TDA7240AV

TDA7240A ® .. . .. .. . 20W BRIDGE AMPLIFIER FOR CAR RADIO COMPACT HEPTAWATT PACKAGE 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 Heptawatt H Heptawatt V ORDERING NUMBERS: TDA7240AH DESCRIPTION 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 ) s ( ct ) s t( TDA7240AV c u d 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, the TDA7240A protects the loudspeaker when one output is short-circuited to ground. e t le o r P o s b O - u d o r P e t e l o s b O December 1998 1/8 TDA7240A PIN CONNECTION (Top view) c u d e t le ABSOLUTE MAXIMUM RATINGS Symbol Vs Vs Vs Io (*) Io (*) Ptot Tstg, Tj Parameter ) s ( ct Operating Supply Voltage o s b O - DC Supply Voltage Peak Supply Voltage (for 50ms) Peak Output Current (non repetitive t = 0.1ms) u d o Peak Output Current (repetitive f ≥10Hz) r P e Power Dissipation at Tcase = 85°C Storage and Junction Temperature t e l o (*) Internally limited ) s t( o r P Value 18 Unit V 28 40 4.5 3.5 V V A A 16 W –40 to 150 °C Value 4 Unit V s b O THERMAL DATA Symbol Rth j-case 2/8 Parameter Thermal Resistance Junction-case Max. TDA7240A ELECTRICAL CHARACTERISTICS (refer to the circuit of fig. 1, Tamb = 25°C, Rth (heatsink) = 4°C/W, Vs = 14.4V) Symbol Vs Vos Parameter Supply Voltage Test Conditions Min. Typ. Output Offset Voltage 65 Id Total Quiescent Current RL = 4Ω Po Output Power f = 1kHz; d = 10% 18 10 RL = 4Ω RL = 8Ω d Distortion GV SVR Voltage Gain Supply Voltage Rejection EN Total Input Noise 20 12 W W 0.5 % RL = 8Ω Po = 50mW to 12W f = 1KHz f = 1kHz 0.05 0.5 % 40 40 40.5 dB dB f = 100Hz 39.5 35 Rg = 10KΩ Rg = 10KΩ Ri Input Resistance f = 1kHz Vi Input Sensitivity f = 1kHz; Po = 2W; RL = 4Ω fL Low Frequency Roll Off (–3dB) High Frequency Roll Off (–3dB) Stand-by Attenuation Stand-by Threshold Po = 15W; RL = 4Ω Po = 15W; RL = 4Ω Efficiency (*) B= Curve A mV mA 0.1 Stand-by Current VTH (pin2) 150 120 f = 1kHz η Isb As Unit V RL = 4Ω Po = 50mW to 12W 2 3 (*) (**) fH Max. 18 RL = 4Ω 10 od 200 70 Vo = 2Vrms (**) B = 22Hz to 22 KHz ) s ( ct uc 65 f = 1KHz Pr 28 o s b O - e t le % µA kΩ mV 30 25 70 ) s t( µV µV Hz kHz 90 1 dB V u d o r P e Figure 2 : P.C. Board and Components layout of the Circuit of Fig. 1.(1:1scale) t e l o s b O 3/8 TDA7240A APPLICATION SUGGESTION The recommended values of the components are those shown on application circuit of Fig. 1. Different values can be used, the following table can help the designer. Component Recommended Value Purpose R1, R2 2.2Ω Frequency Stability Danger of High Frequency Oscillation C1 1µF Input DC Decoupling Higher Turn On and Stand-by Delay C2 22µF Ripple Rejection Increase of SVR Increase of the Turn On Delay C3 22µF Feedback low Frequency Cutoff Higher Low Frequency Cutoff C6, C7 0.22µF Frequency Stability Danger of Oscillation C4 220µF Supply Filter Danger of Oscillation C5 0.1µF Supply Bypass Danger of Oscillation Figure 3 : Output Power vs. Supply Voltage. Larger Than u d o r P e Figure 5 : Output Power vs. Supply voltage. t e l o s b O 4/8 Higher Turn On Pop. Higher Low Frequency Cutoff Degradation of SVR c u d Figure 4 : Distortion vs. Output Power. e t le ) s ( ct Smaller Than o r P o s b O - Figure 6 : Distortion vs. Output Power. ) s t( 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. c u d e t le ) s ( ct ) s t( o r P o s b O - u d o r P e t e l o s b O 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. 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 2.54 5.08 7.62 16.9 14.92 21.54 22.52 2.8 15.5 6.35 0.2 2.8 5.08 3.65 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 inch TYP. MIN. 0.094 0.047 0.014 0.028 0.024 0.095 0.193 0.295 0.100 0.200 0.300 0.396 0.657 0.668 0.587 0.848 0.891 0.386 0.877 0.102 0.594 0.236 0.110 0.610 0.250 0.008 0.110 0.200 3.05 0.100 5.33 0.190 40˚ (typ.) 3.85 0.144 0.860 0.896 0.051 0.118 0.622 0.260 ) s ( ct u d o r P e t e l o s b O H3 o r P e t le o s b O - V V E M1 M D D1 H2 L2 L5 L3 F E E1 V4 L9 G H1 G1 G2 Dia. F L4 L7 L6 6/8 ) s t( Heptawatt V 0.152 L1 C c u d 0.120 0.210 L A OUTLINE AND MECHANICAL DATA 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 H2 F1 HEPTAMEC TDA7240A mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 4.8 0.189 C 1.37 0.054 D 2.4 2.8 0.094 0.110 D1 1.2 1.35 0.047 0.053 E 0.35 0.55 0.014 0.022 F 0.6 0.8 0.024 0.031 F1 0.9 0.035 G 2.41 2.54 2.67 0.095 0.100 0.105 G1 4.91 5.08 5.21 0.193 0.200 0.205 G2 7.49 7.62 7.8 0.295 0.300 0.307 H2 10.4 H3 10.05 L 10.4 0.409 0.396 0.409 14.2 0.559 L1 4.4 0.173 L2 15.8 0.622 L3 5.1 2.6 3 0.102 0.118 L6 15.1 15.8 0.594 0.622 L7 6 6.6 0.236 0.260 4.44 Dia 3.65 c u d 0.201 L5 L9 OUTLINE AND MECHANICAL DATA 0.144 o r P Heptawatt H 0.175 3.85 ) s t( e t le 0.152 ) s ( ct o s b O - u d o r P e t e l o s b O 7/8 TDA7240A c u d e t le ) s ( ct ) s t( o r P o s b O - u d o r P e t e l o s b O 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 HEPTAWATT is a Trademark of SGS-THOMSON Microelectronics © 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