BD5471MUV 查看數據表（PDF） - ROHM Semiconductor

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BD5471MUV

Analog Input Stereo Class-D Speaker Amplifier

ROHM Semiconductor 

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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