다. 이때 제2 비교기(CP2)는 정입력단과 부입력단에 입력되는 전압 차이를 이용하여 게이트 전압을 생성하고, 생성된 게이트 전압을 파워스위치(M1)에 인가함으로써 바이패스 전류가 로우사이드 드라이버 출력단(OUT 또는 ECU_OUT)에 흐르도록 한다. 여기서, 게이트 전압은 로우사이드 드라이버의 드라이버 컨트롤(Driver control) 유닛의 출력과 충돌이 일어나지 않도록 비교적 큰 구동력을 가질 수 있다. 파워스위치(M1)가 턴 온 되는 경우, 로우사이드 드라이버 출력단(OUT 또는 ECU_OUT)에 바이패스 전류가 발생하여 로우사이드 드라이버의 기생성분의 동작을 지연시킬 수 있다.After that, the output voltage (VOUT) of the low-side driver output terminal (OUT or ECU_OUT)

When reaching, the first Schottky diode D1 is turned on. At this time, the second comparator CP2 generates a gate voltage by using the voltage difference input to the positive input terminal and the negative input terminal, and applies the generated gate voltage to the power switch M1, so that the bypass current is reduced to the low-side driver output terminal (OUT). Or ECU_OUT). Here, the gate voltage may have a relatively large driving force so as not to collide with the output of the driver control unit of the low-side driver. When the power switch M1 is turned on, a bypass current is generated in the low-side driver output terminal OUT or ECU_OUT, thereby delaying the operation of the parasitic component of the low-side driver.

According to a preferred embodiment of the present invention, the parasitic component operation delay method using the protection device of the low-side driver according to the preferred embodiment of the present invention occurs even when the output current (IOUT) reaches several A levels from several hundred mA. This can be prevented from occurring, and the probability of malfunction of the low-side driver IC can be drastically reduced.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the technical field to which the present invention belongs can make various modifications, changes, and substitutions within the scope not departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings. .

The steps and/or actions according to the invention may occur simultaneously in different embodiments in different orders, or in parallel, or in different embodiments for different epochs, etc., as can be understood by one of ordinary skill in the art. I can.

Depending on the embodiment, some or all of the steps and/or actions drive instructions, programs, interactive data structures, clients and/or servers stored on one or more non-transitory computer-readable media. At least some may be implemented or performed using one or more processors. The one or more non-transitory computer-readable media may be illustratively software, firmware, hardware, and/or any combination thereof. In addition, the functions of the "module" discussed herein may be implemented in software, firmware, hardware, and/or any combination thereof.

100: protection device of the low-side driver
110: parasitic component operation delay unit
CP1, CP2: first and second comparators
R1, R2, R3, R4, R5, R6: first, second, third, fourth, fifth, sixth resistance
D1, D2: first and second Schottky diodes
S1, S2, S3, S4, S5: 1st, 2nd, 3rd, 4th, 5th switches

Claims (14)

In the protection device of a low-side driver of a vehicle controller,
When the voltage of the output terminal of the low-side driver increases in the negative (-) direction, a parasitic-item operation delay unit delaying the operation of the parasitic component of the low-side driver by applying a predetermined voltage to the output terminal of the low-side driver The protection device of the low-side driver, including. The method of claim 1,
The parasitic component operation delay unit,
A first input terminal to which a ground voltage is input and a second input terminal to which an internal supply or a lowered ground voltage is input according to the voltage of the output terminal of the low-side driver, and the voltage of the first input terminal and the second input terminal is compared. And a first comparator for outputting at least two switching operation signals according to the comparison result. The method of claim 2,
The first comparator,
Outputting a first switching operation signal when the voltage of the first input terminal is less than the voltage of the second input terminal, and outputting a second switching operation signal when the voltage of the first input terminal is greater than the voltage of the second input terminal Low-side driver protection device characterized by. The method of claim 2,
The parasitic component operation delay unit,
A positive input terminal to which a ground voltage or a Schottky voltage of a first Schottky diode connected between the ground and the ground is input according to an output signal of the first comparator;
A negative input terminal to which a ground voltage or a voltage of a resistance connected between the output terminal of the low-side driver and the ground is input according to an output signal of the first comparator,
And a second comparator for comparing voltages of the positive input terminal and the negative input terminal and outputting a gate voltage according to a comparison result. The method of claim 4,
The second comparator is
When the voltage of the positive input terminal is greater than the voltage of the negative input terminal, the power switch of the low-side driver is turned on by outputting the gate voltage. The method of claim 4,
And a second Schottky diode connected between the first comparator, the second comparator or the ground, and an output terminal of the low-side driver. The method of claim 6,
Protection of a low-side driver, comprising: a first switch connected between ground and a negative input terminal of the second comparator, and a second switch connected between the first Schottky diode and a positive input terminal of the second comparator. Device. The method of claim 7,
The first switch and the second switch are turned on according to a second switching operation signal of the first comparator. The method of claim 7,
A third switch having one end connected to the ground and the other end connected between the first switch and the negative input terminal of the second comparator, and one end connected to the ground and the other end between the second switch and the positive input terminal of the second comparator And a fifth switch connected between the ground and the second Schottky diode. The method of claim 9,
The third switch, the fourth switch, and the fifth switch are turned on according to a first switching operation signal of the first comparator. The method of claim 9,
A first resistor connected to the output terminal of the low-side driver, a second resistor connected between the first resistance and the ground, and one end connected between the first resistor and the output terminal of the low-side driver, and the other end of the second switch And a third resistor (R3) connected between the first Schottky diode and the low-side driver. The method of claim 11,
A fourth resistor connected between ground and a second input terminal of the first comparator, a fifth resistor connected between the fourth resistor and the second Schottky diode, and between the ground and the second Schottky diode A protection device for a low-side driver, comprising: a sixth resistor to be connected. In the method for delaying the operation of parasitic components using a protection device for a low-side driver of a vehicle controller,
A detecting step of detecting whether the voltage at the output terminal of the low-side driver increases in a negative (-) direction using a ground voltage; And
When the voltage of the low-side driver output terminal increases in the negative (-) direction, a switch-on step of turning on the power switch of the low-side driver to delay the increase of the voltage of the low-side driver output terminal ;
Parasitic component operation delay method using a protection device for a low-side driver comprising a. The method of claim 13,
In the switch-on step,
When the power switch is turned on, a bypass current is generated in the output terminal of the low-side driver to delay the operation of the parasitic component of the low-side driver. .

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