128452_etc_cd2025b
TRANSCRIPT
-
7/30/2019 128452_ETC_CD2025B
1/3
Silicore
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. I t is suitable
for stereo and bridge amplifier application of radio
cassette tape recorder.
FEATURES
z High output powerStereo: Po=2. 3W (Typ) at Vcc=9V, R L=4
Bridge: Po= 4.7W (Typ) at Vcc=9V, R L=8
z Low switching distortion at high frequency.z Small shock noise at the time of power on/off due to a built- in muting circuitz Good ripple rejection due to a built- in ripple filter.z Good channel separation.z Soft tone a t the t ime of output sa turat ion.z Closed loop voltage gain f ixed 45dB (Bridge: 51dB) but availabil i ty with external
resistor added.
z Minimum number of external parts required.z Easy to design radia tor f in.BLOCK DIAGRAM AND PIN CONNECTION
-
+
INPUTAMP 1
SHOCK NOISEREJECTOR
-
+
INPUTAMP 2
OUTAMP 1
OUTAMP 2
RIPPLE FILTER
1
12
23456
7 8 9 10 11Fin
Fin
PRE GND IN1 NF1 POWER GND BS1 OUT1 Vcc
BTL OUTOUT2BS2POWER GNDNF2IN2R.R
-
7/30/2019 128452_ETC_CD2025B
2/3
Silicore CD2025B
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
2/3
ABSOLUTE MAXIMUM RATINGS (Ta=25 C)
Characteristi c Symbol Value Unit
Supply Voltage Vcc 15 V
Power Dissipation PD 4* W
Operating Temperature Topr -20~70 C
Storage Temperature Tstg -40~150 C
*Fin is solder ing on the PCB
ELECTRICAL CHARACTERISTICS
(unless otherwise specified: Ta=25 C, Vcc=9V; Rg=600 ,f=1kHz)
Charac ter i s t ic s Tes t condi t ions Symbol Min. Typ. Max. Uni tOperating Supply Voltage Vcc 9 11 V
Quiescent circuit current Vi=0V, Stereo ICC Q 40 55 mA
Stereo Vi=-45dBm 43 45 47 dBClosed loo p Voltage Gai n
BridgeGvc
49 51 53 dB
Channel Balance Stereo CB -1 0 +1 dB
THD=10%, RL=4 1.7 2.3Stereo
THD=10%, RL=8 1.3Output Power
Bridge THD=10%, RL=8
Po
4.7
W
Stereo 0.3 1.5Total HarmonicDistor t ion Bridge
Po=250mW
RL=4 THD
0.5%
Input Resistance Ri 21 30 k
Ripple Rejection RatioStereo, Rg=0 ,
Vi=150mW f=100HzRR 40 46 dB
Stereo Rg=0 0 .3 1.0Output No ise Voltage
Stereo Rg=10k VN O
0 .5 2.0mV
Cross Talk Stereo Rg=10k Vo=0dBm CT 40 55 dB
-
7/30/2019 128452_ETC_CD2025B
3/3
Silicore CD2025B
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
3/3
BRIDGE AMPLIFIER TE ST AND APPLICATION CIRCUIT
123
100uF
0.1
5uF
0.1
5uF
100uF
1000uF
Vcc
RL
Fin456
100uF
100uF
470uF
470uF121110Fin987
100uFINPUT
CD2025B
APPLICATION INFORMATION
1. Stereo application(1) Fixed Voltage gain(Pin 9 connected to GND direct ly )
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
+
-
CH1R2
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 direct ly)
Gv=20log (R1/R2)
(2)Variable voltage gain Rf and C1 connected with pin 9
Gv=20 log (R1/(R2+Rf))
+
-
CH1R2
R1
8
11
9
Rf
C1