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january 2010 doc id 1451 rev 4 1/25 1 tda2005 20 w bridge/stereo amplifier for car radio features high output power: ?p o = 10 + 10 w @ r l = 2 , thd = 10 % ?p o = 20 w @ r l = 4 , thd = 10 %. protection against: ? output dc and ac short circuit to ground ? overrating chip temperature ? load dump voltage surge ? fortuitous open ground ? very inductive loads loudspeaker protection during short circuit for one wire to ground description the tda2005 is a class b dual audio power amplifier in multiwatt1 1 package specifically designed for car radio applications. power booster amplifiers can be easily designed using this device that provides a high current capability (up to 3.5 a) and can drive very low impedance loads (down to 1.6 in stereo applications) obtaining an output power of more than 20 w (bridge configuration). multiwatt11 table 1. device summary order code package packing TDA2005R multiwatt11 tube tda2005m (1) 1. do not use for new design. multiwatt11 tube tda2005s (1) multiwatt11 tube www.st.com
contents tda2005 2/25 doc id 1451 rev 4 contents 1 schematic and pins connection di agrams . . . . . . . . . . . . . . . . . . . . . . . 5 2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 bridge amplifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3.1 electrical characteristics (bridge application) . . . . . . . . . . . . . . . . . . . . . . 7 2.3.2 bridge amplifier design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 stereo amplifier application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.4.1 electrical characteristics (stereo application) . . . . . . . . . . . . . . . . . . . . . 11 3 application suggestion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.1 built-in protection systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.1.1 load dump voltage surge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.1.2 short circuit (ac and dc conditions) . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.1.3 polarity inversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.1.4 open ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.1.5 inductive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.1.6 dc voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.1.7 thermal shut-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.1.8 loudspeaker protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
tda2005 list of tables doc id 1451 rev 4 3/25 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 3. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 4. electrical characteristics (bridge application) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 5. bridge amplifier design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 6. high gain vs. rx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 7. electrical characteristics (stereo application) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 table 8. recommended values of the component of the bridge application circuit . . . . . . . . . . . . . 15 table 9. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
list of figures tda2005 4/25 doc id 1451 rev 4 list of figures figure 1. schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. pins connection diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 3. test and application circuit (bridge amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 4. pc board and components layout of figure 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 5. output offset voltage vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 6. distortion vs. output power (r l = 4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 7. distortion vs. output power (r l = 3.2 ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 8. bridge configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 9. typical stereo application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 10. quiescent output voltage vs. supply voltage (stereo amplifier). . . . . . . . . . . . . . . . . . . . . . 12 figure 11. quiescent drain current vs. supply voltage (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . 