TDA x 2W STEREO AUDIO AMPLIFIER
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1 2 x 2W STEREO AUDIO AMPLIFIER WIDE OPERATING RANGE FROM 4.5V TO 18V POUT = THD 10% 12V/8Ω INTERNAL FIXED GAIN 32dB NO FEEDBACK CAPACITOR NO BOUCHEROT CELL THERMAL PROTECTION AC SHORT CIRCUIT PROTECTION SVR CAPACITOR FOR BETTER RIPPLE REJECTION LOW TURNON/OFF POP VERY FEW EXTERNAL COMPONENTS STANDBY MODE (ISTBY < 300µA) POWERDIP (88) ORDERING NUMBER: TDA7268 DESCRIPTION The device TDA7268 is a new technology stereo Audio Amplifier in DIP package specially designed for TV application. Thanks to the fully complementary output configuration the device delivers a rail to rail voltage swing without need of boostrap capacitor. BLOCK DIAGRAM 1 V S1 4 2 OUT1 8 V S2 5 7 OUT2 SVR SGND PGND D94AU167B March /5
2 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V S Operating Supply Voltage 18 V I O Output Peak Current 1.5 A T op Operating Temperature Range 0 to 70 C T j Junction Temperature 150 C T stg Storage Temperature Range 40 to 125 C PIN CONNECTION V S1 OUT1 SVR SGND OUT V S2 8 9 D94AU164A THERMAL DATA Symbol Parameter Value Unit R th jamb Thermal Resistance Junction to ambient (on PCB) Max. 70 C/W R th jcase Thermal Resistance Junction to case Max. 15 C/W Rth with "on Board" Square Heat Sink vs. Copper Area Example of heatsink using PC board copper THERMAL RESISTANCE JUNCTION TO AMBIENT( C/W) 2/ ON BOARD HEATSINK AREA (sq.cm) D98AU830
3 ELECTRICAL CHARACTERISTICS (Tamb = 25 C; VS = 12V; RL = 8Ω; f = 1KHz; unless otherwise specified.) Symbol Parameter Test Condition Min. Typ. Max. Unit V S Supply Voltage Range V I S Quiescent Current ma I sb StandBy Current Pin 3 shorted to GND ma V O Quiescent Output Voltage V A V Voltage Gain db A V Voltage Gain Matching 1.0 db R IN Input Impedance KΩ P O Output Power THD = 10% W THD Distortion P O = 1W % SVR Supply Voltage Rejection V rip. = 150mVrms; F rip. = 1KHz R S = 10kΩ R S = 50Ω 40 e n Total Input Noise Voltage Rg = 10KΩ; BW = 20Hz to 20KHz db db 4 8 µv CT Cross Talk P O = 1W; db V sb StandBy Enable Voltage I SB < 300µA 1 V A sb StandBy Attenution db P O Output Power THD = 10%; V S = 9V; R L = 4Ω 1.8 W 3/5
4 Fig. 1: Standard Test and Application Circuit 1 V S1 V S =12V C1 0.1µF 4 2 OUT1 C4 100µF R1 10K C5 470µF 8Ω 8 V S2 C2 0.1µF 5 7 OUT2 C6 470µF R2 10K SVR 3 8Ω S1 STANDBY C3 47µF SGND PGND D94AU168D Note: Add R1 & R2 on demoboard only for DC tests. Fig. 2: PCB And Components Layout Of The Application Circuit of Figure 1 APPLICATION HINTS: For 12V supply and 8Ω speaker application, its maximum power dissipation is about 2W. Assumming that max ambient temperature is 70 C. Required thermal resistance of the device and heat dissipating means must be equal to (150 70)/2 = 40 C/W. Junction to pin thermal resistance of the package is about 15 C/W. That means external heat sink of about 25 C/W is required. StandBy switches must be able to discharge Csvr current. 4/5
5 DIP16 PACKAGE MECHANICAL DATA DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. a B b b D E e e F I L Z /5
6 Information furnished is believed to be accurate and reliable. However, SGSTHOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGSTHOMSON Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGSTHOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGSTHOMSON Microelectronics SGSTHOMSON Microelectronics Printed in Italy All Rights Reserved SGSTHOMSON Microelectronics GROUP OF COMPANIES Australia Brazil Canada China France Germany Italy Japan Korea Malaysia Malta Morocco The Netherlands Singapore Spain Sweden Switzerland Taiwan Thailand United Kingdom U.S.A. 6/5
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