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february 2012 doc id 6325 rev 4 1/20 1 tda7375av 2 x 37 w dual/quad power amplifier for car radio features high output power capability ? 2 x 43 w max./4 ?2 x 37 w/4 eiaj ?2 x 26 w/4 @14.4 v, 1 khz, 10 % ?4 x 7 w/4 @14.4 v, 1 khz, 10 % ?4 x 12 w/2 @14.4 v, 1 khz, 10 % minimum external components count: ? no bootstrap capacitors ? no boucherot cells ? internally fixed gain (26 db btl) ? standby function (cmos compatible) no audible pop during standby operations diagnostics facility for: ? clipping ? out to gnd short ? out to v s short ? soft short at turn-on ? thermal shutdown proximity protections: ? output ac/dc short circuit: to gnd, to v s and 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 description the tda7375av is a 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 . multiwatt15 '!0'03 table 1. device summary order code package packing e-tda7375av multiwat15 tube www.st.com
contents tda7375av 2/20 doc id 6325 rev 4 contents 1 block and pin connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 standard test and application circui ts . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1 high application flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.2 easy single ended to bridge transition . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.3 gain internally fixed to 20 db in single ended, 26 db in bridge . . . . . . . . 13 4.4 silent turn on/off and muting/standby function . . . . . . . . . . . . . . . . . . . . . 13 4.5 output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.5.1 rail-to-rail output voltage swing with no need of bootstrap capacitors . 14 4.5.2 absolute stability without any external compensation . . . . . . . . . . . . . . 14 4.6 built?in short circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 4.6.1 diagnostics facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.6.2 thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.7 handling of the diagnostics information . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
tda7375av list of tables doc id 6325 rev 4 3/20 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 3. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 4. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 5. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
list of figures tda7375av 4/20 doc id 6325 rev 4 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 3. quad stereo circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 4. double bridge circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 5. stereo/bridge circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 6. pcb and component layout of the figure 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 7. pcb and component layout of the figure 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 8. quiescent drain current vs. supply voltage (single ended and bridge). . . . . . . . . . . . . . . . 10 figure 9. quiescent output voltage vs. supply voltage (single ended and bridge) . . . . . . . . . . . . . . 10 figure 10. output power vs. supply voltage (2 , s.e.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 11. output power vs. supply voltage (4 , s.e.). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 12. output power vs. supply voltage (4 , btl) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 13. distortion vs. output power (2 , s.e.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 14. distortion vs. output power (4 , s.e.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 15. distortion vs. output power (4 , btl) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 16. crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 17. supply voltage rejection vs. frequency (btl) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 18. supply voltage rejection vs. frequency (s.e.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 19. standby attenuation vs. threshold voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 figure 20. total power dissipation and efficiency vs. output power (s.e.). . . . . . . . . . . . . . . . . . . . . . 12 figure 21. total power dissipation and efficiency vs. output power (btl). . . . . . . . . . . . . . . . . . . . . . 12 figure 22. the new output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 23. single ended configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 24. clipping detection wave forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 25. output fault waveforms (see figure 26) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 26. fault waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 27. waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 28. interface circuitry to differentiate the information schematic. . . . . . . . . . . . . . . . . . . . . . . . 17 figure 29. multiwatt 15 mechanical data and package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . 18
