©2013 Fairchild Semiconductor Corporation

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FNA21012A Rev. C0

Time Charts of SPMs Protective Function

Figure 11. Under-Voltage Protection (Low-Side)

a2 : Normal operation: IGBT ON and carrying current.

a4 : IGBT OFF in spite of control input condition.

a7 : Normal operation: IGBT ON and carrying current by triggering next signal from LOW to HIGH.

Figure 12. Under-Voltage Protection (High-Side)

b2 : Normal operation: IGBT ON and carrying current.

b4 : IGBT OFF in spite of control input condition, but there is no fault output signal.

b6 : Normal operation: IGBT ON and carrying current by triggering next signal from LOW to HIGH.

Input Signal

Output Current

Fault Output Signal

Control

Supply Voltage

RESET

Protection

Circuit State

SET

RESET

a1

a3

a2

a4

a6

a5

a7

Input Signal

Output Current

Fault Output Signal

Control

Supply Voltage

RESET

Protection

Circuit State

SET

RESET

b1

b3

b2

b4

b6

b5

High-level (no fault output)