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| (R) TDA7375A 2 x 37W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO HIGH OUTPUT POWER CAPABILITY 2 x 43W/4 MAX 2 x 37W/4 EIAJ 2 x 26W/4 @14.4V, 1KHz, 10% 4 x 7W/4 @14.4V, 1KHz, 10% 4 x 12W/2 @14.4V, 1KHz, 10% MINIMUM EXTERNAL COMPONENTS COUNT: - NO BOOTSTRAP CAPACITORS - NO BOUCHEROT CELLS - INTERNALLY FIXED GAIN (26dB BTL) ST-BY FUNCTION (CMOS COMPATIBLE) NO AUDIBLE POP DURING ST-BY OPERATIONS DIAGNOSTIC FACILITIES - CLIP DETECTOR - OUT TO GND SHORT - OUT TO VS SHORT - SOFT SHORT AT TURN-ON - THERMAL SHUTDOWN PROXIMITY Protections: OUPUT AC/DC SHORT CIRCUIT - TO GND BLOCK DIAGRAM Multiwatt15 V ORDERING NUMBERS: TDA7375AV TDA7375AH - TO VS - ACROSS THE LOAD SOFT SHORT AT TURN-ON OVERRATING CHIP TEMPERATURE WITH SOFT THERMAL LIMITER LOAD DUMP VOLTAGE SURGE VERY INDUCTIVE LOADS FORTUITOUS OPEN GND REVERSED BATTERY ESD October 1998 1/14 TDA7375A DESCRIPTION The TDA7375A is a new technology class AB car radio amplifier able to work either in DUAL BRIDGE or QUAD SINGLE ENDED configuration. The exclusive fully complementary structure of the output stage and the internally fixed gain guaranABSOLUTE MAXIMUM RATINGS Symbol Vop VS Vpeak IO IO Ptot Tstg, Tj Operating Supply Voltage DC Supply Voltage Peak Supply Voltage (for t = 50ms) Output Peak Current (not repitive t = 100s) Output Peak Current (repetitive f > 10Hz) Power Dissipation Tcase = 85C Storage and Junction Temperature Parameter Value 18 28 40 4.5 3.5 36 -40 to 150 Unit V V V A A W C tee the highest power performances with extremely reduced component count. The on board clip detector simplifies gain compression operation. The fault diagnostic makes it possible to detect mistakes during car radio set assembly and wiring in the car. GENERAL STRUCTURE THERMAL DATA Symbol Rth j-case Description Thermal Resistance Junction-case Max Value 1.8 Unit C/W PIN CONNECTION (Top view) 2/14 TDA7375A ELECTRICAL CHARACTERISTICS (Refer to the test circuit, VS = 14.4V; RL = 4; f = 1KHz; T amb = 25C, unless otherwise specified Symbol VS Id VOS PO Parameter Supply Voltage Range Total Quiescent Drain Current Output Offset Voltage Output Power THD = 10%; RL = 4 Bridge Single Ended Single Ended, RL = 2 VS = 14.4V, Bridge VS = 13.7V, Bridge R L = 4 Single Ended, PO = 0.1 to 4W Bridge, PO = 0.1 to 10W f = 1KHz Single Ended f = 10KHz Single Ended f = 1KHz Bridge f = 10KHz Bridge R IN GV GV EIN Input Impedance Voltage Gain Voltage Gain Match Input Noise Voltage R g = 0; "A" weighted, S.E. Non Inverting Channels Inverting Channels Bridge Rg = 0; 22Hz to 22KHz SVR A SB ISB V SB V SB Ipin7 Supply Voltage Rejection Stand-by Attenuation ST-BY Current Consumption ST-BY In Threshold Voltage ST-BY Out Threshold Voltage ST-BY Pin Current Play Mode V pin7 = 5V Max Driving Current Under Fault (*) Icd off Icd on Vsat pin10 Clipping Detector Output Average Current Clipping Detector Output Average Current Voltage Saturation on pin 10 d = 1% (**) d = 5% (**) Sink Current at Pin 10 = 1mA 90 160 0.7 3.5 50 5 R g = 0; f = 300Hz PO = 1W VST-BY = 0 to 1.5V 50 80 90 100 1.5 2 5 3.5 Single Ended Bridge Single Ended Bridge 55 60 20 10 19 25 30 15 20 26 21 27 0.5 23 6.5 37 33 26 7 12 43 37 0.02 0.03 70 60 RL = Test Condition Min. 8 Typ. Max. 18 150 150 Unit V mA mV W W W W W % % dB dB dB dB K K dB dB dB V V V dB dB A V V A mA A A V PO max PO EIAJ THD Max. Output Power (***) EIAJ Output Power (***) Distortion 0.3 CT Cross Talk (*) See built-in S/C protection description (**) Pin 10 Pulled-up to 5V with 10K; RL = 4 (***) Saturated square wave output. 3/14 TDA7375A STANDARD TEST AND APPLICATION CIRCUIT Figure 1: Quad Stereo 10K R1 ST-BY C7 10F IN FL C1 0.22F IN FR C2 0.22F IN RL C4 0.22F 12 15 11 C3 0.22F 6 C8 47F 8 9 14 10 C12 2200F D94AU063A C6 100nF 7 13 3 1 VS C5 1000F 4 C10 2200F 5 2 C9 2200F OUT FL OUT FR Note: The output decoupling capacitors (C9,C10,C11,C12) could be reducedto 1000F if t he 2 operation is not required. IN RR C11 2200F OUT RL OUT RR DIAGNOSTICS Figure 2: Double Bridge 10K R1 ST-BY C5 10F IN L C1 0.47F IN R C2 0.47F 4 5 12 11 6 C8 47F 8 9 10 DIAGNOSTICS D94AU064A C4 100nF 7 13 3 1 VS C3 1000F OUT L 2 15 OUT R 14 Figure 3: Stereo/Bridge 10K ST-BY 10F 7 13 3 100nF VS 1000F IN L 0.22F IN L 0.22F IN BRIDGE 0.47F 4 1 2200F OUT L 5 2 2200F OUT R 12 11 6 47F 8 9 10 15 OUT BRIDGE 14 DIAGNOSTICS D94AU065A 4/14 TDA7375A Figure 4: P.C. Board and Component Layout of the fig.1 (1:1 scale). Figure 5: P.C. Board and Component Layout of the fig.2 (1:1 scale). 