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| TDA7268 2 x 2W STEREO AUDIO AMPLIFIER WIDE OPERATING RANGE FROM 4.5V TO 18V POUT = 2W @ THD 10% 12V/8 INTERNAL FIXED GAIN 32dB NO FEEDBACK CAPACITOR NO BOUCHEROT CELL THERMAL PROTECTION AC SHORT CIRCUIT PROTECTION SVR CAPACITOR FOR BETTER RIPPLE REJECTION LOW TURN-ON/OFF POP VERY FEW EXTERNAL COMPONENTS STAND-BY MODE (IST-BY < 300A) DESCRIPTION The device TDA7268 is a new technology stereo Audio Amplifier in DIP package specially deBLOCK DIAGRAM POWERDIP (8+8) ORDERING NUMBER: TDA7268 signed for TV application. Thanks to the fully complementary output configuration the device delivers a rail to rail voltage swing without need of boostrap capacitor. 1 VS1 IN1 4 + - 2 OUT1 8 VS2 IN2 5 + - 7 OUT2 SVR 3 6 S-GND 9/16 P-GND D94AU167B March 1998 1/5 TDA7268 ABSOLUTE MAXIMUM RATINGS Symbol VS IO Top Tj Tstg Operating Supply Voltage Output Peak Current Operating Temperature Range Junction Temperature Storage Temperature Range Parameter Value 18 1.5 0 to 70 150 -40 to 125 Unit V A C C C PIN CONNECTION VS1 OUT1 SVR IN1 IN2 S-GND OUT2 VS2 1 2 3 4 5 6 7 8 D94AU164A 16 15 14 13 12 11 10 9 PGND PGND PGND PGND PGND PGND PGND PGND THERMAL DATA Symbol Rth j-amb Rth j-case Parameter Thermal Resistance Junction to ambient (on PCB) Thermal Resistance Junction to case Max. Max. Value 70 15 Unit C/W C/W Rth with "on Board" Square Heat Sink vs. Copper Area THERMAL RESISTANCE JUNCTION TO AMBIENT(C/W) D98AU830 Example of heatsink using PC board copper 54 52 50 48 46 44 42 40 38 36 34 0 2 4 6 8 10 12 ON BOARD HEAT-SINK AREA (sq.cm) 2/5 TDA7268 ELECTRICAL CHARACTERISTICS (Tamb = 25C; VS = 12V; RL = 8; f = 1KHz; unless otherwise specified.) Symbol VS IS Isb VO AV AV RIN PO THD SVR Parameter Supply Voltage Range Quiescent Current Stand-By Current Quiescent Output Voltage Voltage Gain Voltage Gain Matching Input Impedance Output Power Distortion Supply Voltage Rejection THD = 10% PO = 1W Vrip. = 150mVrms; Frip. = 1KHz RS = 10k RS = 50 Rg = 10K; BW = 20Hz to 20KHz PO = 1W; ISB < 300A 60 THD = 10%; VS = 9V; RL = 4 80 1.8 50 50 1.9 100 2 0.1 50 46 4 60 1 8 0.4 Pin 3 shorted to GND 5.5 31 Test Condition Min. 4.5 40 0.15 6 32 Typ. Max. 18 60 0.3 6.5 33 1.0 Unit V mA mA V dB dB K W % dB dB V dB V dB W 40 en CT Vsb Asb PO Total Input Noise Voltage Cross Talk Stand-By Enable Voltage Stand-By Attenution Output Power 3/5 TDA7268 Fig. 1: Standard Test and Application Circuit 1 VS1 C4 100F VS=12V IN1 R1 10K C1 0.1F IN1 4 + - 2 OUT1 C5 470F 8 8 VS2 IN2 R2 10K C2 0.1F IN2 5 + - 7 OUT2 C6 470F SVR S1 STAND-BY 3 8 6 9/16 P-GND D94AU168D C3 47F S-GND 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 8 speaker application, its maximum power dissipation is about 2W. Assumming that max ambient temperature is 70C. Required thermal resistance of the device and heat dissipating means must be equal to (150 4/5 - 70)/2 = 40C/W. Junction to pin thermal resistance of the package is about 15C/W. That means external heat sink of about 25C/W is required. Stand-By switches must be able to discharge Csvr current. TDA7268 DIP16 PACKAGE MECHANICAL DATA DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 mm TYP. MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 inch TYP. MAX. 5/5 TDA7268 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON 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 SGS-THOMSON Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1998 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON 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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