UNISONIC TECHNOLOGIES CO., LTD A7240 LINEAR INTEGRATED CIRCUIT 20W BRIDGE AMPLIFIER FOR CAR RADIO DESCRIPTION The UTC A7240 is a 20W bridge audio amplifier IC and designed for car radio applications. A comprehensive array of on-chip protection, include protection against AC and DC output short circuits (to ground and across the load), load dump transients, and junction over temperature, is feature to provide reliable operation. Furthermore, the UTC A7240 protects the loudspeaker when one output is short-circuited to ground. FEATURES * Few External Components * Output Protected Against short Circuits to Ground and Across Load * Dump Transient * Thermal Shutdown * Loudspeaker Protection * High Current Capability * Low Distortion/Low Noise ORDERING INFORMATION Order Number Lead Free Halogen Free A7240L-TB7-T A7240G-TB7-T www.unisonic.com.tw Copyright © 2013 Unisonic Technologies Co., Ltd Package Packing TO-220Z7 Tube 1 of 6 QW-R107-048.C A7240 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION 7 6 5 4 3 2 1 Output Supply Voltage Output GND Input Sub and Stand-by Feedback TAB Connected to Pin 4 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R107-048.C A7240 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Operating Supply Voltage VSS 18 V DC Supply Voltage VSS 28 V Peak Supply Voltage (for 50ms) VSS(PEAK) 40 V Peak Output Current (non repetitive t = 0.1ms) IO(PEAK)(*) 4.5 A Peak Output Current (repetitive f .10Hz) I O(PEAK)(*) 3.5 A Power Dissipation at TC = 85°C PD 16 W Storage and Junction Temperature TSTG, TJ -40~+150 C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. (*) Internally limited THERMAL DATA PARAMETER SYMBOL θJC Junction to case RATINGS 4 UNIT °C/W ELECTRICAL CHARACTERISTICS(Ta = 25°C, RTH (heatsink)= 4°C/W, VSS = 14.4V) PARAMETER Supply Voltage Output Offset Voltage Total Quiescent Current SYMBOL VSS VO(OFF) IQ RL =4Ω TEST CONDITIONS Output Power POUT f = 1kHz, d= 10% Distortion THD f = 1kHz, POUT = 50MW ~ 12W Voltage Gain Supply Voltage Rejection GV SVR f = 1KHz f = 100Hz, Rg = 10KΩ Rg = 10KΩ Efficiency Input Resistance Input Sensitivity η RIN VIN fL fH RL =4Ω, f = 1KHz f = 1kHz f = 1kHz, POUT = 2W, RL =4Ω Stand-by Threshold Stand-by Current Stand-by Attenuation POUT = 15W, RL =4Ω VTHD (PIN2) ISTN-BY ASTN-BY VOUT = 2Vrms UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 18 10 B= Curve A B = 22Hz~22KHz eN Low High RL =4Ω RL =8Ω RL =4Ω RL =8Ω 39.5 35 Total Input Noise Frequency Roll Off (-3dB) MIN 70 25 70 TYP MAX UNIT 18 V 150 mV 65 120 mA 20 W 12 0.1 0.5 % 0.05 0.5 40 40.5 dB 40 dB 2 µV 3 10 65 % kΩ 28 mV 30 Hz kHz 1 V 200 µA 90 dB 3 of 6 QW-R107-048.C A7240 LINEAR INTEGRATED CIRCUIT TEST AND APPLICATION CIRCUIT +VSS C7 0.22μF C5 0.1μF C4 220μF INPUT 6 3 C1 1μF 7 OUT UTC A7240 2 1 C2 22μF STANDBY R2 2.2Ω 4 5 C3 22μF R1 2.2Ω C6 0.22μF COMPONENT USAGE SUGGESTION Component Suggest Purpose Larger than Danger of High Frequency Oscillation R1, R2 2.2W Frequency Stability C1 1μF Input DC Decoupling Higher Turn On and Stand-by Delay C2 22μF Ripple Rejection C3 22μF C4 C5 C6, C7 220μF 0.1μF 0.22μF Increase of SVR Increase of the Turn On Delay Feedback low Frequency Cutoff Supply Filter Supply Bypass Frequency Stability UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw Smaller than Higher Turn On Pop. Higher Low Frequency Cutoff Degradation of SVR Higher Low Frequency Cutoff Danger of Oscillation Danger of Oscillation Danger of Oscillation 4 of 6 QW-R107-048.C A7240 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS OutputPower vs. Supply Voltage Distortion vs. Output Power VSS = 10% RL = 4Ω f = 1KHz 22 VSS = 14.4V RL = 4Ω f = 1KHz 8 18 6 14 4 10 2 6 0 9 10 11 12 13 14 15 2 5 10 14 PD (W) PD (W) THD (%) VS (V) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R107-048.C A7240 LINEAR INTEGRATED CIRCUIT UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 6 QW-R107-048.C