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| TDA7375A 2 X 37W DUAL/QUAD POWER AMPLIFIER FOR CAR RADIO 1 FEATURES HIGH OUTPUT POWER CAPABILITY: - 2 x 43W max./4 - 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 DIAGNOSTICS FACILITY FOR: - - - - - CLIPPING OUT TO GND SHORT OUT TO VS SHORT SOFT SHORT AT TURN-ON THERMAL SHUTDOWN PROXIMITY Figure 1. Package MULTIWATT15 Table 1. Order Codes Part Number TDA7375AV Package MULTIWATT 15 (Vertical) 2 PROTECTIONS: OUPUT AC/DC SHORT CIRCUIT - TO GND - 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 Figure 2. Block Diagram March 2005 Rev. 2 1/15 TDA7375A 3 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 guarantee the highest possible power performances with extremely reduced component count. The on-board clip detector simplifies gain compression operation. The fault diagnostics makes it possible to detect mistakes during car radio set assembly and wiring in the car. Table 2. Absolute Maximum Ratings Symbol Vop VS Vpeak IO IO Ptot Tstg, Tj Parameter Operating Supply Voltage DC Supply Voltage Peak Supply Voltage (for t = 50ms) Output Peak Current (not repetitive t = 100s) Output Peak Current (repetitive f > 10Hz) Power Dissipation (Tcase = 85C) Storage and Junction Temperature Value 18 28 40 4.5 3.5 36 -40 to 150 Unit V V V A A W C Table 3. Thermal Data Symbol Rth j-case Parameter Thermal Resistance Junction-case max Value 1.8 Unit C/W Figure 3. Pin Connection (Top view) 2/15 TDA7375A Table 4. Electrical Characteristcs (Refer to the test circuit, VS = 14.4V; RL = 4; f = 1KHz; Tamb = 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 RL = 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 RIN GV GV EIN Input Impedance Single Ended Bridge Voltage Gain Single Ended Bridge Voltage Gain Match Input Noise Voltage Rg = 0; "A" weighted, S.E. Non Inverting Channels Inverting Channels Bridge Rg = 0; 22Hz to 22KHz SVR ASB ISB VSB VSB 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 Vpin7 = 5V Max Driving Curr. Under Fault (*) Icd Test Condition RL = Min. 8 Typ. Max. 18 150 150 Unit V mA mV W W W W W % % dB dB dB 23 6.5 37 33 25 7 12 43 37 0.02 0.03 70 60 PO max PO EIAJ THD Max. Output Power (***) EIAJ Output Power (***) Distortion 0.3 CT Cross Talk 55 60 20 10 19 25 30 15 20 26 21 27 0.5 2 5 3.5 50 80 90 100 1.5 3.5 50 5 90 160 0.7 dB K K dB dB dB V V V dB dB A V V A mA A A V Rg = 0; f = 300Hz PO = 1W VST-BY = 0 to 1.5V off 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 Icd on Vsat pin10 (*) See built-in S/C protection description (**) Pin 10 Pulled-up to 5V with 10K; RL = 4 (***) Saturated square wave output. 3/15 TDA7375A 4 STANDARD TEST AND APPLICATION CIRCUIT Figure 4. Quad Stereo 10K R1 ST-BY C7 10F IN FL C1 0.22F IN FR C2 0.22F IN RL C4 0.22F IN RR 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 15 C11 2200F OUT FL 12 OUT FR OUT RL Note: The output decoupling capacitors (C9,C10,C11,C12) could be reduced to 1000F if the 2 operation is not required. OUT RR DIAGNOSTICS Figure 5. 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 6. 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 4/15 TDA7375A Figure 7. P.C. Board and Component Layout of the fig.4 Figure 8. P.C. Board and Component Layout of the fig.5 5/15 TDA7375A Figure 9. Quiescent Drain Current vs. Supply Voltage (Single Ended and Bridge). Figure 12. Output Power vs. Supply Voltage Figure 10. Quiescent Output Voltage vs. Supply Voltage (Single Ended and Bridge). Figure 13. OutputPower vs. Supply Voltage Figure 11. Output Power vs. Supply Voltage Figure 14. Distortion vs. Output Power 6/15 TDA7375A Figure 15. Distortion vs. Output Power Figure 18. Supply Voltage Rejection vs. Frequency Figure 16. Distortion vs. Output Power Figure 19. Supply Voltage Rejection vs. Frequency Figure 17. Cross-talk vs. Frequency Figure 20. Stand-by Attenuation vs. Threshold Voltage 7/15 TDA7375A Figure 21. Total Power Dissipation and Efficiency vs. Output Power Figure 22. Total Power Dissipation and Efficiency vs. Output Power 5 GENERAL STRUCTURE 5.1 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. 5.2 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. 