NTE1294 Integrated Circuit Audio Power Amplifier, 1.2W Description: The NTE1294 is a monolithic integrated audio amplifier in an 8–Lead DIP type package designed for use as a low frequency class B power amplifier with a wide supply voltage range (3V to 16V) in portable radios, cassette recorders, and players etc. Features: D Minimum Working Supplu Voltage: Vs = 3V Min D Low Quiescent Current D Low Number of External Components D Good Ripple Rejection D No Cross–over Distortion D Low Power Dissipation D Output Power: Po = 2W at 12V/8Ω Po = 1.6W at 9V/4Ω Po = 1.2W at 9V/8Ω Absolute Maximum Ratings: Supply Voltage, Vs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Output Peak Current, Io . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A Power Dissipation (TA = +50°C), Ptot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C Maximum Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . 100°C/W Electrical Characteristics: (VS = 9V, TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Supply Voltage Vs 3 – 16 V Quiescent Output Voiltage (Pin5) Vo 4.0 4.5 5.0 V Quiescent Drain Current Id – 4 12 mA Bias Current (Pin3) Ib – 0.1 – µA Electrical Characteristics (Cont’d): (VS = 9V, TA = +25°C unless otherwise specified) Parameter Output Power Input Sensitivity Symbol Po Vi(rms) Test Conditions Min Typ Vs = 12V, RL = 8Ω – 2 – W Vs = 9V, RL = 4Ω – 1.6 – W Vs = 9V, RL = 8Ω 0.9 1.2 – W Vs = 6V, RL = 4Ω – 0.75 – W Vs = 3.5V, RL = 4Ω – 0.25 – W Vs = 3V, RL = 4Ω – 0.20 – W Po = 1.2W, RL = 8Ω, Ω f = 1kHz Rf = 33Ω – 16 – mV Rf = 120Ω – 60 – mV Po = 50mW, RL = 8Ω, Ω f = 1kHz Rf = 33Ω – 3.5 – mV Rf = 120Ω – 12 – mV – 5 – MΩ d = 10%, f = 1kHz, Rf = 120Ω Input Resistance (Pin3) Ri f = 1kHz Frequency Response (–3dB) B CB = 680pF RL = 8Ω, C5 = 1000µF, µ CB = 220pF Rf = 120Ω Distortion d Max Unit 25 to 7000 Hz 25 to 20000 Hz Po = 500mW, Rf = 33Ω RL = 8Ω, Ω Rf = 120Ω f = 1kHz – 0.8 – % – 0.4 – % – 75 – dB Rf = 33Ω – 45 – dB Rf = 120Ω – 34 – dB Voltage Gain (Open Loop) Gv f = 1kHz, RL = 8Ω Voltage Gain (Closed Loop) Gv RL = 8Ω, f = 1kHz Input Noise Voltage eN Note 1 – 3 – µV Input Noise Current iN Note 1 – 0.4 – nA R1 = 10kΩ – 80 – dB R1 = 50kΩ – 70 – dB – 42 – dB Signal to Noise Ratio Supply Voltage Rejection Note 1. B = 22Hz to 22kHz S+N N SVR Po = 1.2W, RL = 8Ω, Gv = 34dB, Note 1 RL = 8Ω, fripple = 100Hz, C6 = 47µF, Rf = 120Ω Pin Connection Diagram Frequency Compensation 1 8 Ripple Rejection Gain Setting 2 7 Bootstrap Input 3 6 VCC GND 4 5 Output 8 5 .256 (6.52) Max 1 4 .300 (7.62) .393 (10.0) Max .150 (3.81) .100 (2.54) .070 (1.77) Min .300 (7.62)