©2002 Fairchild Semiconductor Corporation

Rev. B1, February 2002

P1 : Normal operation - IGBT ON and conducting currents

P2 : Short-circuit current detection

P3 : IGBT gate interrupt / Fault signal generation

P4 : IGBT is slowly turned off

P5 : IGBT OFF signal

P6 : IGBT ON signal - but IGBT cannot be turned on during the fault-output activation

P7 : IGBT OFF state

P8 : Fault-output reset and normal operation start

Fig. 13. Short-circuit Current Protection (Low-side Operation only)

Note

Fig. 14. Recommended CPU I/O Interface Circuit

Internal IGBT

Gate-Emitter Voltage

Input Signal

Output Current

Sensing Voltage

Fault Output Signal

P1

P2

P3

P4

P6

P5

P7

P8

SC Reference

Voltage (0.5V)

RC Filter Delay

SC Detection

CPU

CO M

5V-Line

1.2nF

0.47nF

1nF

Ω

4.7k

Ω

4.7k

Ω

4.7k

,,

,,

FPB L15SL60

Ω

100

Ω

100

Ω

100

1nF