Technical Note
20/30
BD5446EFV
www.rohm.com
2010.05 - Rev.B
© 2010 ROHM Co., Ltd. All rights reserved.
4)Output short protection(Short to the power supply)
This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuited to
the power supply due to abnormality.
Detecting condition - It will detect when MUTE pin is set High and the current that flows in the PWM output pin
becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if
detected, and IC does the latch.
Releasing method -
①
After the MUTEX pin is set Low once, the MUTEX pin is set High again.
②
Turning on the power supply again.
5) Output short protection(Short to GND)
This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuited to
GND due to abnormality.
Detecting condition - It will detect when MUTE pin is set High and the current that flows in the PWM output terminal
becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if
detected, and IC does the latch.
Releasing method –
①
After the MUTEX pin is set Low once, the MUTEX pin is set High again.
②
Turning on the power supply again.
ERROR (24pin)
MUTEX(13pin)
Short to GND
Release from short to
GND
PWM out ： IC latches with HiZ-Low.
Released from latch state.
１μsec(TYP.)
t
t
t
OUT1P (50, 51pin)
OUT1N (43, 44pin)
OUT2N (38, 39pin)
OUT2P (31, 32pin)
10A(TYP.)
Over current
t
Latch release
ERROR (24pin)
MUTEX（13pin）
Short to VCC
Release from short to VCC
PWM out ： IC latches with HiZ-Low.
Released from latch state.
１μsec(TYP.)
t
t
t
OUT1P (50, 51pin)
OUT1N (43, 44pin)
OUT2N (38, 39pin)
OUT2P (31, 32pin)
10A(TYP.)
Over current
t
Latch release
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