TIGER ELECTRONIC CO.,LTD TBA820M 1.2W AUDIO POWER AMPLIFIER TBA820M GENERAL DESCRIPTION The TBA820M is a monolithic integrated circuit in 8 lead dual in -line plastic packag e. It is intended for use a slow frequency class B power amplifier in portable cassette players and radios. FEATURES Wide range of supp ly voltage : Vcc=3V~16V in portable radios, cassette recorders and players etc. Main features are : minimum working supply voltage of 3V Outline Drawing Low quiescent supply current ( Icc=4mA , typical) Good ripple rejection Low number of external components No crossover distortion Low power dissipation Output Power : Po=2W at 12V/8Ω , 1.6W at 9V/4Ω and 1.2W at 9V/8Ω BLOCK DIAGRAM PIN CONNECTION Ripple Bootstrap Vcc OUTPUT 7 5 8 6 - Frequency Compensation 1 8 Ripple Rejection Gain Setting 2 7 Bootstrap Input 3 6 Supply Voltage Ground 4 5 Output TBA820M + 1 2 3 4 CB NF INPUT GND TBA820M ABSOLUTE MAXIMUM RATINGS Characteristics Symbol Value Unit Supply Voltage Vcc 16 V Peak Output Current Ipk 1.5 A Power Dissipation(at Tamb =50 °C) PD 1.25 W Operating Temperature Topr -20~70 °C Storage Temperature Tstg -40~150 °C THERMAL DATA Characteristics Symbol Value Unit Thermal resistance junction-ambient Rth(j-a) 100 °C/W ELECTRICAL CHARACTERISTICS ( Unless otherwise specified Vcc=9V,Tamb=25°C) Characteristic Symbol Test Condition Min. Typ. Max. Unit Supply Voltage Quiescent Output Voltage(pin 5) Quiescent Drain Current Bias current (pin 3) Vcc 3 Vo 4 16 V 4.5 5 V Id 4 12 mA Ib 0.1 Vcc=12V;R L =8 Ω Output Power Po Vcc=9V;R L =4 Ω THD=10% Vcc=9V;R L =8 Ω f=1kHz Vcc=6V;R L =4 Ω Rf=120Ω Vcc=3.5V;R L =4 Ω Vcc=3V;R L =4 Ω Po=1.2W f=1kHz Input sensitivity Vi(rms) R L =8 Ω Po=50mW R L =8 Ω f=1kHz Input resistance(pin 3) Ri f=1kHz Frequency response (-3dB) B R L =8 Ω Rf=120Ω C5=1000µF µA 2 1.6 0.9 1.2 0.75 W 0.25 0.2 Rf=33Ω 16 Rf=120Ω 60 Rf=33Ω 3.5 Rf=120Ω 12 5 C B =680pF 25 to 7000 C B =220pF 25 to 20000 mV mV MΩ Hz TBA820M ELECTRICAL CHARACTERISTIVCS ( Unless otherwise specified Vcc=9V,Tamb=25°C) Characteristic Symbol Distortion THD Continue Test Condition Po=500 mW R L =8Ω f=1kHz Vo ltage Gain (open loop) Gv R L =8Ω f=1kHz Vo ltage Gain (closed loop) Gv R L =8Ω f=1kHz Input noise Voltage Min. Typ. Max. Unit Rf=33Ω 0.8 Rf=120Ω 0.4 % 75 dB Rf=33Ω 45 Rf=120Ω 34 VN Vcc=9V,B(-3dB)=25~20000Hz 3 µA Input noise current IN Vcc=9V,B(-3dB)=25~20000Hz 0.4 nA R1=10kΩ 80 Signal to noise ratio (*) S+N/N Supply voltage rejection (test circuit of 2) Po=1.2W Gv=34dB R L =8Ω dB dB R1=50kΩ R L =8Ω f(ripple)=100Hz C6=47 µF Rf=120 Ω SVR (*) B(-3dB)=25~20000Hz TEST CIRCUIT C6 6 C4 8 3 Vi 7 0.1uF C2 100uF/15V 47uF/10V 1. Circuit diagram with load connected to the supply voltage 1 Vcc RL CB C5 TBA820M 2 5 R1 10K Rf C1 100uF/6V 4 R2 1 220uF/15V C3 0.22uF 70 42 dB TBA820M 2. Circuit diagram with load connected to ground 100uF/15V C4 6 3 Vi 7 CB 1 Rf C1 100uF/6V 4 C6 C5 220uF/15V R2 1 47uF/10V 85 C3 0.22uF 2 C7 100uF/15V TBA820M R1 10K Vcc 0.1uF R3 56 C2 CHARACTERISTICS CURVES RL TBA820M