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BD5471MUV-E2

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Technical Note
10/21
BD5471MUV
www.rohm.com
2010.06 - Rev.A
© 2010 ROHM Co., Ltd. All rights reserved.
●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.
Toff calculation fomula
DET_C 2V/div
OUTL+ 5V/div
BEEP 5V/div
MUTE=H, BEEP signal input MUTE=H, BEEP signal stop
Toff
Ton
Toff=
C×0.8VDD
5u
C: Condenser to connect to a 2pin
[msec]
Example C=0.01u, VDD=5V → Toff=8msec
Toff
MUTE
BEEP
DET_C
Amplifier
state
Active
0.2×VDD
Active
Standby
Active
VDD
Technical Note
11/21
BD5471MUV
www.rohm.com
2010.06 - Rev.A
© 2010 ROHM Co., Ltd. All rights reserved.
●Cntrol Terminal and output
Input Output
MUTE EAPD BEEP Audio IN Amplifier state Speaker output
L L L No signal L(Shutdown) Hiz
L L L signal L(Shutdown) Hiz
L L H No signal L(Shutdown) Hiz
L L H signal L(Shutdown) Hiz
L H L No signal L(Shutdown) Hiz
L H L signal L(Shutdown) Hiz
L H H No signal L(Shutdown) Hiz
L H H signal L(Shutdown) Hiz
H L L No signal L(Standby) Hiz
H L L signal L(Standby) Hiz
H L H No signal H(Active) No signal
H L H signal H(Active) signal
H H L No signal H(Active) No signal
H H L signal H(Active) signal
H H H No signal H(Active) No signal
H H H signal H(Active) signal
Audio IN
[ Input ]
EAPD
[ Input ]
BEEP
[ Input ]
MUTE
[ Input ]
Amplifier state
Speaker output
Active Active
Standby Standby Standby Shutdown
Audio Signal Beep Signal Audio Signal Beep Signal Audio Signal
In case of EAPD=L,
it doesn’t output.
Equal to or more than
0.125sec.
Beep Signal
f=300~1760Hz
3.3msec 570usec
Amplifier is a standby.
The current consumption reduces.
The current consumption
in the audio part is zero.
It detects that
BEEP was inputted.
It makes an amplifier state to
standby mode if BEEP isn’t
inputted equal to or more than 3.3msec.
Technical Note
12/21
BD5471MUV
www.rohm.com
2010.06 - Rev.A
© 2010 ROHM Co., Ltd. All rights reserved.
●About output starting and stop
This IC has the cuircuit of pop noise reduction at starting and stop.
Pop noise reduction is realized in controlling to adjust the timing of output at starting and stop.
Turn on time is 1msec.
●About the short protection
Output starting (MUTE=H, EAPD=L→H)
Ton=1msec
Output stop (MUTE=H, EAPD=H→L)
EAPD
5V/div
OUTL+
5V/div
OUTL-
5V/div
H－
Bridge
Short
Protection
Short
Protection
OUTL+
H－
Bridge
OUTL－
OUTR+
OUTR－
When detecting a short of Lch output,
Lch output stops, and Rch output stops.
Also when detecting a short of Rch output,
Rch output stops, and Lch output stops.
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BD5471MUV-E2

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Description:
Audio Amplifiers IC STEREO SP. AMP CLASS D
Lifecycle:
New from this manufacturer.
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