12 figure 12. distortion vs. output power (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 figure 13. output power vs. supply voltage, r l = 2 and 4 (stereo amplifier). . . . . . . . . . . . . . . . . . 12 figure 14. output power vs. supply voltage, r l = 1.6 and 3.2 (stereo amplifier) . . . . . . . . . . . . . . . 13 figure 15. distortion vs. frequency, r l = 2 and 4 (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 16. distortion vs. frequency, r l = 1.6 and 3.2 (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . 13 figure 17. supply voltage rejection vs. c3 (stereo amplifier). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 18. supply voltage rejection vs. frequency (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 19. supply voltage re jection vs. c2 and c3, g v = 390/1 (stereo amplifier) . . . . . . . . . . . . . . 13 figure 20. supply voltage re jection vs. c2 and c3, g v = 1000/10 (stereo amplifier) . . . . . . . . . . . . 14 figure 21. gain vs. input sensitivity r l = 4 (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 22. gain vs. input sensitivity r l = 2 (stereo amplifier) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 23. total power dissipation and efficiency vs. output power (bridge) . . . . . . . . . . . . . . . . . . . . 14 figure 24. total power dissipation and efficiency vs. output power (stereo) . . . . . . . . . . . . . . . . . . . . 14 figure 25. bridge amplifier without boostrap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 26. pc board and components layout of figure 25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 27. low cost bridge amplifier (gv = 42db) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 28. pc board and components layout of figure 27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 29. 10 + 10 w stereo amplifier with tone balance and loudness control. . . . . . . . . . . . . . . . . . 18 figure 30. tone control response (circuit of figure 29 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 figure 31. 20 w bus amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 32. simple 20 w two way amplifier (fc = 2 khz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 33. bridge amplifier circuit suited for low-gain applications (gv = 34 db) . . . . . . . . . . . . . . . . 20 figure 34. example of muting circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 35. suggested lc network circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 36. voltage gain bridge configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 37. maximum allowable power dissipation vs. ambient temperature . . . . . . . . . . . . . . . . . . . . 22 figure 38. output power and drain current vs. case temperature (r l = 4 ) . . . . . . . . . . . . . . . . . . . 22 figure 39. output power and drain current vs. case temperature (r l = 3.2 ) . . . . . . . . . . . . . . . . . . 22 figure 40. multiwatt11 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
tda2005 schematic and pins connection diagrams doc id 1451 rev 4 5/25 1 schematic and pins connection diagrams figure 1. schematic diagram figure 2. pins connection diagram (top view) 1 2 3 4 5 6 7 9 10 11 8 bootstrap(1) input-(1) svrr gnd input-(2) input+(2) output(2) +v s output(1) input+(1) tab connected to pin 6 d95au318 bootstrap(2)
electrical specifications tda2005 6/25 doc id 1451 rev 4 2 electrical specifications 2.1 absolute maximum ratings 2.2 thermal data 2.3 bridge amplifier section figure 3. test and application circuit (bridge amplifier) table 2. absolute maximum ratings symbol parameter value unit v s peak supply voltage (50 ms) 40 v dc supply voltage 28 operating supply voltage 18 io (1) 1. the max. output current is internally limited. output peak current (non repetitive t = 0.1 ms) 4.5 a output peak current (repetitive f 10 hz) 3.5 p tot power dissipation at t case = 60 c 20 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 junction-to-case max 3 c/w
