ICs for Audio Common Use AN7171NK, AN7176K Dual BTL 14W Audio Power Amplifier Circuits ■ Overview ø 3.6 The AN7171NK and AN7176K are ICs for power amplification of 14W (13.2V, 4Ω) output. It can provide stereo operation since two BTL amplifiers are incorporated in a chip. It incorporates various protective circuits, thus providing high reliability. The circuits can be turned on or off with supply pins energized, because the stand-by circuit is built-in. 5.9±0.25 7.7±0.3 1 1.45±0.25 1.8±0.25 (1.2) NF (Ch.1) 8 Ripple Filter 13 7 Input Circuit (Ch.1) IN 6 Input Circuit STAND-BY 5 Stand-by Circuit (Ch.2) IN 12 Input Circuit GND Output Circuit Output Circuit 4 OUT (Ch.1) (+) 3 GND 2 OUT (Ch.1) (–) 16 OUT (Ch.2) (+) 15 GND 14 OUT (Ch.2) (–) Protection Circuit Driver Circuit Input Circuit 10 Driver Circuit Driver Circuit 11 9 NF (Ch.2) NF (Ch.2) Output Circuit Driver Circuit 3.5±0.3 1.45±0.25 Fin-attached 16-lead ZIP package (EZIP016-P-0660) ■ Block Diagram NF (Ch.1) 2.66 (4.06) (0.25) 1.2±0.1 12.5±0.3 (14.1) 2.54±0.8 2.8±0.3 temperature, or against over-voltage, short-circuit between output and earth and between output and VCC, load short-circuit) • Small shock noise at power ON/OFF • Fewer external components required • Good oscillation stability 1 29.6±0.3 0.6±0.2 1.778 R1.8 20.0±0.25 0.6 29.96±0.3 28.0±0.3 16 ■ Features • Two BTL 14W outputs built-in • Stand-by circuit built-in • Various protective circuits (for VCC Unit : mm 7.8±0.5 6.33±0.5 Output Circuit ICs for Audio Common Use AN7171NK, AN7176K ■ Pin Descriptions Pin No. Pin Name Pin No. Pin Name 1 VCC 9 Negative Feedback Ch.2 2 Output Ch.1 (+) 10 GND (Input) 3 GND (Output Ch.1) 11 Negative Feedback Ch.2 4 Output Ch.1 (–) 12 Input Ch.2 5 Stand-by 13 Ripple Filter 6 Input Ch.1 14 Output Ch.2 (–) 7 Negative Feedback Ch.1 15 GND (Output Ch.2) 8 Negative Feedback Ch.1 16 Output Ch.2 (+) ■ Absolute Maximum Ratings (Ta= 25˚C) Parameter Symbol Rating Unit VCC Note 1) 24 V VCC (surge) Note 2) 50.0 V ICC 6.0 A Supply Voltage Peak Supply Voltage Supply Current PD Power Dissipation 37.5 Note 3) Note 4) W Operating Ambient Temperature Topr – 30 ~ + 75 ˚C Storage Temperature Tstg – 55 ~ + 150 ˚C Note 1) Note 2) Note 3) Note 4) When no signals Time = 0.2s Rθj – c = 2˚C/W Ta = 75˚C ■ Recommended Operating Range (Ta = 25˚C) Parameter Symbol Range Operating Supply Voltage Range VCC 8.0V ~ 18.0V ■ Electrical Characteristics (VCC = 13.2V, RL= 4Ω, f = 1kHz, Ta = 25˚C) Parameter Symbol Condition min. typ. max. Unit Quiescent Current ICQ Vin= 0mV 120 200 Output Noise Voltage Note) Vno Vin= 0mV, Rg= 10kΩ 0.60 1.50 mVrms Voltage Gain GV Vin= 5mV 52.5 54.5 Total Harmonic Distortion THD Vin= 5mV 0.20 0.75 Max. Output Power (4Ω) PO THD= 10% 9.0 12.5 W Ripple Rejection Ratio Note) RR Rg= 0Ω, Vin= 0mV, Ripple= 300mVrms, 120Hz 35 40 dB –200 0 + 200 mV –1 0 +1 dB Output Offset