ICs for Audio Common Use
s
Overview
The AN7135 is a power amplifier circuit of 7.5W (15.0V,
3
) output. It can provide stereo operation since two
amplifiers are incorporated in a chip. Static circuit current
is very smaller than conventional IC for power amplifier,
and various protective circuits are incorporated, thus pro-
viding high reliability. For its feature of very small static
circuit current, it is best suitable for dry cell operating sets
(e.g. radio cassette recorder). It requires smaller number
of external components because it has little distortion and
low noise and can support the stand-by condition.
s
Features
Small static circuit current
Stand-by condition supported
Good oscillation stability
Little unwanted radiation to RF portion of AM/FM
Little distortion
Low noise
Small shock noise at power ON/OFF, stand-by ON/OFF
Fewer external components
AN7135
Dual 7.5W Low Frequency Power Amplifier Circuit
29.96
0.3
29.6
0.3
12
1
Unit : mm
28.0
0.3
20.0
0.2
5.9
0.25 7.7
0.3 7.8
0.25
1.2
0.1
2.54
0.6
0.1
3.5
0.3
0.35
+ 0.1
0.05
3.6
R1.8
Fin-attached 12-lead SIP package (HSIP012-P-0000A)
0.6
Input Circuit
Bias Circuit
Drive Circuit
SEPP
Output Circuit
Input Circuit
Drive Circuit
SEPP
Output Circuit
Over Temperature
Protection
Crossover
Distortion
3
9
4
10
1
6
5
2
11
8
7
12
V
CC
GND
(Output)
GND
(Input)
s
Block Diagram
ICs for Audio Common Use
AN7135
Pin No.
Pin Name
1
2
3
4
5
6
Negative Feedback Ch.1
Input Ch.1
Ripple filter/Stand-by Controller
GND (Input)
Input Ch.2
Negative Feedback Ch.2
s
Pin Name
Pin No.
Pin Name
7
8
9
10
11
12
Output Ch.2
Boot-strap Ch.2
GND (Output)
V
CC
Boot-strap Ch.1
Output Ch.1
s
Absolute Maximum Ratings
(Ta= 25C)
V
CC
I
CC
P
D
T
opr
T
stg
Supply Voltage
Supply Current
Power Dissipation
Note 1)
Operating Ambient Temperature
Storage Temperature
V
A
W
C
C
Parameter
Symbol
Rating
Unit
24
4
62.5
30 ~ + 75
55 ~ + 150
Note)
jc
= 2C/W
Parameter
Symbol
Range
s
Recommended Operating Range
(Ta= 25C)
Operating Supply Voltage Range
V
CC
5.5V ~ 18.0V
Note) 24V at no signals
Parameter
Symbol
Condition
min.
typ.
max.
Unit
s
Electrical Characteristics
(V
CC
= 15V, f
IN
= 1kHz, R
L
= 3
, Both channel drive, Ta= 25C
2C)
Quiescent Current
Output End Noise Voltage
Note 1)
Voltage Gain
Total Harmonics Distortion
Max. Output Power
Channel Balance
mA
mV
dB
%
W
dB
V
IN
= 0mV
V
IN
= 0mV, R
g
= 10k
V
IN
= 3mV
V
IN
= 3mV
THD= 10%
V
IN
= 3mV
I
CQ
V
NO
G
V
THD
P
O
CB
Input Offset Voltage
Stand-by Current
Ripple Rejection Ratio
Note 1)
RR
Input pin open
Pin3 open
V
CC (ripple)
= 280mV, f
(ripple)
= 120Hz
R
g
= 0
Sine wave
V
IN (O.S)
I
STB
42.5
7.0
1
14
0.25
44.5
0.40
7.5
0
20
0.50
46.5
0.75
45
50
+ 1
10
30
30
dB
mV
A
Note 1) Measured through 15Hz to 30kHz (12dB/OCT) filter
ICs for Audio Common Use
AN7135
3
10
2
1
5
6
4
9
11
12
8
7
+
+
30k
150
30k
150
3
(20W)
3
(20W)
2.2
0.1
F
2.2
0.1
F
1000
F
47
F
1000
F
47
F
BS1
OUT1
BS2
OUT2
V
CC
(15V)
1000
F
V
CC
R.F
&
STB
IN1
IN2
NF2
NF1
10k
100
F
100
F
100
F
30k
390
V
STB
s
Application Circuit
+
+
+
+
+
+
(Standard Conditions)
V
CC
= 15V
R
L
= 3
f
IN
= 1kHz
V
IN
= 10mV or 3mV
R
g
= 600
V
STB
= 5.0V
Both Ch. Drive
With heat sink
Tr for stand-by SW
NPN 2SC828A
PNP 2SA564A
V
O
1
V
O
2
+
80
70
60
50
40
30
20
10
0
Ambient Temperature Ta (C)
P
o
w
e
r
D
i
s
s
i
p
a
t
i
o
n
P
D
(
W
)
40
80
60
100
120
140
20
(30)
(15.63)
(3.0)
(20.83)
(62.50)
(a)
(b)
(c)
(d)
0
160
P
D
Ta
P
D
at Ta = 25C
(a) 62.50W (
jc
= 2.0C/W)
Infinity heat sink
(b) 20.83W (
f
= 4.0C/W)
Heat sink area : 100cm
2
3mmAl
(Black lacquer coated)
200cm
2
2mmAl
(Lacquered)
(c) 15.63W (
f
= 6.0C/W)
Heat sink area : 100cm
2
2mmAl
(Not lacquered)
(d) 3.0W at Ta = 30C
(
ja
= 40C/W)
Without heat sink
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