MT6M15962a
5. タイミングチャート
© Fuji Electric Co., Ltd. All rights reserved.
• When the IGBT chip surface temperature
T
vj
exceeds
T
jOH
for 1ms continuously, an alarm signal is
output and the IGBT is turned off softly
※
1
. (4)
• Similar to (2), the alarm signal output by UV protection is cancelled while the protection operation of
t
ALM(TjOH)
continues. (5)
• The protection operation is reset after the elapse of
t
ALM(TjOH)
if
V
in
is in OFF-state and
T
vj
drops below
T
jOH
-
T
jH
. After this, if
V
CC
drops below
V
UV
continuously for 20μs, UV protection is activated and the
alarm signal is output. (6)
• The protection operation is stopped after the elapse of
t
ALM(UV)
if
V
in
is in OFF-state and
V
CC
exceeds
V
UV
+
V
H
. (7)
※
1 Soft turn off: This means a slower than normal turn-off.
t
ALM(TjOH)
: Alarm signal hold time
t
ALM(UV)
: Alarm signal hold time
T
jOH
: IGBT chips over heating protection temperature level
T
jH
: Over heating protection hysteresis
3-22
Fig.3-16
T
jOH
combined protection operation (4)~(7)
5.8 Control power supply under voltage protection (UV) operation after IGBT chips over heating
protection (
T
jOH
) operation ends (4)~(7)
the IGBT
chip surface
temperature