tda2005 electrical specifications doc id 1451 rev 4 7/25 figure 4. pc board and components layout of figure 3 2.3.1 electrical characteri stics (bridge application) refer to the bridge application circuit t amb = 25c; gv = 50db; r th(heatsink) = 4c/w unless otherwise specified. table 4. electrical characteristics (bridge application) symbol parameter test condition min. typ. max. unit v s supply voltage - 8 - 18 v v os output offset voltage (between pin 8 and pin 10) v s = 14.4 v v s = 13.2 v -- 150 150 mv mv i d total quiescent drain current v s = 14.4 v; r l = 4 v s = 13.2 v; r l = 3.2 - 75 70 150 150 ma ma p o output power f = 1 khz, thd = 10 % v s = 14.4 v; r l = 4 v s = 14.4 v; r l = 3.2 v s = 13.2 v; r l = 3.2 18 20 17 20 22 19 -w thd total harmonic distortion f = 1 khz; v s = 14.4 v; r l = 4 ; p o = 50 mw to 15 w; --1% f = 1 khz; v s = 13.2 v; r l = 3.2 ; p o = 50m w to 13 w; --1% v i input sensitivity f = 1 khz r l = 4 ; p o = 2 w; r l = 3.2 ; p o = 2 w -9 8 -mw r i input resistance f = 1 khz 70 - - k f l low frequency roll off (-3 db) r l = 3.2 --40hz f h high frequency roll off (-3 db) r l = 3.2 20 - - khz gv closed loop voltage gain f = 1 khz - 50 - db e n total input noise voltage r g = 10 (1) -310 v svr supply voltage rejection v ripple = 0.5 v; f ripple =100 hz r g = 10 k ; c 4 = 10 f 45 55 - db
electrical specifications tda2005 8/25 doc id 1451 rev 4 efficiency f = 1 khz; v s = 14.4 v; r l = 4 ; p o = 20 w; r l = 3.2 ; p o = 22 w -60 60 - % f = 1 khz; v s = 13.2 v; r l = 3.2 ; p o = 19 w -58- svr supply voltage rejection f = 100 hz; v ripple = 0.5 v; r g = 10 k ; r l = 4 30 36 - db t j thermal shut-down junction temperature f = 1 khz; v s = 14.4v; r l = 4 ; p tot = 13 w - 145 - c v osh output voltage with one side of the speaker shorted to ground v s = 14.4 v; r l = 4 v s = 13.2 v; r l = 3.2 --2v 1. bandwidth filter: 22 hz to 22 khz. figure 5. output offset voltage vs. supply voltage figure 6. distortion vs. output power (r l = 4 ) figure 7. distortion vs. output power (r l = 3.2 ) table 4. electrical characteristics (bridge application) (continued) symbol parameter test condition min. typ. max. unit v os (mv) v s (v) 100 80 60 40 20 0 8 10 12 14 16 v s = 14.4 v g v = 50 db r l = 4 f = 1 khz d (%) 1 110 0.1 10 p o (w) v s = 13.2 v g v = 50 db r l = 3.2 f = 1 khz d (%) 1 110 0.1 10 p o (w)
tda2005 electrical specifications doc id 1451 rev 4 9/25 2.3.2 bridge amplifier design the following considerations can be useful when designing a bridge amplifier. where: v ce sat = output transistors saturation voltage v s = allowable supply voltage r l = load impedance voltage and current swings are twice for a bridge amplifier in comparison with single ended amplifier. in order words, with the same r l the bridge configuration can deliver an output power that is four times the output power of a single ended amplifier, while, with the same max output current the bridge configuration can deliver an output power that is four times the output power of a single ended amplifier, while, with the same max output current the bridge configuration can deliver an output power that is twice the output power of a single ended amplifier. core must be take n when selecting v s and r l in order to avoid an output peak current above the absolute maximum rating. from the expression for i omax , assuming v s = 14.4v and v ce sat = 2v, the minimum load that can be driven by tda2005 in bridge configuration is: the voltage gain of the bridge configuration is given by (see figure 36 ): table 5. bridge amplifier design parameter single ended bridge v o max peak output voltage (before clipping) i o max peak output current (before clipping) p o max rms output power (before clipping) 1 2 -- - v s 2v cesat ? () v s 2v cesat ? 1 2 -- - v s 2v cesat ? r l ----------------------------------- v s 2v cesat ? r l ----------------------------------- 1 4 -- - v s 2v cesat ? () 2 2r l ------------------------------------------- v s 2v cesat ? () 2 2r l ------------------------------------------- r lmin v s 2v cesat ? i omax ----------------------------------- - 14.4 4 ? 3.5 -------------------- - 2.97 === g v v 0 v 1 ------ - 1 r 1 r 2 r 4 ? r 2 r 4 + -------------------- - ?? ?? ?? -------------------------- r 3 r 4 ------ - ++ ==
