ICs for Audio Common Use AN7148 Dual 2.1W Audio Power Amplifier Circuit ■ Overview Unit : mm The AN7148 is an integrated circuit designed for power amplifier of 2.1W (9V, 4Ω) output. Stereo operation is enabled due to incorporating two amplifiers on one chip. It is most suitably used for battery operated set such as radio cassette recorder because quiescent circuit current is small comparing to current power amplifier. Low distortion and low noise are realized and external components are very few. 12-pin SIL package has realized compact and high density mounting of a set. 5.9±0.25 7.7±0.3 7.8±0.25 ø 3.6 Pin No. Pin Name Pin No. N.F.B Ch.1 7 Output Ch.2 2 Input Ch.1 8 Bootstrap Ch.2 3 Ripple Filter 9 GND (Output) 4 GND (Input) 10 VCC 5 Input Ch.2 11 Bootstrap Ch.1 6 N.F.B Ch.2 12 Output Ch.1 ■ Block Diagram 1 11 Driver Circuit Output Circuit 12 Ch.1 Over Temperature Protection 3 10 VCC Ch.2 5 Input Circuit 6 Pin Name 1 Input Circuit 29.6±0.3 12-Lead SIP Package with Fin (HSIP012-P-0000A) ■ Pin Descriptions 2 3.5±0.3 1.2±0.1 1 + 0.1 0.35 – 0.05 2.54 ■ Features • Low quiescent current • High operation stability • Low radiation • Low distortion • Low noise • Low shock noise from power ON/OFF operation • Fewer external components 0.6 R1.8 0.6±0.1 29.96±0.3 28.0±0.3 20.0±0.2 12 Driver Circuit Output Circuit 4 9 GND (Input) GND (Output) 8 7 ICs for Audio Common Use AN7148 ■ Absolute Maximum Ratings (Ta= 25˚C) Parameter Symbol Rating Unit VCC 24 V Supply Voltage Supply Current ICC 3.5 A Power Dissipation PD * 41.7 W Operating Ambient Temperature Topr – 30 ~ + 75 ˚C Storage Temperature Tstg – 55 ~ + 150 ˚C * R θ j – c = 3˚C/W ■ Electrical Characteristics (Ta = 25˚C) Parameter Quiescent Circuit Current Symbol Condition ICQ VCC = 9V, RL = 4Ω, Vin = 0mV VCC = 9V, RL = 4Ω, Vin = 0mV, Rg = 10kΩ VCC = 9V, RL = 4Ω, Vin = 3mV, f = 1kHz VCC = 9V, RL = 4Ω, Vin = 3mV, f = 1kHz VCC = 9V, RL = 4Ω, THD = 10%, f = 1kHz VCC = 9V, RL = 4Ω, Vin = 3mV, f = 1kHz VCC = 9V, RL = 8Ω, THD = 10%, f = 1kHz VCC = 9V, RL = 3Ω, THD = 10%, f = 1kHz Output Noise Voltage Vno * Voltage Gain (Gain) GV Total Harmonic Distortion THD Maximum Output Power (4Ω) PO (max.) Channel Balance CB Maximum Output Power (8Ω) PO (max.) 8 Maximum Output Power (3Ω) PO (max.) 3 min. Note) Operating Supply Voltage Range : VCC (opr.) = 6 ~ 18V * Filter with band width of 15Hz ~ 30kHz (12dB/oct) should be used for Vno measurement. PD – Ta 50 45 41.7W Power Dissipation PD (W) 40 (1) 35 (1) Tc = Ta (θj– c = 3˚C/W) (2) With a 100cm2 × 3mm Al heat sink (black color coated) or a 200cm2 × 2mm Al heat sink (not lacquered) (3) With a 100cm2 × 2mm Al heat sink (not lacquered) (4) Without heat sink 30 25 20 17.9W 13.9W 15 (3) 10 5 0 (2) 3.0W 0 (4) 25 50 75 100 125 Ambient Temperature Ta (˚C) 150 42.5 1.75 typ. max. Unit 13 19 mA 0.25 0.50 mV 44.5 46.5 dB 0.20 0.75 % W 2.10 0 1 dB 1.25 W 2.6 W ICs for Audio Common Use AN7148 PO, THD – Vin 0.6 ICQ 0.4 10 THD 0.2 5 0 4 8 12 16 0 24 20 Output Power PO (W) 0.8 15 10 1 44 0.1 THD PO 0.01 0.001 0.1 1 PO – VCC 42 1.0 41 0.8 0.6 0.4 0.01 100 10 10 THD = 10% f = 1kHz VCC = 9V RL = 4Ω 1.4 Output Noise Voltage Vno (mV) 14 12 10 RL = 3Ω 8 6 RL = 4Ω 4 1.2 1.0 0.8 0.6 FLAT 0.4 DIN/Audio 0.2 2 0 4 8 12 16 20 0 0.1k 24 1k 10k 100k 1000k Input Resistance Rg (Ω) Supply Voltage VCC (V) ■ Application Circuit VCC – + 1000µF 100µF + – 1000µF – + 3 10 0.1µF 11 1 47µF 2 + – 12 Input Ch.1 2.2Ω 1000µF + – + – AN7148 7 5 Input Ch.2 47µF – 6 100µF + – 8 4 100 THD 1k 0.2 10k Frequency f (Hz) Vno – Rg 1.6 16 Output Power PO (W) 43 Input Voltage Vin (mV) 20 0 0.1 GV 44 VCC = 9V RL = 4Ω Vin = 3mV Supply Voltage VCC (V) 18 1 45 1000µF + 0.1µF 9 2.2Ω 0 100k Total Harmonic Distortion THD (%) f = 1kHz RL = 4Ω Total Harmonic Distortion THD (%) Voltage Gain GV (dB) VCC = 9V RL = 4Ω f = 1kHz GV 45 0 GV, THD – f 100 10 Total Harmonic Distortion THD (%) Quiescent Circuit Current ICQ (mA) Voltage Gain GV (dB) GV, ICQ, THD – VCC 46 ICs for Audio Common Use AN7148 ■ Printed Circuit Board Layout AN7148 Output2 – + Input2 0.1µF GND – + 100µF 100µF – + 100µF 2.2 Ω – + 47µF Input1 1 Output1 1000µF µF + – – + 0.1 2.2Ω 1000µF VCC + – + – 47µF 12 1000µF GND