MT6M15962a
© Fuji Electric Co., Ltd. All rights reserved.
• The protection operation is not activated if the IGBT chip surface temperature
T
vj
exceeds and drops
below
T
jOH
within 1ms, regardless of whether
V
in
is in ON or OFF. (1),(2)
• If
T
vj
drops below
T
jOH
-
T
jH
for longer than 8μs after
T
vj
exceeds
T
jOH
, the
T
jOH
detection timer of
which duration is approximately 1ms is reset. (3)
V
in
: Input signal voltage
V
ALM
: Alarm signal voltage
I
C
: Collector current
t
ALM(TjOH)
: Alarm signal hold time
T
jOH
: IGBT chips over heating protection temperature level
T
jH
: Over heating protection hysteresis
3-20
Fig.3-14
T
jOH
protection operation (2)
5.7 IGBT chips over heating protection (
T
jOH
) operation
: When the ON/OFF state of
V
in
does not affect the protection operation
8
the IGBT
chip surface
temperature
