Technical Note
17/30
BD5446EFV
www.rohm.com
2010.05 - Rev.B
© 2010 ROHM Co., Ltd. All rights reserved.
1) High temperature protection
This IC has the high temperature protection circuit that prevents thermal reckless driving under an abnormal state for the
temperature of the chip to exceed Tjmax=150
℃
.
Detecting condition - It will detect when MUTE pin is set High and the temperature of the chip becomes 150
℃
(TYP.) or
more. The speaker output is muted through a soft-mute when detected.
Releasing condition - It will release when MUTE pin is set High and the temperature of the chip becomes 120
℃
(TYP.)
or less. The speaker output is outputted through a soft-start when released.
OUT1P (50, 51pin)
Temperature of
IC chip junction(℃)
Speaker output
OUT_DAC2 (22pin)
OUT_DAC1 (23pin)
150℃
120℃
HiZ-Low
Soft-mute
43msec(fs=48KHz)
3.3V
ERROR (24pin)
OUT1N (43, 44pin)
OUT2N (38, 39pin)
OUT2P (31, 32pin)
t
t
t
t
t
Soft-start
43msec(fs=48KHz)
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