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Time Charts of Protective Function
In p u t S ig n a l
In te rn a l IG B T
P3
G a te -E m itte r V o lta g e
UV
C o n tro l S u p p ly V o lta g e
UV
P2
P5
re se t
d e te c t
O u tp u t C u rre n t
F a u lt O u tp u t S ig n a l
P1
P4
P6
P1 : Normal operation: IGBT ON and conducting current.
P2 : Under-voltage detection.
P3 : IGBT gate interrupt.
P4 : Fault signal generation.
P5 : Under-voltage reset.
P6 : Normal operation: IGBT ON and conducting current.
Figure 7. Under-Voltage Protection
P5
In p u t S ig n a l
P6
In te rn a l IG B T
G a te -E m itte r V o lta g e
O C D e te c tio n
P1
P4
O u tp u t C u rre n t
S e n s in g V o lta g e
P2
R C F ilte r D e la y
P7
O C R e fe re n c e
V o lta g e (0 .5 V )
F a u lt O u tp u t S ig n a l
P3
P8
P1 : Normal operation: IGBT ON and conducting current.
P2 : Over 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.
Figure 8. Over-Current Protection
?2005 Fairchild Semiconductor Corporation
FPDB50PH60 Rev. C3
8
www.fairchildsemi.com
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