Technical Note
18/30
BD5446EFV
www.rohm.com
2010.05 - Rev.B
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2) Under voltage protection
This IC has the under voltage protection circuit that make speaker output mute once detecting extreme drop of the power
supply voltage.
Detecting condition – It will detect when MUTE pin is set High and the power supply voltage becomes lower than 8V.
The speaker output is muted through a soft-mute when detected.
Releasing condition – It will release when MUTE pin is set High and the power supply voltage becomes more than 9V.
The speaker output is outputted through a soft-start when released.
OUT1P (50, 51pin)
VCCA (25pin)
Speaker output
ERROR (24pin)
OUT_DAC2 (22pin)
OUT_DAC1 (23pin)
9V
8V
HiZ-Low
Soft-mute
43msec(fs=48kHz)
3.3V
VCCP1 (53, 54pin)
VCCP2 (28, 29pin)
OUT1N (43, 44pin)
OUT2N (38, 39pin)
OUT2P (31, 32pin)
t
t
t
t
t
Soft-start
43msec(fs=48kHz)
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