BD7830NUV Rohm, BD7830NUV Datasheet - Page 11

• Manufacturer Part Number: BD7830NUV
• Description: 1.1W to1.5W Monaural Speaker Amplifier
• Manufacturer: Rohm

●Mechanism of pop sounds
BD7830NUV
© 2010 ROHM Co., Ltd. All rights reserved.
www.rohm.com
Cin is low
Gain is low
(Rf)
Cin is high
Gain is high
(Rf)
600
Cin
Ri
1μ
C
S
STBY
BIAS
SOFT
BIAS
IN-
SOFT
IN－
STBY
OUT
BIAS
IN-
SOFT
STBY
OUT
1
2
3
4
SOFT
Bias
BIAS
About
About 25
2nd Amp
1st Amp
25 ms
Rf
IN-
BIAS
IN-
POP sounds
OUT2
8
GND
7
VCC
6
OUT1
5
No pops
0.6 VCC
0.6 VCC
1μ
11/17
VCC
difference
Potential
R
L
When SOFT voltage reaches 0.6 VCC, if there
is a potential difference between BIAS and IN-,
pop sounds will occur.
At startup, the input coupling Cin is charged
from output OUT via the feedback resistance
Rf, so when
Cin and Rf are high, charging takes longer and
pop sounds can easily occur.
The rise of the SOFT voltage is changed by C
so pop sounds an be reduced by setting C
high.
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Technical Note
2010.06 - Rev.A
S,
S