TDA7372B 4 x 6W POWER AMPLIFIER FOR CAR RADIO ADVANCE DATA HIGH POWER CAPABILITY: 4x6W min/4Ω @14.4V, 1KHz, 10% 4x10W typ/2Ω @14.4V, 1KHz, 10% MINIMUM EXTERNAL COMPONENT COUNT - INTERNALLY FIXED GAIN (40dB) - NO BOOTSTRAP CAPACITORS - NO EXTERNAL COMPENSATION ST-BY FUNCTION (CMOS COMPATIBLE) MUTE FUNCTION (CMOS COMPATIBLE) NO AUDIBLE POP DURING MUTE/ST-BY OPERATIONS LOW SUPPLY SELF MUTING PROGRAMMABLE TURN ON DELAY PROTECTIONS: AC OUTPUT SHORT CIRCUIT TO GND DC OUTPUT SHORT CIRCUIT TO GND AND TO VS AT POWER ON SOFT THERMAL LIMITER OVERRATING CHIP TEMPERATURE LOAD DUMP VOLTAGE BLOCK DIAGRAM April 1995 MULTIWATT15 ORDERING NUMBER: TDA7372B FORTUITOUS OPEN GND REVERSE BATTERY ESD PROTECTION DESCRIPTION The TDA7372B is a new technology class AB quad channels Audio Power Amplifier in Multiwatt15 package designed for car radio applications. Thanks to the fully complementary PNP/NPN output configuration the TDA7372B delivers a rail to rail voltage swing with no need of boostrap capacitors. 1/10 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. TDA7372B PIN CONNECTION (Top view) ABSOLUTE MAXIMUM RATINGS Symbol Value Unit VS DC Supply Voltage Parameter 28 V VOP Operating Supply Voltage 18 V Peak Supply Voltage (t = 50ms) 50 V IO Output Peak Current (not rep. t = 100µs) 4 A IO Output Peak Current (rep. f > 10Hz) 3 A VPEAK Ptot Tstg, Tj Power Dissipation (Tcase = 85°C) Storage and Junction Temperature 32 W -40 to 150 °C THERMAL DATA Symbol Rth j-case 2/10 Description Thermal Resistance Junction-case Max Value Unit 2 °C/W TDA7372B ELECTRICAL CHARACTERISTICS (Refer to the test circuit; VS = 14.4V; RL = 4Ω, Tamb = 25°C, f = 1kHz, unless otherwise specified) Symbol VS Id PO Parameter Supply Range Total Quiescent Drain Current Output Power d Distortion CT Cross Talk R IN GV GV BW ENO SVR ASB ISB IPIN 7 VSB IN VSB OUT AM VM IN VM OUT Input Impedance Voltage Gain Voltage Gain Match. Bandwidth Output Noise Voltage (*) Supply Voltage Rejection Stand-by Attenuation ST-BY Current Consumption ST-BY Pin Current ST-BY IN Threshold Voltage ST-BY OUT Threshold Voltage MUTE Attenuation MUTE IN Threshold Voltage MUTE OUT Threshold Voltage Test Condition R L = 4Ω; THD = 10% each channel R L = 2Ω; THD = 10% each channel R L = 4Ω; PO = 0.1 to 3W f = 1kHz; Rg = 0 f = 10kHz; Rg = 0 Min. 8 Typ. 6 6.5 Unit V mA W 10 W 0.08 45 Max. 18 150 0.5 50 40 35 40 1 @ -3dB Rg = 0 R g = 0; f = 100Hz 75 300 45 80 Vpin7 = 1.5V Play mode; Vpin7 = 5V Output Under Short (Max driving current under fault) 100 50 5 1.5 3.5 80 1.5 3.5 % dB dB KΩ dB dB KHz µV dB dB µA µA mA V V dB V V (*) 22Hz to 22KHz 3/10 TDA7372B TEST AND APPLICATION CIRCUIT R2 10µF C13 If high source resistance is present (e.g. passive audio controls) it might be necessary to add C = 470pF from each input pin to S-GND to prevent instability phenomena. Figure 1: P.C. Board and components layout of the Test and Application Circuit (1:1 scale) 4/10 TDA7372B Figure 2: Quiescent Drain Current vs. Supply Voltage Figure 3: Output Power vs. Supply Voltage Figure 4: Output Power vs Supply Voltage Figure 5: Output power vs. Frequency vs.COUT Value Figure 6: Distortion vs. Output Power Figure 7: Distortion vs. Output Power 5/10 TDA7372B Figure 8: Distortion vs. Frequency Figure 9: Distortion vs. Frequency Figure 10: Cross-Talk vs. Frequency Figure 11: SupplyVoltage Rejection vs. Frequency Figure 12: Total Power Dissipation and Efficiency Figure 13: Total Power Dissipation and Efficiency vs. Output Power Ptot (W) Ptot (W) Ptot Ptot 6/10 TDA7372B 10µF Figure 14: TDA7317 + 7372 Application Circuit. 