KA3162 データシートの表示（PDF） - Fairchild Semiconductor

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KA3162

Single IGBT Gate Driver

Fairchild Semiconductor 

Application Information

1. FAULT-OUT DURATION TIME (TDUR)

1) Two modes in Fault-Out Duration.

- OCP mode

Fault-Out Duration operates after TOCP.

- SCP mode

If Vpin8 is over 6.5V, Fault-Out Duration will operate after TSCP.

2) TDUR (It can be adjusted by external capacitor (CDUR) is

TDUR = CDUR ⁄ 55µA × (5V – 1.4V)

= 2.7nF ⁄ 55µA × (5V – 1.4V)

= 176µs

2. SLOW TURN-OFF (TSLOW)

Internal Circuit

Low

Low

Q1

5

Q2

Q3

Vlink

L

O

A

D

FAN8800 (KA3162)

1) When SCP (Short Circuit Protection) is operated, Q3 turns on and Q2 turns on.

2) In the upper condition, Q2 flows the constant current of 35mA.

3) The capacitance of IGBT as the load is discharging by 35mA, that is Slow Turn-off.

4) Slow Turn-off time is

TSLOW = CIGBT ⁄ 35mA × (V5max – V5min)

= 4.7nF ⁄ 35mA × (15V – 1V)

= 1.9µs

7

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