BD5471MUV Ver la hoja de datos (PDF) - ROHM Semiconductor
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BD5471MUV Datasheet PDF : 22 Pages
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BD5471MUV
Technical Note
●BEEP Detection Function
This IC has BEEP detection.
When inputting beep signal to 1pin BEEP terminal at standby mode, amplifier becomes standby to active.
When beep signal stops, amplifier becomes active to standby.
It is adjustable the time(Toff) from beep signal stop to amplifier standby by a capacitance connect to 2pin DET_C terminal.
If no need to use BEEP detection, make 1pin BEEP terminal open or connect to GND.
MUTE
BEEP
DET_C
Amplifier
state
VDD
0.2×VDD
Active
Toff
Standby
Toff calculation fomula
Toff= C×0.8VDD
5u
[msec]
Example C=0.01u, VDD=5V → Toff=8msec
C: Condenser to connect to a 2pin
Active
MUTE=H, BEEP signal input
DET_C 2V/div
MUTE=H, BEEP signal stop
OUTL+ 5V/div
BEEP 5V/div
Toff
Ton
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10/21
2010.06 - Rev.A
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