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| (R) TDA7240A 20W BRIDGE AMPLIFIER FOR CAR RADIO .COMPACTHEPTAWATTPACKAGE .FEWEXTERNALCOMPONENTS .OUTPUTPROTECTEDAGAI .DUMPTRANSI .THERMALSHUTDOWN .LOUDSPEAKERPROTECTI .HI .LOWDI ON GH CURRENT CAPABILITY STORTION/LOW NOISE DESCRIPTION NST SHORT CIRCUITS TO GROUND AND ACROSS LOAD ENT Heptawatt H Heptawatt V ORDERING NUMBERS: TDA7240AH TDA7240AV The TDA7240A is a 20W bridge audio amplifier IC designed specially for car radio applications. Thanks to the low external part count and compact Heptawatt 7-pin power package the TDA7240A occupies little space on the printed circuit board. Figure 1: Test and Application Circuit Reliable operation is guaranteed by a comprehensive array of on-chip protection features. These include protection against AC and DC output short circuits (to ground and across the load), load dump transients, and junction overtemperature. Additionally, theTDA7240Aprotectstheloudspeakerwhen one output is short-circuited to ground. December 1998 1/8 TDA7240A PIN CONNECTION (Top view) ABSOLUTE MAXIMUM RATINGS Symbol Vs Vs Vs Io (*) Io (*) Ptot Tstg, Tj Operating Supply Voltage DC Supply Voltage Peak Supply Voltage (for 50ms) Peak Output Current (non repetitive t = 0.1ms) Peak Output Current (repetitive f 10Hz) Power Dissipation at Tcase = 85C Storage and Junction Temperature Parameter Value 18 28 40 4.5 3.5 16 -40 to 150 Unit V V V A A W C (*) Internally limited THERMAL DATA Symbol Rth j-case Parameter Thermal Resistance Junction-case Max. Value 4 Unit V 2/8 TDA7240A ELECTRICAL CHARACTERISTICS (refer to the circuit of fig. 1, T amb = 25C, Rth (heatsink) = 4C/W, Vs = 14.4V) Symbol Vs Vos Id Po Parameter Supply Voltage Output Offset Voltage Total Quiescent Current Output Power RL = 4 f = 1kHz; d = 10% R L = 4 R L = 8 d Distortion RL = 4 Po = 50mW to 12W RL = 8 Po = 50mW to 12W GV SVR EN Voltage Gain Supply Voltage Rejection Total Input Noise f = 1KHz f = 100Hz Rg = 10K (*) (**) Isb Ri Vi fL fH As Efficiency Stand-by Current Input Resistance Input Sensitivity Low Frequency Roll Off (-3dB) High Frequency Roll Off (-3dB) Stand-by Attenuation f = 1kHz f = 1kHz; Po = 2W; RL = 4 Po = 15W; Po = 15W; Vo = 2Vrms RL = 4 RL = 4 25 70 90 1 70 28 30 RL = 4 f = 1KHz 2 3 65 200 10 R g = 10K f = 1kHz f = 1kHz 39.5 35 18 10 20 12 0.1 0.05 40 40 0.5 0.5 40.5 W W % % dB dB V V % A k mV Hz kHz dB V 65 Test Conditions Min. Typ. Max. 18 150 120 Unit V mV mA VTH (pin2) Stand-by Threshold (*) B= Curve A (**) B = 22Hz to 22 KHz Figure 2 : P.C. Board and Components layout of the Circuit of Fig. 1.(1:1scale) 3/8 TDA7240A APPLICATION SUGGESTION The recommendedvalues of the componentsare thoseshown on applicationcircuit of Fig. 1. Different values can be used, the following table can help the designer. Component R1, R2 C1 Recommended Value 2.2 1F Purpose Frequency Stability Input DC Decoupling Larger Than Danger of High Frequency Oscillation Higher Turn On and Stand-by Delay Increase of SVR Increase of the Turn On Delay Higher Turn On Pop. Higher Low Frequency Cutoff Degradation of SVR Smaller Than C2 22F Ripple Rejection C3 C6, C7 C4 C5 22F 0.22F 220F 0.1F Feedback low Frequency Cutoff Frequency Stability Supply Filter Supply Bypass Higher Low Frequency Cutoff Danger of Oscillation Danger of Oscillation Danger of Oscillation Figure 3 : Output Power vs. Supply Voltage. Figure 4 : Distortion vs. Output Power. Figure 5 : Output Power vs. Supply voltage. Figure 6 : Distortion vs. Output Power. 4/8 TDA7240A Figure 7 : Distortion vs. Frequency. Figure 8 : Supply Voltage Rejection vs. Frequency. Figure 9 : Power Dissipation and Efficiency vs. Output Power. Figure 10 : Power Dissipation and Efficiency vs. Output Power. 5/8 TDA7240A DIM. A C D D1 E E1 F F1 G G1 G2 H2 H3 L L1 L2 L3 L4 L5 L6 L7 L9 M M1 V4 Dia MIN. mm TYP. MAX. 4.8 1.37 2.8 1.35 0.55 0.97 0.8 0.9 2.74 5.28 7.82 10.4 10.4 17.1 21.84 22.77 1.29 3 15.8 6.6 3.05 5.33 40 3.85 MIN. inch TYP. MAX. 0.189 0.054 0.110 0.053 0.022 0.038 0.031 0.035 0.105 0.205 0.307 0.409 0.409 0.673 0.860 0.896 0.051 0.118 0.622 0.260 0.120 0.210 0.152 OUTLINE AND MECHANICAL DATA 2.4 1.2 0.35 0.7 0.6 2.34 4.88 7.42 10.05 16.7 21.24 22.27 2.6 15.1 6 2.55 4.83 3.65 2.54 5.08 7.62 0.094 0.047 0.014 0.028 0.024 0.095 0.193 0.295 0.396 0.657 0.386 0.877 0.102 0.594 0.236 0.100 0.190 (typ.) 0.144 0.100 0.200 0.300 16.9 14.92 21.54 22.52 2.8 15.5 6.35 0.2 2.8 5.08 0.668 0.587 0.848 0.891 0.110 0.610 0.250 0.008 0.110 0.200 Heptawatt V L E L1 M1 A C D1 L5 L2 L3 E E1 F V V D M H2 V4 L9 H3 H1 Dia. G G1 G2 F L7 L6 L4 H2 F1 HEPTAMEC 6/8 TDA7240A DIM. A C D D1 E F F1 G G1 G2 H2 H3 L L1 L2 L3 L5 L6 L7 L9 Dia 3.65 2.6 15.1 6 4.44 3.85 0.144 10.05 14.2 4.4 15.8 5.1 3 15.8 6.6 0.102 0.594 0.236 0.175 0.152 2.4 1.2 0.35 0.6 2.41 4.91 7.49 2.54 5.08 7.62 mm MIN. TYP. MAX. 4.8 1.37 2.8 1.35 0.55 0.8 0.9 2.67 5.21 7.8 10.4 10.4 0.396 0.559 0.173 0.622 0.201 0.118 0.622 0.260 0.094 0.047 0.014 0.024 0.095 0.193 0.295 0.100 0.200 0.300 MIN. inch TYP. MAX. 0.189 0.054 0.110 0.053 0.022 0.031 0.035 0.105 0.205 0.307 0.409 0.409 OUTLINE AND MECHANICAL DATA Heptawatt H 7/8 TDA7240A Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics HEPTAWATTTM is a Trademark of SGS-THOMSON Microelectronics (c) 1998 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com 8/8 |
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