Voltage Channel Balance VO (offset) CB 50.5 Rg= 0Ω Vin= 5mV mA dB % THD Vin= 5mV, 100Hz 0.26 Total Harmonic Distortion THD Vin= 5mV, 10kHz 0.45 % Frequency Characteristics fCH Vin= 5mV, –3dB down 22 kHz Frequency Characteristics fCL Vin= 5mV, –3dB down Total Harmonic Distortion Stand-by Current Crosstalk ISTB Stand-by Pin ON CT Vin= 5mV, Rg= 10kΩ Note) With 15Hz to 30kHz (12dB/OCT) filter AN7171NK AN7176K 400 % 21 Hz 21 µA 650 61 1000 µA dB ICs for Audio Common Use AN7171NK, AN7176K GV, THD – f Output Power PO (W) Max. Output PO (W) 10 12 8 10 PO 1.0 1.0 0.1 0.1 THD 4 Total Harmonics Distortion THD (%) VCC = 13.2V RL = 4Ω f = 1kHz f = 1kHz THD = 10% RL = 4Ω 16 100 Voltage Gain GV (dB) PO, THD – Vin 100 54 52 GV 50 48 46 1.0 VCC = 13.2V 0.8 RL = 4Ω PO = 1W 0.6 0.4 THD 0.2 0 8 4 12 16 0.01 0.1 20 1 Supply Voltage VCC (V) 0 100k Frequency f (Hz) 48 6 46 5 44 4 42 3 40 2 38 1 THD 6 7 8 9 Supply Voltage VCC (V) 10 0 11 160 Quiescent Current ICQ (mA) 7 Total Harmonics Distortion THD (%) Voltage Gain GV (dB) 8 5 10k 9 GV 50 4 1k ICQ – VCC 52 3 100 200 10 36 10 Input Voltage Vin (mV) GV, THD – VCC f = 1kHz RL = 4Ω Vin = 3mV 0.01 100 10 Total Harmonics Distortion THD (%) PO – VCC 20 120 80 40 0 4 8 12 16 20 Supply Voltage VCC (V) ■ Precautions on use 1. Always attach an outside heat sink to use the chip. In addition, the outside heat sink must be fastened onto a chassis for use. 2. Connect the radiation fin to the GND potential. 3. Prevent atmospheric and ground faults, and load short-circuit. 4. The temperature protective circuit gets actuated when Tj = approx. 150˚C, but it is automatically reset when the chip temperature drops below the above set level. 5. The overvoltage protective circuit starts the protective operation at VCC26V. 6. The ground fault protective circuit starts the protective operation at 0.3Ω or less of contact resistance. 7. The load short-circuit protective circuit starts the protective operation at 0.3Ω or less of contact resistance. 8. The atmospheric fault protective circuit protects the chip only from short-circuit between pins. 9. Take into consideration the heat radiation design particularly when VCC is set high or when the load is 2Ω. ICs for Audio Common Use ICs for Audio Common Use ■ Application Circuit VCC =13.2V + 1 IN Ch.1 – + 6 2 1µF 100µF 2000µF – VCC Pin + – 8 0.047µF 4 GND (Input side) 10 AN7171NK 13 AN7176K IN Ch.2 2.2Ω + – + Ripple Filter Pin 200µF 12 16 1µF 100µF 0.1µF 0.1 µF 2.2Ω 200Ω – OUT Ch.1 4Ω 3 GND 7 + – 9 OUT Ch.2 4Ω 15 GND 11 14 0.047µF 0.1 µF 2.2Ω 200Ω 0.1µF 2.2Ω 5 (STAND-BY) +5V (Stand-by mode) AN7171NK : AN7176K : 0V +5V 0V (Stand-by mode) ■ Printed Circuit Board Layout AN7171NK, AN7176K 2.2Ω GND 0.1µF OUT 2–1 2000µF 100µF + – 100µF 0.1µF OUT 2–2 1µF + – IN 2 0.047µF 200Ω 0.047µF 1µF OUT 1–1 – 200µF + – + 2.2Ω 200Ω 0.1µF 2.2Ω 0.1µF 2.2Ω IN 1 MUTE OUT 1–2