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Time Charts of Protective Function
Input Signal
Protection
Circuit State
RESET
SET
RESET
UV CCR
Control
Supply Voltage
a1
UV CCD
a2
a3
a4
a6
a7
Output Current
a5
Fault Output Signal
a1 : Control supply voltage rises: after the voltage rises UV CCR , the circuits start to operate when next input is applied.
a2 : Normal operation: IGBT ON and carrying current.
a3 : Under-voltage detection (UV CCD ).
a4 : IGBT OFF in spite of control input condition.
a5 : Fault output operation starts.
a6 : Under-voltage reset (UV CCR ).
a7 : Normal operation: IGBT ON and carrying current.
Figure 11. Under-Voltage Protection (Low-Side)
Input Signal
Protection
Circuit State
RESET
SET
RESET
UV BSR
Control
Supply Voltage
b1
UV BSD
b2
b3
b4
b5
b6
Output Current
High-level (no fault output)
Fault Output Signal
b1 : Control supply voltage rises: after the voltage reaches UV BSR , the circuits start to operate when next input is applied.
b2 : Normal operation: IGBT ON and carrying current.
b3 : Under-voltage detection (UV BSD ).
b4 : IGBT OFF in spite of control input condition, but there is no fault output signal.
b5 : Under-voltage reset (UV BSR ).
b6 : Normal operation: IGBT ON and carrying current.
Figure 12. Under-Voltage Protection (High-Side)
?2011 Fairchild Semiconductor Corporation
FNA41560 / FNA41560B2 Rev. C3
11
www.fairchildsemi.com
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