S
ilicore
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
1/3
2.3W DUAL AUDION POWER AMP CD2025B
DESCRIPTION
Outline Drawing
The CD2025B is a monolithic integrated circuit
consisting of a 2-channel power amplifier. It is suitable
for stereo and bridge amplifier application of radio
cassette tape recorder.
FEATURES
High output power
Stereo: Po=2.3W (Typ) at Vcc=9V, R
L
=4
Bridge: Po=4.7W (Typ) at Vcc=9V, R
L
=8
Low switching distortion at high frequency.
Small shock noise at the time of power on/off due to a built-in muting circuit
Good ripple rejection due to a built-in ripple filter.
Good channel separation.
Soft tone at the time of output saturation.
Closed loop voltage gain fixed 45dB (Bridge: 51dB) but availability with external
resistor added.
Minimum number of external parts required.
Easy to design radiator fin.
BLOCK DIAGRAM AND PIN CONNECTION
-
+
INPUT
AMP 1
SHOCK NOISE
REJECTOR
-
+
INPUT
AMP 2
OUT
AMP 1
OUT
AMP 2
RIPPLE FILTER
1
12
2
3
4
5
6
7
8
9
10
11
Fin
Fin
PRE GND
IN1
NF1 POWER GND
BS1
OUT1
Vcc
BTL OUT
OUT2
BS2
POWER GND
NF2
IN2
R.R
Silicore
CD2025B
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
2/3
ABSOLUTE MAXIMUM RATINGS (Ta=25
C)
Characteristic Symbol
Value
Unit
Supply Voltage
Vcc
15
V
Power Dissipation
P
D
4*
W
Operating Temperature
Topr
-20~70
C
Storage Temperature
Tstg
-40~150
C
*Fin is soldering on the PCB
ELECTRICAL CHARACTERISTICS
(unless otherwise specified: Ta=25
C, Vcc=9V; Rg=600,f=1kHz)
Characteristics Test
conditions
Symbol Min.
Typ.
Max. Unit
Operating Supply Voltage
Vcc
9
11
V
Quiescent circuit current
Vi=0V, Stereo
I
C C Q
40 55
mA
Stereo Vi=-45dBm
43
45
47
dB
Closed loop Voltage Gain
Bridge
Gvc
49 51 53 dB
Channel Balance
Stereo
CB
-1
0
+1
dB
THD=10%, R
L
=4
1.7 2.3
Stereo
THD=10%, R
L
=8
1.3
Output Power
Bridge THD=10%, R
L
=8
Po
4.7
W
Stereo
0.3
1.5
Total Harmonic
Distortion
Bridge
Po=250mW
R
L
=4
THD
0.5
%
Input Resistance
Ri
21
30
k
Ripple Rejection Ratio
Stereo, Rg=0
,
Vi=150mW f=100Hz
RR 40 46 dB
Stereo Rg=0
0.3
1.0
Output Noise Voltage
Stereo Rg=10k
V
N O
0.5
2.0
mV
Cross Talk
Stereo Rg=10k
Vo=0dBm
CT 40 55 dB
Silicore
CD2025B
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
3/3
BRIDGE AMPLIFIER TEST AND APPLICATION CIRCUIT
1
2
3
100uF
0.15uF
0.15uF
100uF
1000uF
Vcc
R
L
Fin
4
5
6
100uF
100uF
470uF
470uF
12
11
10
Fin
9
8
7
100uF
INPUT
CD2025B
APPLICATION INFORMATION
1.
Stereo application
(1)
Fixed Voltage gain
(Pin 9 connected to GND directly )
Gv=20 log( R1/R2)
(2)
Variable voltage gain
(Rf and C, Connected with pin 9)
Gv=20 log (R1/(R2+Rf)
2.Bridge application
+
-
CH1
R2
R1
8
11
9
Rf
C1
+
-
CH2
R3
R4
2
5K
10K
C4
RL
C6
1
5
4
C2
INPUT
(1) Fixed voltage gain (pin 9 connected to GND directly)
Gv=20log (R1/R2)
(2)Variable voltage gain Rf and C1 connected with pin 9
Gv=20 log (R1/(R2+Rf))
+
-
CH1
R2
R1
8
11
9
Rf
C1
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