NTE7145 Intergrated Circuit 18W BTL x 2 Ch Audio Power Amplifier Description: The NTE7145 is a stereo audio power IC in a 17–Lead Staggered SIP type package designed for car audio use. This device has 2 built–in channels to reduce the characteristics difference between L and R channels. In addition, the functions of stand–by, muting, and a variety of protections circuits are involved. Features: D High Power: POUT(1) = 18W (Typ)/Channel (VCC = 14.4V, f = 1kHz, THD = 10%, RL = 4Ω) POUT(2) = 15W (Typ)/Channel (VCC = 13.2V, f = 1kHz, THD = 10%, RL = 4Ω) D Low Distortion Ratio: THD = 0.04% (Typ) (VCC = 13.2V, f = 1kHz, POUT = 1W, RL = 4Ω, GV = 50dB) D Low Noise: VNO = 0.30mVrms (Typ) (VCC = 13.2V, RL = 4Ω, GV = 50dB, Rg = 0Ω, BW = 20Hz to 20kHz) D Built–In Stand–By Function (With Pin4 set at Low, Power is Turned OFF): ISB = 1µA (Typ) D Built–In Muting Function (With Pin1 set at Low, Power is Turned OFF): V (Mute) = 1V (Typ) D Built–In Various Protection Circuits: Thermal Shut Down Overvoltage OUT→VCC Short OUT→GND Short OUT–OUT Short D Operating Supply Voltage: VCC = 9V to 18V Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Peak Supply Voltage (0.2s), VCCsurge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V DC Supply Voltage, VCCDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25V OPerating Supply Voltage, VCCopr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Output Current (Peak), IO(peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9A Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50W Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30° to +85°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C Electrical Characteristics: (TA = +25°C, VCC = 13.2V, RL = 4Ω, f = 1kHz, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Quiescent Supply Current ICCQ VIN = 0 – 120 250 mA Output Power POUT VCC = 14.4V, THD = 10% – 18 – W THD = 10% 11 15 – W POUT = 1W – 0.04 0.4 % 48 50 52 dB Total Harmonic Distortion THD Voltage Gain GV Output Noise Voltage VNO Rg = 0Ω, BW = 20Hz to 20kHz – 0.3 0.7 mVrms Ripple Rejection Ratio RR fripple = 100Hz, Rg = 600Ω 40 54 – dB Input Resistance RIN – 30 – kΩ –0.3 0 +0.3 V – 1 10 µA – 60 – dB 2.5 – VCC V – 1.0 2.0 V Output Offset Voltage Voffset Current at Stand–By State ISB Crosstalk CT Pin4 Control Voltage V(SB) Pin1 Control Voltage V(MUTE) VIN = 0 Rg = 600Ω, VOUT = 0.775Vrms (0dBm) Stand–By→OFF (Power→ON) Mute→ON (Power→OFF) Pin Connection Diagram (Front View) 17 16 15 14 13 12 11 Power VCC2 Output 2 Output 1 GND 1 GND 2 Output 4 Output 3 10 Power VCC1 9 Pre–VCC 8 Ripple 7 Input 2 6 NF 2 5 Pre–GND 4 Stand–By Switch 3 NF 1 2 Input 1 1 Mute Switch 1.440 (36.6) .197 (5.0) 1.180 (30.0) .670 (17.0) .154 (3.9) .550 (14.0) 1 17 .394 (10.0) .197 (5.0) .079 (2.0) .079 (2.0) .101 (2.56)