UTC8227 LINEAR INTEGRATED CIRCUIT LOW FREQUENCY POWER AMPLIFIER DESCRIPTION The UTC8227 is the audio power amplifier with built-in two channel developed for portable radio cassette tape recorder with power ON/OFF switch. FEATURES *Wide operating supply voltage: Vcc=5~12V *Low quiescent supply current (Icc=21mA,typical,at Vcc=9V ,Vi=0) *Output power HDIP-12 Po=2.50W/CH at Vcc=9V,RL=4ohm ,f=1kHz,Thd=10% *Soft Clip *Built-in Thermal shut-down protection circuit *Stand-by Switch TEST CIRCUIT Vcc2 1000µF 100µF SW1 Vcc1 1 12 3 100µF Input 1 Boot strap 1 6 45Ω 0.015µF 5 30kΩ 10 Output 1 RL Boot strap 2 7 Input 2 8 45Ω 120Ω 30kΩ TAB Pre GND 1000µF Output 2 11 0.015µF NF2 47µF 1000µF 9 100µF Ripple 47µF 47µF NF1 120Ω 2 RL 4 Power GND YOUW ANG ELECTRONICS CO.LTD 1 UTC8227 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS(Ta=25°C) Characteristic Symbol Value Unit Supply Voltage Vcc 20 V Output Current Io 2.5 A Power Dissipation(note) Pd 4 W Operating Temperature Topr -20 ~ +75 °C Storage Temperature Tstg -55 ~ +150 °C Note: Value for mounting on PC board ELECTRICAL CHARACTERISTICS (Ta=25°C,Vcc=9V,RL=4Ω,Rg=600Ω,f=1kHz,unless otherwise specified) Characteristic Symbol Quiescent current Icc Output Power Po Total Harmonic Distortion THD Voltage Gain Test Conditions Min Typ Max Units 21 45 mA 2.0 2.5 Vi=0 THD=10%,RL=4Ω THD=10%,RL=3Ω 3.0 Po=0.4W/CH 0.2 1.0 % 45 47 dB 1.0 mVrms Gv1 Rf=120Ω,Vout=0.775Vrms Gv2 Rf=0,Vout=0.775Vrms 56.5 43 Input Impedance Rin Output Noise Voltage Vno Rg=10kΩ,BW=20Hz~20kHz 0.3 Ripple Rejection Ratio R.R Rg=600Ωfripple=100Hz 52 Cross Talk C.T Rg=600Ω,Vout=0, f=1kHz 50 Input Offset Voltage V7,8 Standby Current W W Ω 30 30 Sw1:OFF YOUW ANG ELECTRONICS CO.LTD 1 dB dB 60 mV µA 2 UTC8227 LINEAR INTEGRATED CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS ICCQ, V2,V10 vs. VCC1 THD vs Output Power ICCQ 12 9 9 6 6 V10,V2, 3 Output Voltage (V) Vcc1=12V Vin=0 Ta=25k 12 3 0 0 0 3 6 9 12 Cross Talk vs. Frequency 10 Vcc=9V RL=4Ω RNF=120Ω Rg=620Ω Vout=0dBm 6V 1 Vcc1=9V RL=4Ω f=1kHz RNF=120Ω Ta=25k Vcc2=5V 0 9V Cross Talk (dB) 15 Total Harmonic Distortion (%) Quiescent current (mA) 15 -20 -40 -60 0.1 15 -80 0.01 Supply Voltage , Vcc2 (V) ICCQ, DC Vout vs. Supply Voltage 0.1 1 1 10 10 2 10 3 10 4 10 Output Power (W) Frequency ( Hz) Voltage Gain vs. Frequency Ripple Rejection vs. frequency 5 10 20 100 Vout 8 40 ICCQ 20 0 0 5 10 15 20 Voltage Gain (dB) 12 60 Vcc=9V RL=4Ω RNF=120Ω 80 60 40 4 20 0 0 25 Supply Voltage , Vcc2 (V) Vcc=9V RL=4Ω RNF=120Ω Rg=620Ω 0 Voltage Gain (dB) 16 Output Voltage (V) Quiescent current (mA) Vin=0 80 -20 -40 -60 -80 1 10 2 10 3 10 4 10 5 10 Frequency ( Hz) 1 10 2 10 3 10 4 10 5 10 Frequency ( Hz) APPLICATION INFORMATION 1.Input Voltage When the excessive signal is input, turning-up is produced in the clip waveform. The turning-up point is Vin=300mVrms(Typical) at Vcc=9V,RL=4Ωf=1kHz. Enough care must be taken for this phenomenon. 2.Power ON/OFF There is power ON/OFF switch at pin 1. However output power is changed by pin 1 supply voltage when pin1 supply voltage is not same pin 12 supply voltage, after referring to attached date, select pin 1 supply voltage. 3.Voltage Gain The voltage gain can be changed by the external negative feedback resistor. When Rf=0, the Gain is equal to 56.5dB.When Rf=120Ωthe Gain is equal to 45dB. YOUW ANG ELECTRONICS CO.LTD 3