ICs for Audio Common Use AN7551Z Power IC for BTL car audio ■ Overview 25 +0.2 1.27 0.6 – 0.1 (5.08) (4.29) (3.30) (5.70) 2.4±0.5 18.75±0.30 (24.45) 14.5±0.3 15.5±0.3 1 +0.15 0.40 – 0.05 (2.15) (1.26) 1.5±0.1 33.0±0.3 33.36±0.30 Seating plane (1.95) R1.8±0.1 4.5±0.2 φ3.6±0.1 3.75±0.10 Unit : mm 31.0±0.3 27.0±0.3 21.0±0.1 (10.50) (10.50) 3.6±0.1 The AN7551Z is an audio power IC developed as a car audio output (35 W × 4-ch). CR to stop oscillation is built in between the output pin and GND so that a space saving of set is possible. Also, it is incorporating a perfect muting circuit which does not make a shock noise so that a shock noise design in the set transitional state can be made easily when used together with its standby function. In addition, it is incorporating various protective circuits to protect the IC from destruction by GND-open earth short-circuiting and power supply surge which are the important subject of power IC, and the IC will largely contribute to a high reliability design of equipment. ■ Features • Pin arrangement which does not allow the input/output patterns to intersect each other so that it is possible to make a pattern design on a one-sided printed circuit board. • Incorporating various protection circuits (thermal protection, short-circuit to VCC , short-circuit to VCC in VCCopened, short-circuit to GND, short-circuit to GND in GND-opened, over voltage, power supply surge, and ASO protection, etc.) • Incorporating standby function (shock noise-free at STBon/off) • Incorporating standby function (shock noise-free at Mute-on/off) • External components reduction • Provided with beep sound input pin • Equipped with auxiliary sound input pin • Inverted pin layout of AN7550NZ on right and left pins HZIP025-P-0980 ■ Applications • Car stereo, miniature audio component, karaoke and other audio equipment. 1 AN7551Z ICs for Audio Common Use 1 VCC 7 14 5 22 VCC ■ Block Diagram 10 Ripple Filter 25 GND (Output) 17 Protection Circuit 24 18 23 GND (Output) 15 Beep Input 21 GND (Output) 13 Attenuation Control 20 12 11 19 Muting 4 GND (Sub) 9 Attenuator AUX 2 8 Beep 3 6 GND (Input) 16 AUX Input Attenuator ■ Pin Descriptions Pin No. Description Pin No. Description 1 Ripple filter 14 Supply voltage VCC 2 Mute 15 ch.2 − output 3 ch.3 input 16 AUX input 4 GND (Sub) 17 ch.2 + output 5 ch.4 input 18 GND (ch.2 output) 6 GND (Input) 19 ch.3 − output 7 ch.2 input 20 GND (ch.3 output) 8 Beep input 21 ch.3 + output 9 ch.1 input 22 Supply voltage VCC 10 Standby 23. ch.4 − output 11 ch.1 − output 24 GND (ch.4 output) 12 GND (ch.1 output) 25 ch.4 + output 13 ch.1 + output Note) The output pin requires no capacitor and resistor for oscillation prevention. If those are required for countermeasure against noise, be sure to use after confirmation. 2 GND (Output) ICs for Audio Common Use AN7551Z ■ Absolute Maximum Ratings Parameter Supply voltage Symbol Rating Unit VCC 25 V VSurge 65 V ICC 12 A PD 59 W Topr −30 to +85 °C Tstg −55 to +150 °C *2 Peak power-supply-voltage *3 Supply current Power dissipation *4 Operating ambient temperature Storage temperature *1 *1 Note) *1 : Ta = 25 °C except power dissipation, operating ambient temperature and storage temperature. *2 : Without signal *3 : Time = 0.2 s *4 : Ta = 85 °C ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 8.0 to 18.0 V ■ Electrical Characteristics at VCC = 13.2 V, freq = 1 kHz, Ta = 25 °C Parameter Symbol Conditions Min Typ Max Unit Quiescent circuit current ICQ RG = 10 kΩ, RL = 4 Ω 300 450 mA Standby current ISTB RG = 10 kΩ, RL = 4 Ω 1 10 µA VNO RG = 10 kΩ, RL = 4 Ω 0.15 0.5 mVrms GV VIN = 40 mV, RL = 4 Ω 32 34 36 dB THD1 VIN = 40 mV, RL = 4 Ω 0.05 0.2 % PO THD = 10 %, RL = 4 Ω 16.0 19.5 W RR RL = 4 Ω, RG = 10 kΩ, VR = 1 Vrms , fr = 1 kHz 60 68 dB Channel balance CB VIN = 40 mV, RL = 4 Ω 0 1 dB Crosstalk CT VIN = 40 mV, RL = 4 Ω RG = 10 kΩ 60 70 dB VOFF RG = 10 kΩ, RL = 4 Ω −250 0 250 mV MT VIN = 40 mV, RL = 4 Ω 70 86 dB ZI VIN = ±0.3 VDC 24 30 36 kΩ VS RL = 4 Ω, RG = 10 kΩ, VMUTE = 5 V, VSTB = On/Off 50 Hz HPF −100 0 100 mV[p-0] Output noise voltage *1 Voltage gain Total harmonic distortion 1 Maximum output power Ripple rejection ratio *1 Output offset voltage Muting effect *1 Input impedance Shock noise *2 Note) *1 : Use 15 Hz to 30 kHz (12 dB/OCT) band-pass filter at measurement. *2 : Change over the standby pin at 0V and 5V with the following time. Standby pin voltage 5V 0V 500 ms 500 ms 3 AN7551Z ICs for Audio Common Use ■ Electrical Characteristics at VCC = 9 V, Ta = 25 °C (continued) Parameter Symbol Conditions Min Typ Max Unit Total harmonic distortion 2 THD2 VIN = 20 mV, fIN = 20 kHz, RG = 10 Ω, RL = ∞ 0.1 0.5 % Mute-on threshold voltage MTON VIN = 40 mV, RL = 4 Ω 4 V Mute-off threshold voltage MTOFF VIN = 40 mV, RL = 4 Ω 0.8 V VIN = 40 mV, RL = 4 Ω GV = −1 dB (0 dB : 1 kHz) 20 40 kHz Cutoff frequency fC • Design reference data at VCC = 13.2 V, f = 1 kHz, measuring bandwidth 15 Hz to 30 kHz (12 dB/OCT) filter is used Note) The characteristic values below are theoretical values for designing and not guaranteed. Parameter 4 Symbol Conditions Min Typ Max Unit max. power, RL = 4 Ω 28 W Maximum output power POmax Maximum output power PO2 VCC = 14.4 V, THD = 10 %, RL = 4 Ω 21 W Maximum output power POmax2 VCC = 14.4 V, max. power, RL = 4 Ω 34 W Power band fPL VCC = 14.4 V, THD = 1 %, RL = 4 Ω, POL = −3 dB (1 kHz : 0 dB) 10 Hz Power band fPH VCC = 14.4 V, THD = 1 %, RL = 4 Ω, POH = −3 dB (1 kHz : 0 dB) 18 kHz STB threshold voltage VSTB1 RG = 10 kΩ, RL = 4 Ω, STB→ACT 2.2 V STB threshold voltage VSTB2 RG = 10 kΩ, RL = 4 Ω, ACT→STB 1.5 V ICs for Audio Common Use AN7551Z ■ Terminal Equivalent Circuits Pin No. Equivalent circuit Description 1 VCC DC Voltage Ripple filter pin: Output current from 3 mA to 10mA 13 V Mute pin : Mute switchover pin Threshold voltage about 2.1 V 0V 15 kΩ 350 µA 1 1.7 mA 20 kΩ 2 2 200 Ω 10 kΩ 100 kΩ 3 ch.3 input pin : ch.3 input signal application pin Input impedance 30 kΩ 3 200 Ω abt. 15 µA 0 mV to 10 mV abt. 15 µA 600 Ω 30 kΩ 4 5 GND (circuit board) : Circuit board 5 abt. 15 µA 200 Ω abt. 15 µA ch.4 input pin : ch.4 input signal application pin Input impedance 30 kΩ 0V 0 mV to 10 mV 600 Ω 30 kΩ 5 AN7551Z ICs for Audio Common Use ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit Description Voltage 6 GND (input) : Grounding pin for input 0V 7 7 abt. 15 µA 200 Ω abt. 15 µA ch.2 input pin : ch.2 input signal application pin Input impedance 30 kΩ 0 mV to 10 mV 600 Ω 30 kΩ 8 VREF = 6.3 V Beep input 600 Ω 15 kΩ 13 Beep sound input pin : Beep sound signal input pin Input impedance 15 kΩ 0V 600 Ω 8 13 kΩ 2 kΩ 2 kΩ 2 kΩ 17 VREF = 6.3 V 600 Ω 600 Ω 15 kΩ 9 9 abt. 15 µA 200 Ω abt. 15 µA ch.1 input pin : ch.1 input signal application pin Input impedance 30 kΩ 0 mV to 10 mV 600 Ω 30 kΩ 10 Standby control pin : Standby switch over pin Threshold voltage about 2.1 V 10 10 kΩ 2 kΩ 6 5V ICs for Audio Common Use AN7551Z ■ Terminal Equivalent Circuits (continued) Pin No. 11 Equivalent circuit Description 14 Drive circuit Voltage ch.1 output pin (−) : ch.1 negative phase output pin 6.3 V GND (output) : Grounding pin for ch.1 output 0V ch.1 output pin (+) : ch.1 positive phase output pin 6.3 V Power supply voltage pin : Power supply connection pin 13.2 V ch.2 output pin (−) : ch.2 negative phase output pin 6.3 V AUX input pin : Input impedance 10.6 kΩ 6.3 V Pre-amp. 11 Drive circuit 12 