Lower Arms
Control Input
Protection
Circuit State
SET
c6
c7
RESET
Internal IGBT
Gate - Emitter Voltage
Output Current
Sensing Voltage
c1
c2
SC
c3
c4
c8
SC Reference Voltage
of Shunt Resistance
CR Circuit Time
Fault Output Signal
c5
Constant Delay
(with the external shunt resistance and CR connection)
c1 : Normal operation: IGBT ON and carrying current.
c2 : Short-Circuit current detection (SC trigger).
c3 : Hard IGBT gate interrupt.
c4 : IGBT turns OFF.
c5 : Fault output timer operation starts: the pulse width of the fault output signal is set by the external capacitor C FO .
c6 : Input “LOW”: IGBT OFF state.
c7 : Input “HIGH”: IGBT ON state, but during the active period of fault output, the IGBT doesn’t turn ON.
c8 : IGBT OFF state.
Figure 8. Short-Circuit Protection (Low-Side Operation Only)
?2006 Fairchild Semiconductor Corporation
FSBB20CH60 Rev. C6
10
www.fairchildsemi.com
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