tda7375av block and pin connection diagrams doc id 6325 rev 4 5/20 1 block and pin connection diagrams figure 1. block diagram figure 2. pin connection (top view)
electrical specification tda7375av 6/20 doc id 6325 rev 4 2 electrical specification 2.1 absolute maximum ratings 2.2 thermal data 2.3 electrical characteristics refer to the test circuit, v s = 14.4v; r l = 4 ; f = 1khz; t amb = 25c, unless otherwise specified. table 2. absolute maximum ratings symbol parameter value unit v op operating supply voltage 18 v v s dc supply voltage 28 v v peak peak supply voltage (for t = 50 ms) 40 v i o output peak current ( not repetitive t = 100 s) 4.5 a i o output peak current (repetitive f > 10 hz) 3.5 a p tot power dissipation (t case = 85 c) 36 w t stg , t j storage and junction temperature -40 to 150 c table 3. thermal data symbol parameter value unit r th j-case thermal resistance junc tion-to-case max 1.8 c/w table 4. electrical characteristics symbol parameter test condition min. typ. max. unit v s supply voltage range - 8 - 18 v i d total quiescent drain current r l = - - 150 ma v os output offset voltage - - - 150 mv p o output power thd = 10 %; r l = 4 bridge single ended single ended, r l = 2 23 6.5 25 7 12 - w w w p o max max. output power (1) v s = 14.4 v, bridge 37 43 w p o eiaj eiaj output power (1) v s = 13.7 v, bridge 33 37 w thd distortion r l = 4 single ended, p o = 0.1 to 4 w bridge, p o = 0.1 to 10 w -0.02 0.03 - 0.3 % %
tda7375av electrical specification doc id 6325 rev 4 7/20 c t cross talk f = 1 khz single ended - 70 - db f = 10 khz single ended - 60 - db f = 1 khz bridge 55 - - db f = 10 khz bridge - 60 - db r in input impedance single ended 20 30 - k bridge 10 15 - k g v voltage gain single ended 19 20 21 db bridge 25 26 27 db g v voltage gain match - - - 0.5 db e in input noise voltage r g = 0; ?a? weighted, s.e. non inverting channels inverting channels -2 5 - v v bridge r g = 0; 22 hz to 22 khz - 3.5 - v svr supply voltage rejection r g = 0; f = 300 hz 50 - - db a sb standby attenuation p o = 1 w 80 90 - db i sb standby current consumption v st-by = 0 to 1.5 v - - 100 a v sb standby in threshold voltage - - 1.5 v v sb standby out threshold voltage 3.5 - - v i pin7 standby pin current play mode v pin7 = 5 v - - 50 a max. driving current under fault (2) --5ma i cd off clipping detector output average current d = 1% (3) -90- a i cd on clipping detector output average current d = 5% (3) - 160 - a v sat pin10 voltage saturation on pin 10 sink current at pin 10 = 1 ma - - 0.7 v 1. saturated square wave output. 2. see built-in s/c protection description 3. pin 10 pulled-up to 5 v with 10 k ; r l = 4 table 4. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
standard test and application circuits tda7375av 8/20 doc id 6325 rev 4 3 standard test and application circuits figure 3. quad stereo circuit figure 4. double bridge circuit figure 5. stereo/bridge circuit # m & $)!'./34)#3 # m & '!0'03 # m & +2 34 "9 ).&, # m & ).&2 # m & ).2, # m & ).22 # m & # m & # n& 6 3 # m & # m & # m & /54&, /54&2 /542, /5422 note: the output decoupling capacitors (c9,c10,c11,c12) could be reduced to 1000 f if the 2 operation is not required. '!0'03 # m & $)!'./34)#3 # m & +2 34 "9 )., # m & ).2 # m & # m & # n& 6 3 /54, /542 '!0'03 m & $)!'./34)#3 m & + 34 "9 )., m & )."2)$'% m & m & n& 6 3 /54, /54 "2)$'% m & )., /542 m & m &
tda7375av standard test and application circuits doc id 6325 rev 4 9/20 figure 6. pcb and component layout of the figure 3 figure 7. pcb and component layout of the figure 4
standard test and application circuits tda7375av 10/20 doc id 6325 rev 4 3.1 electrical characteristics curves figure 8. quiescent drain current vs. supply voltage (single ended and bridge) figure 9. quiescent output voltage vs. supply voltage (single ended and bridge) figure 10. output power vs. supply voltage (2 , s.e.) figure 11. output power vs. supply voltage (4 , s.e.) figure 12. output power vs. supply voltage (4 , btl) figure 13. distortion vs. output power (2 , s.e.)
