MT6M15962a
V
CC
: Supply voltage of pre-driver
V
UV
: Under voltage protection level
V
H
: Under voltage protection hysteresis
V
in
: Input signal voltage
V
ALM
: Alarm signal voltage
t
ALM(UV)
: Alarm signal hold time
© Fuji Electric Co., Ltd. All rights reserved.
3-15
(a) Case 3 When the inclination of
V
CC
is fast.
(b) Case 4 When the inclination of
V
CC
is slow.
Fig.3-9
V
CC
shutdown operation
5.2.2 During Shutdown
When
V
CC
falls below
V
UV
, an alarm signal is output after the elapse of
20μs in both Case 3 (when the
inclination of
V
CC
is fast) and Case 4 (when the inclination of
V
CC
is slow).
In Case 3, the alarm signal output is stopped before the elapse of
t
ALM(UV)
because
V
CC
falls below 5V
and the control IC does not operate normally.
In Case 4, the protection operation continues after the elapse of
t
ALM(UV)
because
V
CC
still exceeds 5V.
However, when
V
CC
falls below 5V, the control IC does not operate normally and
V
ALM
changes to
V
CC
equivalent.