7/10 TDA7372B FUNCTIONAL DESCRIPTION Function Description GENERAL The TDA7372B is a quad channel single package audio power amplifier intended to reduce the mismatch in the electrical characteristics among the four different channels and to consistently drop the external component count. It contains four non inverting stages whose gain is internally fixed to 40dB. OUTPUT STAGE The output stage is a single ended type suitable to drine 4Ω loads. It consists of a class AB fully complementary PNP/NPN stages short circuit protected. A rail to rail output swing is achieved without need of boostrap capacitors. Moreover, the external compensation is not necessary. ST-BY The device features a St-BY function which shuts down the internal bias supplies when the STBY input is low. In ST-BY mode the amplifier sinks a small current (in the range of few µAs). When the St-BY pin is high the IC becomes fully operational. MUTE A mute function is also provided. This reduces the gain of the input stage to a level effectively eliminating any audio input influence on the output stage when the mute line is low. When the mute line is high the normal input path is restored. The device goes automatically is mute status when the supply voltage goes below the minimum allowed value. This prevents pop noises whenever the battery voltage drops below a fixed threshold. When the supply voltage rises to its nominal value the device recovers the play condition with a delay fixed by the C SVR capacitor. THERMAL PROTECTION The Thermal protection principle involves two different steps a) Soft thermal limitation b) Shutdown Until the juntion temperature remains below a preset threshold, the I.C. will deliver the full power. Once the threshold has been reached, the device automatically goes, into mute status. The play to mute transition is internally controlled so producing a soft muting without unpleasent effect. Supposing the junction temperature does not reduce to safe levels a complete shutdown will occur. BUILT-IN SHORT CIRCUIT PROTECTION Reliable and safe operation in presence of: - AC short circuit to GND - DC short circuit to GND and to VS during power-on phase is assured by a built-in protection circuitry. the DC short protector acts in such a way to avoid the device is turned on (by ST-BY) when a DC short is present between out to GND or out to VS. Due to this reason it is necessary to introduce a proper delay on the st-by pin (expecially when it is driven by VS.) More over, as the involved circuitry is normally disabled when a current higher than 5mA is flowing into the st-by pin, it is important, in order not to disable it, to have the external current source driving the pin it self limited to 5mA. (figure 1 is showing relevant waveforms). Figure 15: Fault (DC short) waveforms 8/10 TDA7372B MULTIWATT15 PACKAGE MECHANICAL DATA mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 5 0.197 B 2.65 0.104 C 1.6 D 0.063 1 E 0.49 0.039 0.55 0.019 0.022 F 0.66 0.75 0.026 G 1.02 1.27 1.52 0.040 0.050 0.060 G1 17.53 17.78 18.03 0.690 0.700 0.710 H1 19.6 0.772 H2 L 0.030 20.2 0.795 21.9 22.2 22.5 0.862 0.874 0.886 L1 21.7 22.1 22.5 0.854 0.870 L2 17.65 18.1 0.695 L3 17.25 17.5 17.75 0.679 0.689 0.699 L4 10.3 10.7 10.9 0.406 0.421 0.429 L7 2.65 2.9 0.104 0.886 0.713 0.114 M 4.25 4.55 4.85 0.167 0.179 M1 4.63 5.08 5.53 0.182 0.200 S 1.9 2.6 0.075 0.191 0.218 0.102 S1 1.9 2.6 0.075 0.102 Dia1 3.65 3.85 0.144 0.152 9/10 TDA7372B 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. 1994 SGS-THOMSON Microelectronics - All Rights Reserved MULTIWATT is a Registered Trademark of the 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. 10/10