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| Silicore 2.3W DUAL AUDION POWER AMP DESCRIPTION The CD2025B is a monolithic integrated circuit consisting of a 2-channel po wer amplifier. It is suitable for stereo and bridge amplifier application of radio cassette tape recorder. CD2025B Outline Drawing FEATURES High ou tput power Stereo: Po=2.3W (Typ) at Vcc=9V, RL=4 Bridge: Po=4.7W (Typ) at Vcc=9V, RL=8 Low switching distortion at high frequency. Small shock noise at th e time of power on/off due to a built-in mu ting circuit Good ripple rejection due to a built-in ripple filter. Good ch annel separation. Soft tone at the time of output saturation. Closed loop voltage gain fixed 45 d B (Bridge: 51dB) but availability with external resistor added. Minimu m nu mb er of external parts required. Easy to design radiator fin. BLOCK DIAGRAM AND PIN CONNECTION PRE GND 7 IN1 8 NF1 POWER GND 9 Fin INPUT AMP 1 + BS1 10 OUT1 11 Vcc 12 SHOCK NOISE REJECTOR OUT AMP 1 RIPPLE FILTER INPUT AMP 2 + 6 R.R 5 IN2 OUT AMP 2 4 Fin 3 NF2 POWER GND BS2 2 OUT2 1 BTL OUT SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 1/3 CHMC Silicore ABSOLUTE MAXIMUM RATINGS (Ta=25C) Characteristic Supply Vo ltage Power Diss ipation Operating Te mperature Storage Temp erature *Fin is soldering on the PCB Symbol Vcc PD Topr Tstg CD2025B Value 15 4* -20~70 -40~150 Unit V W C C ELECTRICAL CHARACTERISTICS (unless otherwise specified: Ta=2 5C, Vcc=9V; Rg=6 00 ,f=1kHz) Characteristics Operating Supply Vo ltage Quiescent circuit current Closed loop Vo ltage Gain Channel Balance Output Power Stereo Vi=0V, Stereo Stereo Bridge Stereo THD=10%, RL=4 THD=10%, RL=8 Po Vi=-45dBm Test conditions Symbol Min. Typ. Max. Unit Vcc ICC Q Gvc CB 43 49 -1 1.7 9 40 45 51 0 2.3 1.3 4.7 THD Ri Stereo, Rg =0, Vi=150mW f=100Hz Stereo Rg=0 Stereo Rg=10k Stereo Rg=10k Vo =0d B m RR VNO CT 40 21 40 0.3 0.5 30 46 0.3 0.5 55 1.0 2.0 1.5 % k dB mV dB W 11 55 47 53 +1 V mA dB dB dB Bridge THD=10%, RL=8 Total Harmonic Distortion Input Resistance Ripple Rejection Ratio Output Noise Vo ltage Cross Talk Stereo Bridge Po=250 mW RL=4 SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 2/3 CHMC Silicore BRIDGE AMPLIFIER TEST AND APPLICATION CIRCUIT INPUT 100uF 100uF 0.15uF Vcc 470uF 1000uF CD2025B 7 8 9 Fin 10 11 12 CD2025B RL 6 100uF 5 4 Fin 3 2 1 0.15uF 470uF 100uF 100uF APPLICATION INFORMATION 1. Stereo application (1) Fixed Vo ltag e gain 8 R2 + CH1 R1 Rf C1 11 (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) 9 2.Bridge application INPUT 8 R2 + CH1 R1 Rf 5K C1 10K 11 2 1 + CH2 R4 R3 4 C2 5 9 C4 RL C6 (1) Fixed voltage gain (pin 9 connected to GND directly) Gv=2 0log (R1 /R2 ) (2)Variable voltage gain Rf and C1 connected with pin 9 Gv=20 log (R1/(R2+Rf)) SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 3/3 CHMC |
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