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| TDA7262 20+20W STEREO AMPLIFIER WITH STAND-BY WIDE SUPPLY VOLTAGE RANGE HIGH OUTPUT POWER 28+28W TYP. MUSIC POWER 20+20W @ THD = 10%, RL = 4, VS = 28V HIGH CURRENT CAPABILITY (UP TO 3.5A) STAND-BY FUNCTION AC SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION DESCRIPTION The TDA7262 is class AB dual Hi-Fi Audio power amplifier assembled in Multiwatt package, specilally designed for high quality stereo application as Hi-Fi music centers and TV sets. Figure 1: Stereo Application Circuit with Stand-By MULTIWATT11 ORDERING NUMBER: TDA7262 March 1995 1/8 TDA7262 ABSOLUTE MAXIMUM RATINGS Symbol VS IO IO Ptot Tstg, Tj Supply Voltage Output Peak Current (repetitive f > 20Hz) Output Peak Current (non repetitive, t > 100s) Power Dissipation (Tcase = 70C) Storage and Junction Temperature Parameter Value 35 3.5 4.5 30 -40 to 150 Unit V A A W C PIN CONNECTION TEST CIRCUIT 2/8 TDA7262 THERMAL DATA Symbol Rth j-case Description Thermal Resistance Junction-case Max Value 2.5 Unit C/W ELECTRICAL CHARACTERISTICS (Refer to the stereo test circuit, VS = 28V; f = 1KHz; Tamb = 25C, unless otherwise specified) Symbol VS VO Id PO Parameter Supply Voltage Quiescent Output Voltage Total Quiescent Current Output Power (each channel) VS = 32V VS = 28V VS = 32V Music Power STD rules (T = 1s) VS = 32V; d = 10%; RL = 4 d = 10% R L = 4 R L = 8 d = 1% R L = 4 R L = 8 d Total Harmonic Distortion f = 100Hz to 10KHz PO = 0.1 to 14W; RL = 4 PO = 0.1 to 8W; RL = 8 R L = 4 RS = 100 f = 1KHz f = 10KHz (Vrms) f = 1KHz; non inverting Input R L = 4 R L = 4 f = 1KHz A Curve; RS = 10K f = 22Hz to 22KHz; RS = 10K SVR Tj Supply Voltage Rejection (each channel) Thermal Shutdown Junction Temperature R S = 0 to 10K; fr = 100Hz Vr = 0.5V 35.5 300 70 200 40 80 36 0.5 1.5 2.5 55 145 8 36.5 Test Condition Min. 8 15.5 65 70 28 22 13 18 10 0.2 0.1 60 50 120 Typ. Max. 32 Unit V V mA mA W W W W W % % dB dB mV K Hz KHz dB dB V V dB C 10 CT Cross Talk Vi Ri fL fH GV GV eN Input Saturation Voltage Input Resistance Low Frequency roll-off (-3dB) High Frequency roll-off (-3dB) Closed Loop Voltage Gain Closed Loop Gain match Total Input Noise Voltage STAND-BY FUNCTION V3 AM IM Stand-By Threshold Stand-By Attenuation Stand-By Quiescent Current VS = 32V VS = 32V; V3 < 0.45V VS = 32V; V3 < 0.45V 0.45 60 0.9 100 3 5 V dB mA 3/8 TDA7262 APPLICATION SUGGESTION The recommended values of the components are those shown on application circuit of Figure 1. Different values can be used; the following table can help the designer. Component R1 and R3 R2 and R4 R5 and R6 C1 and C2 Recomm. Value 1.3K 18 1 2.2F Purpose Close loop gain setting (*) Frequency stability Input DC decoupling Larger than Increase of gain Decrease of gain Danger of oscillations higher turn-on delay - worse turn-ON pop - higer low freq. cutoff. Increase of noise - Degradation of SVR - worse turn-OFF pop by stand-by Danger of oscillations worse turn-OFF pop Smaller than Decrease of gain Increase of gain C3 22F (**) - Ripple rejection - Stand-by time constant Supply setting Supply setting Feedback input DC decoupling Frequency stability Output DC decoupling Increase of the Switch-on time C4 C5 C6 and C7 C8 and C9 C10 and C11 100nF 1000F 220F 0.1F 1000F to 2200F Danger of oscillations Higher low-frequency cut-off (*) Closed loop gain must be higher than 26dB. (**) 220F in case of stand-by utilization. Figure 2: Ouput Power vs. Supply Voltage Figure 3: Ouput Power vs. Supply Voltage 4/8 TDA7262 Figure 4: Distortion vs. Ouput Power Figure 5: Distortion vs. Ouput Power Figure 6: Quiescent Current vs. Supply Voltage Figure 7: Supply Voltage Rejection vs. Frequency Figure 8: Output Attenuation vs. Vpin 3 Figure 9: Total Power Dissipation & Efficiency vs. Output Power 5/8 TDA7262 Figure 11: Total Power Dissipation & Efficiency vs. Output Power Figure 12 BUILD-IN PROTECTION SYSTEMS Thermal shut-down The presence of a thermal limiting circuit offers the following advantages: 1) an overload on the output (even if it is permanent), or an excessive ambient temperature can be easily withstood. 2) the heatsink can have a smaller factor of safety compared with that of a conventional circuit. There is no device damage in the case of excessive junction temperature; all that happens is that PO ( and therefore Ptot) and IO are reduced. The maximum allowable power dissipation depends upon the size of the external heatsink (i.e. its thermal resistance); Figure 12 shows this dissipable power as a function of ambient temperature for different thermal resistance. Short circuit (AC Conditions) The TDA7262 can withstand accidental short circuits across the speaker made by a wrong connection during normal play operation. MOUNTING INSTRCTIONS The power dissipated in the circuit must be removed by adding an external heatsink. Thanks to the MULTIWATT package attaching the heatsink is very simple, a screw or a compression spring (clip) being sufficient. between the heatsink and the package it is better to insert a layer of silicon grease, to optimize the thermal contact; no electrical isolation is needed between the two surfaces. 6/8 TDA7262 MULTIWATT11 PACKAGE MECHANICAL DATA DIM. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.4 17.25 10.3 2.65 4.25 4.73 1.9 1.9 3.65 4.55 5.08 17.5 10.7 22.2 22.1 0.49 0.88 1.45 16.75 19.6 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.43 2.6 2.6 3.85 0.862 0.854 0.685 0.679 0.406 0.104 0.167 0.186 0.075 0.075 0.144 0.179 0.200 0.689 0.421 0.874 0.87 1.7 17 1 0.55 0.95 1.95 17.25 0.019 0.035 0.057 0.659 0.772 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.214 0.102 0.102 0.152 0.067 0.669 mm MIN. TYP. MAX. 5 2.65 1.6 0.039 0.022 0.037 0.077 0.679 MIN. inch TYP. MAX. 0.197 0.104 0.063 7/8 TDA7262 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. Specifications 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) 1995 SGS-THOMSON Microelectronics - All Rights Reserved MULTIWATT (R) is a Registered Trademark of SGS-THOMSON Microelectronics SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands - Singapore Spain - Sweden - Switzerland - Taiwan - Thaliand - United Kingdom - U.S.A. 8/8 |
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