TDA7241B 20W BRIDGE AMPLIFIER FOR CAR RADIO VERY LOW STAND-BY CURRENT GAIN = 32dB OUTPUT PROTECTED AGAINST SHORT CIRCUITS TO GROUND AND ACROSS LOAD COMPACT HEPTAWATT PACKAGE DUMP TRANSIENT THERMAL SHUTDOWN LOUDSPEAKER PROTECTION HIGH CURRENT CAPABILITY LOW DISTORTION / LOW NOISE DESCRIPTION The TDA7241B 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 TDA7241B occupies little space on the printed circuit board. Reliable operation is guaranteed by a compre- Heptawatt ORDERING NUMBER: TDA7241BH hensive 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 TDA7241B protects the loudspeaker when one output is short-circuited to ground. Figure 1: Test and Appliication Circuit July 1997 1/7 TDA7241B PIN CONNECTION (Top view) ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit 18 V VS Operating Supply Voltage VS DC Supply Voltage 28 V VS Peak Supply Voltage (t = 50ms) 40 V IO Peak Output Current (non repetitive t = 0.1ms) 4.5 A IO Peak Output Current (repetitive f > 10Hz) 3.5 A Ptot Power Dissipation at Tcase = 85°C Tstg, Tj Storage and Junction Temperature 16 W -40 to 150 °C THERMAL DATA Symbol Rth j-case 2/7 Description Thermal Resistance Junction-case Max Value Unit 4 °C/W TDA7241B ELECTRICAL CHARACTERISTICS (Refer to the circuit of Fig. 1; VS = 14.4V; Rth (heatsink) = 4°C/W, T amb = 25°C, unless otherwise specified Symbol Parameter VS Supply Range Id Total Quiescent Current VOS Output Offset Voltage PO Output Power d GV SVR En Distortion Test Condition . f = 1KHz d = 10% . R L = 2Ω RL = 4Ω R L = 8Ω 0.1 R L = 8Ω PO = 50mW to 6W 0.05 f = 1KHz Voltage Gain f = 1KHz Supply Voltage Rejection f =100Hz Rg = 10KΩ Total Input Noise B = Curve A f = 1KHz Input Sensitivity f = 1KHz PO = 2W fL Low Frequency Roll Off (-3dB) PO = 15W RL = 4Ω fH High Frequency Roll Off (-3dB) PO = 15W RL = 4Ω AS Stand-by Attenuation VO = 2Vrms mV W 0.5 % % dB 2 µV 65 Input Resistance mA 50 R L = 4Ω PO = 20W Vi 80 100 40 3 Ri V 32 B = 22Hz to 22KHz RS = 10KΩ Stand-by Current Unit 18 31 R g = 10KΩ Isb (*) B = Curve 18 Max. 26 20 12 f = 1KHz R L = 4Ω PO = 50mW to 12W Efficiency T sd Typ. R L = 4Ω η VTH(pin.2) Min. f = 1KHz 33 10 70 70 mV 30 Hz KHz 90 Stand-by Threshold Thermal Shutdown Junction Temp. µA KΩ 25 70 mV % 100 R L = 4Ω dB dB 1 150 V °C (**) B = 22Hz to 22KHz Figure 2: P.C. Board and Component Layout of the Circuit of Fig. 1 (1:1 scale). 3/7 TDA7241B Figure 3: Output Power vs. Supply Voltage Figure 4: Output Power vs. Supply Voltage Figure 5: Distortion vs. Output Power Figure 6: Distortion vs. Output Power Figure 7: Distortion vs. Output Power Figure 8: SVR vs. Frequency R g = 10kΩ R g = 0Ω 4/7 TDA7241B Figure 9: Power Dissipation and Efficiency vs. Output Power Figure 10: Power Dissipation and Efficiency vs. Output Power 5/7 TDA7241B HEPTAWATT PACKAGE MECHANICAL DATA DIM. A C D D1 2.4 1.2 E F 0.35 0.6 0.55 0.8 2.41 4.91 7.49 0.9 2.67 5.21 7.8 10.4 0.095 0.193 0.295 10.4 0.396 H3 L L1 L2 L3 L5 L6 L7 M M1 Dia 6/7 mm TYP. MAX. 4.8 1.37 2.8 1.35 F1 G G1 G2 H2 MIN. 2.54 5.08 7.62 10.05 MIN. 0.094 0.047 MAX. 0.189 0.054 0.110 0.053 0.014 0.024 0.022 0.031 0.035 0.105 0.205 0.307 0.409 0.100 0.200 0.300 0.409 16.97 0.668 14.92 21.54 22.62 0.587 0.848 0.891 2.6 15.1 6 3 15.8 6.6 0.102 0.594 0.236 2.8 0.118 0.622 0.260 0.110 5.08 3.65 inch TYP. 0.200 3.85 0.144 0.152 TDA7241B 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. 1997 SGS-THOMSON Microelectronics - All Rights Reserved HEPTAWATT is a Trademark of SGS-THOMSON Microelectronics SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 7/7