5.3 Gain Internally Fixed to 20dB in Single Ended, 26dB in Bridge Advantages of this design choice are in terms of: componentsand space saving output noise, supply voltage rejection and distortion optimization. 5.4 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 unplesantacoustic effect to the speakers. 5.5 OUTPUT STAGE The fully complementary output stage was made possible by the development of a new component: the 8/15 TDA7375A ST exclusive power ICV PNP. A novel design based upon the connection shown in fig. 23 has then allowed the full exploitation of its possibilities. The clear advantagesthis new approach has over classical output stages are as follows: 5.5.1 Rail-to-Rail Output Voltage Swing With No Need of Bootstrap Capacitors. The output swing is limited only by the VCEsat of the output transistors, which is in the range of 0.3 (Rsat) each. Classical solutions adopting composite PNP-NPN 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. 5.5.2 Absolute Stability Without Any External Compensation. Referring to the circuit of fig. 23 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 feedbackit 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 stableand 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. 5.6 BUILT-IN SHORTCIRCUIT PROTECTION Figure 23. The New Output Stage 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 correct operation for the device itself and for the loudspeaker. This particular kind of protection acts in a way to avoid that 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 ST-BY pin limited to 5mA. This extrafunction becomes particularly attractive when, in the single ended configuration, one capacitor is shared between two outputs (see fig. 24). Supposing that the output capacitor Cout for anyreason is shorted, the loudspeaker will not be damaged being this soft short circuit condition revealed. 9/15 TDA7375A Figure 24. 5.6.1 Diagnostics Facility The TDA7375A 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 A current sinking at pin 10 is triggered when a certain distortion level is reached at any of the outputs. This function allows gain compression possibility whenever the amplifier is overdriven. 5.6.2 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. Figure 25. Clipping Detection Waveforms 10/15 TDA7375A Figure 26. Output Fault Waveforms (see fig. 27) Figure 27. Fault Waveforms 5.7 HANDLING OF THE DIAGNOSTICS INFORMATION As various 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 each event. This could be done by taking into account the different timing of the diagnostic output during each case. Normally the clip detector signalling produces a low level at pin 10 that is shorter referred to everyt kind of fault detection; based on this assumption an interface circuitry to differentiate the information 11/15 TDA7375A is representedin the following schematic.Waveforms Figure 28. 12/15 TDA7375A Figure 29. Multiwatt 15 Mechanical Data & Package Dimensions DIM. A5 B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.65 17.25 10.3 2.65 4.25 4.73 1.9 1.9 3.65 4.55 5.08 17.5 10.7 22.2 22.1 0.49 0.66 1.02 17.53 19.6 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.43 2.6 2.6 3.85 0.862 0.854 0.695 0.679 0.406 0.104 0.167 0.186 0.075 0.075 0.144 0.179 0.200 0.689 0.421 0.874 0.87 1.27 17.78 1 0.55 0.75 1.52 18.03 0.019 0.026 0.040 0.690 0.772 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.214 0.102 0.102 0.152 0.050 0.700 2.65 1.6 0.039 0.022 0.030 0.060 0.710 mm MIN. TYP. MAX. MIN. inch TYP. MAX. 0.197 0.104 0.063 OUTLINE AND MECHANICAL DATA Multiwatt15 (Vertical) 0016036 J 13/15 TDA7375A 6 REVISION HISTORY Table 5. Revision History Date July 2004 March 2005 Revision 1 2 First Issue in EDOCS Changed the Style-sheet in compliance to the new "Corporate Technical Pubblications Design Guide". Deleted package Mukltiwatt15 Horizontal Description of Changes 14/15 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. Specifications 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. All other names are the property of their respective owners (c) 2005 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 15/15 |
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