MT6M15962a
© Fuji Electric Co., Ltd. All rights reserved.
5.2 Control power supply under voltage protection (UV) during startup and shutdown of power supply
The X-IPM has control power supply under voltage protection (UV) function. Because of this function,
an alarm signal is output during the startup and shutdown of the power supply.
5.2.1 During start up
When
V
CC
exceeds 5V, an alarm signal is output after the elapse of
20μs in both Case 1 (when the
inclination of
V
CC
is fast) and Case 2 (when the inclination of
V
CC
is slow).
In Case 1,
V
CC
exceeds
V
UV
+
V
H
and
V
in
becomes OFF-state before
t
ALM(UV)
elapses, thus the
protection operation is stopped after the elapse of
t
ALM(UV)
.
In Case 2, the protection operation continues even after the elapse of
t
ALM(UV)
because
V
CC
is still
below
V
UV
+
V
H
. The protection operation is stopped when
V
CC
exceeds
V
UV
+
V
H
and
V
in
is in OFF-
state.
3-14
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
(a) Case 1 When the inclination of
V
CC
is fast.
(b) Case 2 When the inclination of
V
CC
is slow.
Fig.3-8
V
CC
start up operation