5/14 TDA7375A Figure 6: Quiescent Drain Current vs. Supply Voltage (Single Ended and Bridge). Figure 7: Quiescent Output Voltage vs. Supply Voltage (Single Ended and Bridge). Figure 8: Output Power vs. Supply Voltage Figure 9: Output Power vs. Supply Voltage Figure 10: Output Power vs. Supply Voltage Figure 11: Distortion vs. Output Power 6/14 TDA7375A Figure 12: Distortion vs. Output Power Figure 13: Distortion vs. Output Power Figure 14: Cross-talk vs. Frequency Figure 15: Supply Voltage Rejection vs. Frequency Figure 16: SupplyVoltage Rejection vs. Frequency Figure 17: Stand-byAttenuation vs. Threshold Voltage 7/14 TDA7375A Figure 18: Total Power Dissipation and Efficiency vs. Output Power Figure 19: Total Power Dissipation and Efficiency vs. Output Power. 8/14 TDA7375A High Application Flexibility The availability of 4 independent channels makes it possible to accomplish several kinds of applications ranging from 4 speakers stereo (F/R) to 2 speakers bridge solutions. In case of working in single ended conditions the polarity of the speakers driven by the inverting amplifier must be reversed respect to those driven by non inverting channels. This is to avoid phase inconveniences causing sound alterations especially during the reproduction of low frequencies. Easy Single Ended to Bridge Transition The change from single ended to bridge configurations is made simply by means of a short circuit across the inputs, that is no need of further external components. Gain Internally Fixed to 20dB in Single Ended, 26dB in Bridge Advantages of this design choice are in terms of: components and space saving output noise, supply voltage rejection and distortion optimization. Silent Turn On/Off and Muting/Stand-by Function The stand-by can be easily activated by means of a CMOS level applied to pin 7 through a RC filter. Under stand-by condition the device is turned off completely (supply current = 1A typ.; output attenuation= 80dB min.). Every ON/OFF operation is virtually pop free. Furthemore, at turn-on the device stays in muting condition for a time determined by the value assigned to the SVR capacitor. While in muting the device outputs becomes insensitive to any kinds of signal that may be present at the input terminals. In other words every transient coming from previous stages produces no unplesant acoustic effect to the speakers. OUTPUT STAGE The fully complementary output stage was made possible by the development of a new component: the ST exclusive power ICV PNP. A novel design based upon the connection shown in fig. 20 has then allowed the full exploitation of its possibilities. The clear advantages this new approach has over classical output stages are as follows: Need of Bootstrap Capacitors. The output swing is limited only by the VCEsat of the output transistors, which are in the range of 0.3 (Rsat) each. Classical solutions adopting composite PNPNPN for the upper output stage have higher saturation loss on the top side of the waveform. This unbalanced saturation causes a significant power reduction. The only way to recover power consists of the addition of expensive bootstrap capacitors. Absolute Stability Without Any External Compensation. Referring to the circuit of fig. 20 the gain VOut/VIn is greater than unity, approximately 1+ R2/R1. The DC output (VCC/2) is fixed by an auxiliary amplifier common to all the channels. By controlling the amount of this local feedback it is possible to force the loop gain (A*) to less than unity at frequency for which the phase shift is 180. This means that the output buffer is intrinsically stable and not prone to oscillation. Most remarkably, the above feature has been