tda7375av standard test and application circuits doc id 6325 rev 4 11/20 figure 14. distortion vs. output power (4 , s.e.) figure 15. distortion vs. output power (4 , btl) figure 16. crosstalk vs. frequency figure 17. supply voltage rejection vs. frequency (btl) figure 18. supply voltage rejection vs. frequency (s.e.) figure 19. standby attenuation vs. threshold voltage
standard test and application circuits tda7375av 12/20 doc id 6325 rev 4 figure 20. total power dissipation and efficiency vs. output power (s.e.) figure 21. total power dissipation and efficiency vs. output power (btl)
tda7375av functional description doc id 6325 rev 4 13/20 4 functional description 4.1 high application flexibility the availability of 4 i ndependent chann els makes it possible to a ccomplish 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. 4.2 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. 4.3 gain internally fixed to 20 db in single ended, 26 db in bridge advantages of this design choice are in terms of: components and space saving output noise, supply voltage rejection and distortion optimization 4.4 silent turn on/off an d muting/standby function the standby can be easily activated by means of a cmos level applied to pin 7 through a rc filter. under standby conditions the device is tu rned off completely (supply current = 1 a typ.; output attenuation = 80 db min.). every on/off operation is virtually pop free. furthermore, at turn-on the device stays in muting conditions for a time determined by the value assigned to the svr capacitor. while in muting the device outputs become insensitive to any kind of signal that may be present at the input terminals. in other words every transient coming from previous stages doesn't produce unpleasant acoustic effects to the speakers. 4.5 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 figure 22 has then allowed the full exploitation of its possibilities. the clear ad vantages that this new approach has over classical output stages are described below.
functional description tda7375av 14/20 doc id 6325 rev 4 4.5.1 rail-to-rail output voltage sw ing with no need of bootstrap capacitors the output swing is limited only by the v cesat of the output transistors, which is in the range of 0.3 (r sat ) 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. 4.5.2 absolute stability wit hout any external compensation referring to the circuit of figure 22 the gain v out /v in is greater than unity, approximately 1+r2/r1. the dc output (v cc /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 cont rast, 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. 4.6 built?in short circuit protection figure 22. 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 v s , across the speaker, a soft sh ort condition is si gnalled 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 standby) 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 5 ma 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 5 ma. this extra function becomes particularly attr active when, in the single ended configuration, one capacitor is shared between two outputs (see figure 23 ). supposing that the output
tda7375av functional description doc id 6325 rev 4 15/20 capacitor c out for any reason is shorted, the loudspeak er will not be damaged being this soft short circuit condition revealed. figure 23. single ended configuration 4.6.1 diagnostics facility the tda7375av 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 v s ? 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 am plifier is over driven. 4.6.2 thermal shutdown in this case the output 10 will signal the proximity of the juncti on temperature to the shutdown threshold. typically current sinking at pin 10 will start ~10 c before the shutdown threshold is reached. figure 24. clipping detection waveforms
functional description tda7375av 16/20 doc id 6325 rev 4 figure 25. output fault waveforms (see figure 26 ) figure 26. fault waveforms 4.7 handling of the diagnostics information as various kinds of information are 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 lo w level at pin 10 that is shorter referred to every kind of fault detection; based on this assu mption an interface circuitry to differentiate the information is represented in the following schematic. 3/&43(/24 /544/6s3(/24 &!5,4$%4%#4)/. #/22%#4452. /. /544/'.$3(/24 t t t 34 "90). 6/,4!'% 6 /54054 7!6%&/2- 6pin #(%#+!4452. /. 4%340(!3% 3(/244/'.$ /24/6s '!0'03
tda7375av functional description doc id 6325 rev 4 17/20 figure 27. waveforms figure 28. interface circuitry to differentiate the information schematic '!0'03 t t t 34 "90). 6/,4!'% 6s /54054 7!6%&/2- 6pin 7!6%&/2- 3(/244/'.$ /24/6s #,)00).' 4(%2-!, 02/8)-)49
package information tda7375av 18/20 doc id 6325 rev 4 5 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 29. multiwatt 15 mechanical data and package dimensions '!0'03 /54,).%!.$ -%#(!.)#!,$!4! * $)- mm inch -). 490 -!8 -). 490 -!8 ! " # $ % & ' ' ( ( , , , , , , - - 3 3 $ia -ultiwatt6ertical
tda7375av revision history doc id 6325 rev 4 19/20 6 revision history table 5. document revision history date revision changes 15-mar-2005 1 initial release. 24-jul-2008 2 removed the package multiwatt 15 horizontal. 05-dec-2008 3 document reformatted. updated section 5: package information . 13-feb-2012 4 updated table 1: device summary on page 1 .
tda7375av 20/20 doc id 6325 rev 4 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by two authorized st representatives, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2012 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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