600 Ω 15 kΩ 12 13 14 Drive circuit Pre-amp. 13 Drive circuit 12 VREF = 6.3 V 600 Ω 15 kΩ 14 15 14 Drive circuit Pre-amp. 15 Drive circuit 18 15 kΩ 600 Ω 16 VREF = 6.3 V 600 Ω 15 kΩ 17 600 Ω 16 10 kΩ 7 AN7551Z ICs for Audio Common Use ■ Terminal Equivalent Circuits (continued) Pin No. 17 Equivalent circuit Description 14 Drive circuit Voltage ch.2 output pin (+) : ch.2 positive phase output pin 6.3 V GND (output) : Grounding pin for ch.2 output 0V ch.3 output pin (−) : ch.3 negative phase output pin 6.3 V GND (output) : Grounding pin for ch.3 output 0V ch.3 output pin (+) : ch.3 positive phase output pin 6.3 V Power supply voltage pin : Power supply connection pin 13.2 V Pre-amp. 17 Drive circuit 18 VREF = 6.3 V 15 kΩ 600 Ω 18 19 22 Drive circuit Pre-amp. 19 Drive circuit 20 VREF = 6.3 V 15 kΩ 20 21 600 Ω 22 Drive circuit Pre-amp. 21 Drive circuit 24 VREF = 6.3 V 15 kΩ 22 8 600 Ω ICs for Audio Common Use AN7551Z ■ Terminal Equivalent Circuits (continued) Pin No. 23 Equivalent circuit Description 22 Drive circuit Voltage ch.4 output pin (−) : ch.4 negative phase output pin 6.3 V GND (output) : Grounding pin for ch.4 output 0V ch.4 output pin (+) : ch.4 positive phase output pin 6.3 V Pre-amp. 23 Drive circuit 24 15 kΩ 600 Ω 24 25 22 Drive circuit Pre-amp. 25 Drive circuit 24 VREF = 6.3 V 15 kΩ 600 Ω 9 AN7551Z ICs for Audio Common Use ■ Application Circuit Example VCC 7 14 18 23 15 21 13 20 12 19 11 2 1 µF 22 kΩ 10 kΩ AUX 10 kΩ 5V Muting Beep 1 µF 4Ω 4Ω 4 24 9 17 16 25 6 4Ω 10 8 4Ω 1 µF 1 3 33 µF 10 kΩ 22 10 kΩ 5 1 µF 2200 µF 1 µF 0V 5V ■ Usage notes 1. Be sure to use the circuit with an external heat-sink and fix the external heat-sink on chassis when using it. 2. Connect the heat radiating fin to GND potential. 3. This IC has built-in protection circuit against short-circuit to VCC , short-circuit to GND and ASO. However avoid short-circuit to VCC , short-circuit to GND and short-circuit of load. 4. The thermal protection circuit operates at Tj = about 150 °C but it automatically returns to the normal operation when the temperature decreases. 5. The over voltage protection circuit operates at VCC = about 20 V. 6. Be especially careful to heat radiation design when used at an increased VCC. 7. Connect the beep sound input pin to GND when the beep sound function is not used. 8. Do not lower the beep sound input pin below − 0.3 V. 9. Keep AUX input pin in open state when AUX function is not used. 10. Connect only GND pin (signal source) to the signal GND of the amplifier in previous stage. • There is a possibility of device destruction under the following conditions; 1. If the power supply pin and GND pin are connected in reverse to the power supply. 2. If the power supply pin and GND pin are in open state and the power supply is connected across the output pins. 3. If the output pin is grounded when GND pin is open. 4. If more than three output pins are grounded to the earth at a time with more than 1.3 Ω short-circuiting resistor with which the protection circuit does not operate. 5. If plus and minus output pins are short circuited to the supply line at a time with more than 1 Ω short-circuiting resistor with which the protection circuit does not operate. 6. If the RF pin and the output pin are short circuited and short-circuited to the earth. 10 ICs for Audio Common Use AN7551Z ■ Technical Information • HZP025-P-0980 package power dissipation PD T a 120 113.6 With an infinitely heat-sink Power dissipation PD (W) 100 Rth(j − c) = 1.1 °C/ W Rth(j − a) = 31.1 °C/ W 80 1 °C / W heat-sink 59.5 60 2 °C / W heat-sink 40.3 40 5 °C / W heat-sink 20.5 20 Package without heat-sink 4.02 0 0 25 50 75 100 125 150 Ambient temperature Ta (˚C) 11