achieved in spite of the very low closed loop gain of the amplifier. In contrast, with the classical PNP-NPN stage, the solution adopted for reducing the gain at high frequencies makes use of external RC networks, namely the Boucherot cells. Figure 20: The New Output Stage Rail-to-Rail Output Voltage Swing With No BUILT-IN SHORT CIRCUIT PROTECTION Reliable and safe operation, in presence of all kinds of short circuit involving the outputs is assured by BUILT-IN protectors. Additionally to the AC/DC short circuit to GND, to VS, across the speaker, a SOFT SHORT condition is signalled out during the TURN-ON PHASE so assuring cor9/14 TDA7375A rect operation for the device itself and for the loudspeaker. This particular kind of protection acts in such a way to avoid the device is turned on (by ST-BY) when a resistive path (less than 16 ohms) is present between the output and GND. 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 STBY pin limited to 5mA. This extrafunction becomes particularly attractive when, in the single ended configuration, one capacitor is shared between two outputs (see fig. 21). Figure 22: Clipping Detection Waveforms Figure 21. A current sinking at pin 10 is provided when a certain distortion level is reached at each output. This function allows gain compression facility whenever the amplifier is overdriven. Thermal Shutdown In this case the output 10 will signal the proximity of the junction temperature to the shutdown threshold. Typically current sinking at pin 10 will start ~10C before the shutdown threshold is reached. HANDLING OF THE DIAGNOSTIC INFORMAFigure 23: Output Fault Waveforms (see fig. 24) Supposing that the output capacitor C out for any reason is shorted, the loudspeaker will not be damaged being this soft short circuit condition revealed. Diagnostic Facilities The TDA7375 is equipped with a diagnostic circuitry able to detect the following events: Clipping in the output signal Thermal shutdown Output fault: - short to GND - short to VS - soft short at turn on The information is available across an open collector output (pin 10) through a current sinking when the event is detected TDA7375A 10/14 TDA7375A Figure 24: Fault Waveforms ST-BY PIN VOLTAGE 2V t OUT TO Vs SHORT OUTPUT WAVEFORM SOFT SHORT t OUT TO GND SHORT Vpin 10 CORRECT TURN-ON FAULT DETECTION t CHECK AT TURN-ON (TEST PHASE) D94AU149A SHORT TO GND OR TO Vs TION As different kinds of information is available at the same pin (clipping detection, output fault, thermal proximity), this signal must be handled properly in order to discriminate the event. Figure 25: Waveforms This could be done taking into account the different timing of the diagnostic output against different events. Normally the clip detector signalling produces a low level at out 10 that is shorter referred to every ST-BY PIN VOLTAGE t Vs OUTPUT WAVEFORM t Vpin 10 WAVEFORM t CLIPPING D94AU150 SHORT TO GND OR TO Vs THERMAL PROXIMITY 11/14 TDA7375A kind of fault detection; based on this assumption an interface circuitry to differentiate the information is represented in the following schematic. Figure 26. TDA7375A 12/14 TDA7375A mm MIN. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 0.49 0.66 1.02 17.53 19.6 21.9 21.7 17.65 17.25 10.3 2.65 4.25 4.63 1.9 1.9 3.65 22.2 22.1 17.5 10.7 4.55 5.08 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.53 2.6 2.6 3.85 1.27 17.78 1 0.55 0.75 1.52 18.03 0.019 0.026 0.040 0.690 0.772 0.862 0.854 0.695 0.679 0.406 0.104 0.167 0.182 0.075 0.075 0.144 0.874 0.870 0.689 0.421 0.179 0.200 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.218 0.102 0.102 0.152 0.050 0.700 TYP. MAX. 5 2.65 1.6 0.039 0.022 0.030 0.060 0.710 MIN. inch TYP. MAX. 0.197 0.104 0.063 DIM. OUTLINE AND MECHANICAL DATA Multiwatt15 V 13/14 TDA7375A 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 (c) 1998 STMicroelectronics - Printed in Italy - All Rights Reserved MULTIWATT (R) is a Registered Trademark of the STMicroelectronics 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 14/14 |
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