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| ICs for Audio Common Use AN7124 Dual 3.1 W Audio Power Amplifier s Overview The AN7124 is a monolithic integrated circuit designed for dual audio power amplifier of portable radio cassette. (10.0) 7.70.3 Unit : mm 12 3.6 +0.10 0.25 -0.05 2.54 (12.5) (1.2) 19.10.3 21.90.3 HSIP012-P-0000A s Block Diagram 45 dB 45 dB Mute STB Ripple filter Over current thermal protection circuit 10 11 GND GND s Pin Descriptions Pin No. 1 2 3 4 5 6 Stand-by Muting ch.2 input ch.1 input Input GND Ripple filter Description Pin No. 7 8 9 10 11 12 ch.1 output ch.1 bootstrap Output GND VCC ch.2 bootstrap ch.2 output 1 Description VCC 12 1 2 3 4 5 6 7 8 9 1.800.15 * Radio-cassette 1.20.1 3.50.3 s Applications 1.450.15 * Audio output : 3.1 W x 2 channel * Built-in standby and muting circuit * Built-in thermal shut down protection circuit * Low pop noise during standby and mute ON/OFF * No negative feedback pin 29.750.30 28.00.3 20.00.3 (1.27) s Features (1.3) R1.8 0.6 1 0.6 -0.05 (1.27) (10.0) +0.15 29.60.3 AN7124 s Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature Symbol VCC ICC PD Topr Tstg ICs for Audio Common Use Rating 24 4.0 37.5 -25 to +75 -55 to +150 Unit V A W C C s Recommended Operating Range Parameter Supply voltage Symbol VCC Range 6.0 to 18.0 Unit V s Electrical Characteristics at VCC = 12 V, RL = 3 , f = 1 kHz, Ta = 25 C Parameter Quiescent current Output noise voltage Voltage gain Total harmonic distortion Maximum output 1 Channel balance Ripple rejection Standby current Muting effects *1 *3 *1 *2 *1 Symbol ICQ VNO GV THD PO1 CB RR ISTB Mut PO2 CT VIN = 0 mV Conditions VIN = 0 mV,PG = 10 k VIN = 3 mV VIN = 3 mV THD = 10 % VIN = 3 mV RG = 0 ,VR = 280 mVrms,fR = 120 Hz VIN = 0 mV VIN = 10 mV THD = 10 %,VCC = 9 V RG = 10 k,VIN = 10 mV,f = 1 kHz Min 12 43 4.3 -1 45 60 2.5 50 Typ 19 0.27 45 0.05 5.0 0 50 1 80 3.0 64 Max 26 0.5 47 0.5 1 10 Unit mA mVrms dB % W dB dB A dB W dB Maximum output 2 Crosstalk *1,*3 Note) *1 : With a filter band from 20 Hz to 20 kHz (12 dB/OCT) used. *2 : With a filter band from 400 Hz to 30 kHz used. *3 : Reference data for design. 2 ICs for Audio Common Use s Application Circuit Example AN7124 10 11 1 F 22 F 3.9 k (Off)5 V 33 F 8.2 k 5 V(On) 1 F 100 F 47 nF 2.2 RL 3 47 F 1 000 F 1 000 F 2.2 VCC = 9 V/12 V 47 F 47 nF RL 3 1 000 F VIN2 VIN1 STB (On)0 V Mute 0 V(Off) s Characteristics Curve PD Ta 70 62.5 W 60 Power dissipation PD (W) 50 (1) 40 30 20.8 W 20 15.6 W 10 3.0 W 0 0 40 80 120 160 (4) (2) (3) Ambient temperature Ta (C) 1. TC = Ta (j-c = 2 C/W) 2. 20.83 W (f = 4.0 C/W) With a 100 cm2 x 3 mm Al heat sink (black colour coated) or a 200 cm 2 x 2 mm Al heat sink (not lacquered) 3. 15.63 W (f = 6.0 C/W) With a 100 cm2 x 2 mm Al heat sink(not lacquered) 4. 3.0 W at Ta = 25 C (j-a = 42 C/W) Without heat sink 12 1 2 3 4 5 6 7 8 9 3 AN7124 s Application Note 1.Voltage gain The close loop gain of AN7124 is fixed at 45 dB(typ.) ICs for Audio Common Use R1 R2 84 15 k GV = 20 log( R1 R2 ) 2.Standby function Standby is ON when Pin1 is set to "L". By applying a 5 V to the standby pin, transistor Q1 will be turned ON to provide a constant current (I) for driving other parts of the circuit. The RC is to create a TIME CONSTANT for the standby pulse during charging and discharging. ZSTBY 1 C On Q1 I VCC Off 5V R Stb Threshold voltage (at Pin1) : ON<2.8 V Bias R Mute C On ZMUTE 2 Off 5V Threshold voltage (at Pin2) : 10 % mute = 1.5 V 90 % mute = 2.8 V Impedance, ZMUTE 45 k 4 ICs for Audio Common Use s Application Note (continued) 4.Oscillation AN7124 To prevent oscillation, it is advisable to use C (Zobel network capacitor). Using polyester film capacitor has small characteristic fluctuation with temperature and the frequency.The resistor R connected in series with C is effective for phase correction at high frequency, as a result, it improves the oscillation allowance. Pin7,12 C R 1 000 F 47 nF 2.2 5.Bootstrap The capacitor C connected between the output and bootstrap pin helps to increase the output dynamic range and hence increases the output power of the IC. pp VCC Pin8,11 47 F C Pin7,12 5 |
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