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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 Request for your special attention and precautions in using the technical information and semiconductors described in this material (1) An export permit needs to be obtained from the competent authorities of the Japanese Government if any of the products or technologies described in this material and controlled under the "Foreign Exchange and Foreign Trade Law" is to be exported or taken out of Japan. (2) The technical information described in this material is limited to showing representative characteristics and applied circuit examples of the products. It does not constitute the warranting of industrial property, the granting of relative rights, or the granting of any license. (3) The products described in this material are intended to be used for standard applications or general electronic equipment (such as office equipment, communications equipment, measuring instruments and household appliances). Consult our sales staff in advance for information on the following applications: * Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the products may directly jeopardize life or harm the human body. * Any applications other than the standard applications intended. (4) The products and product specifications described in this material are subject to change without notice for reasons of modification and/or improvement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product Standards in advance to make sure that the latest specifications satisfy your requirements. (5) When designing your equipment, comply with the guaranteed values, in particular those of maximum rating, the range of operating power supply voltage and heat radiation characteristics. Otherwise, we will not be liable for any defect which may arise later in your equipment. Even when the products are used within the guaranteed values, redundant design is recommended, so that such equipment may not violate relevant laws or regulations because of the function of our products. (6) When using products for which dry packing is required, observe the conditions (including shelf life and after-unpacking standby time) agreed upon when specification sheets are individually exchanged. (7) No part of this material may be reprinted or reproduced by any means without written permission from our company. Please read the following notes before using the datasheets A. These materials are intended as a reference to assist customers with the selection of Panasonic semiconductor products best suited to their applications. Due to modification or other reasons, any information contained in this material, such as available product types, technical data, and so on, is subject to change without notice. Customers are advised to contact our semiconductor sales office and obtain the latest information before starting precise technical research and/or purchasing activities. B. Panasonic is endeavoring to continually improve the quality and reliability of these materials but there is always the possibility that further rectifications will be required in the future. Therefore, Panasonic will not assume any liability for any damages arising from any errors etc. that may appear in this material. C. These materials are solely intended for a customer's individual use. Therefore, without the prior written approval of Panasonic, any other use such as reproducing, selling, or distributing this material to a third party, via the Internet or in any other way, is prohibited. 2001 MAR |
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