electrical specifications tda2005 10/25 doc id 1451 rev 4 for sufficiently high gains (40 to 50 db) it is possible to put r 2 = r 4 and r 3 = 2r 1 , simplifying the formula in: figure 8. bridge configuration 2.4 stereo amplifier application figure 9. typical stereo application circuit table 6. high gain vs. rx g v (db) r 1 ( )r 2 = r 4 ( )r 3 ( ) 40 1000 39 2000 50 1000 12 2000 g v 4 r 1 r 2 ------ - =
tda2005 electrical specifications doc id 1451 rev 4 11/25 2.4.1 electrical characteri stics (stereo application) refer to the stereo application circuit t amb = 25 c; g v = 50 db; r th(heatsink) = 4c/w unless otherwise specified table 7. electrical characteristics (stereo application) symbol parameter test condition min. typ. max. unit v s supply voltage 8 18 v v o quiescent offset voltage v s = 14.4 v v s = 13.2 v 6.6 6 7.2 6.6 7.8 7.2 v v i d total quiescent drain current v s = 14.4 v v s = 13.2 v - 65 62 120 120 ma ma p o output power (each channel) f = 1 khz; thd = 10 % v s = 14.4 v; r l = 4 v s = 14.4 v; r l = 3.2 v s = 14.4 v; r l = 2 v s = 14.4 v; r l = 1.6 6 7 9 10 6.5 8 10 11 -w f = 1 khz; thd = 10 % v s = 13.2 v; r l =3.2 v s = 13.2 v; r l = 1.6 v s = 16 v; r l = 2 6 9 6.5 10 12 -w thd total harmonic distortion f = 1 khz; v s = 14.4 v; r l = 4 ; p o = 50 mw to 4 w; - 0.2 1% f = 1 khz; v s = 14.4 v; r l = 2 ; p o = 50 mw to 6 w; - 0.3 1% f = 1 khz; v s = 13.2 v; r l = 3.2 ; p o = 50 mw to 3w; - 0.2 1% f = 1khz; v s = 13.2v; r l = 1.6 ; p o = 40mw to 6w; - 0.3 1% ct cross talk v s = 14.4 v; v o = 4 v rms ; r g = 5 k ; r l = 4 ; f = 1 khz f = 10 khz - 60 45 - mw mw v i input saturation voltage - 300 - mw v i input sensitivity f = 1 khz; po = 1w; r l = 4 ; r l = 3.2 ; -6 5.5 -mv mv r i input resistance f = 1 khz 70 200 - k f l low frequency roll off (-3 db) r l = 2 --50hz f h high frequency roll off (-3 db) r l = 2 15 - - khz g v open loop voltage gain f = 1 khz - 90 - db closed loop voltage gain f = 1 khz 48 50 51
electrical specifications tda2005 12/25 doc id 1451 rev 4 gv closed loop gain matching - - 0.5 - db e n total input noise voltage r g = 10 k (1) -1.55 v svr supply voltage rejection v ripple = 0.5 v; f ripple =100 hz r g = 10 k ; c 3 = 10 f; 35 45 - db efficiency f = 1 khz; v s = 14.4 v; r l = 4 ; p o = 6.5 w; r l = 2 ; p o = 10 w; -70 60 -% f = 1 khz; v s = 13.2 v; r l = 3.2 ; p o = 6.5 w; r l = 1.6 ; p o = 100 w; -70 60 -% 1. bandwidth filter: 22 hz to 22 khz. figure 10. quiescent output voltage vs. sup- ply voltage (stereo amplifier) figure 11. quiescent drain current vs. supply voltage (stereo amplifier) figure 12. distortion vs. output power (stereo amplifier) figure 13. output power vs. supply voltage, r l = 2 and 4 (stereo amplifier) table 7. electrical characteristics (stereo application) (continued) symbol parameter test condition min. typ. max. unit v o (v) 8 5 6 7 4 10 12 14 16 v s (v) 08 i d (ma) 100 80 60 40 20 10 12 14 16 v s (v) 08 d (%) 2 4 6 8 0 0.01 0.1 1 p o (w) f = 1 khz g v = 50 db v s = 13.2 v r l = 1.6 v s = 14.4 v r l = 2 v s = 13.2 v r l = 3.2 v s = 14.4 v r l = 4 v s (v) p o (w) 15 12 9 6 3 0 8 10 12 14 16 f = 1 khz g v = 50 db d = 10 % r l = 2 r l = 4
tda2005 electrical specifications doc id 1451 rev 4 13/25 figure 14. output power vs. supply voltage, r l = 1.6 and 3.2 (stereo amplifier) figure 15. distortion vs. frequency, r l = 2 and 4 (stereo amplifier) figure 16. distortion vs. frequency, r l = 1.6 and 3.2 (stereo amplifier) figure 17. supply voltage rejection vs. c3 (stereo amplifier) figure 18. supply voltage rejection vs. frequency (stereo amplifier) figure 19. supply voltage rejection vs. c2 and c3, g v = 390/1 (stereo amplifier) v s (v) p o (w) 15 12 9 6 3 0 8 10 12 14 16 f = 1 khz g v = 50 db d = 10 % r l = 1.6 r l = 3.2 d (%) 1.2 0.8 0.4 10 f (hz) 10 2 10 3 10 4 v s = 14.4 v g v = 50 db p o = 2.5 w r l = 2 p o = 2.5 w r l = 4 d (%) 1.2 0.8 0.4 10 f (hz) 10 2 10 3 10 4 v s = 13.2 v g v = 50 db p o = 2.5 w r l = 1.6 p o = 2.5 w r l = 3.2 svr (db) 10 20 50 60 40 30 10 12 c 3 (f) 13 v s = 14.4 v f ripple = 100 khz v ripple = 0.5 v g v = 50 db r l = 3.2 svr (db) 20 40 30 50 60 10 10 2 10 3 f (hz) r g = 0 r g = 10 k v s = 14.4 v g v = 50 db c 3 = 10 f svr (db) 50 40 30 20 10 20 c 3 (f) 12 5 v s = 14.4 v r l = 4 r g = 10 k g v = 390/1 f ripple = 100 hz c 2 = 220 f c 2 = 22 f c 2 = 5 f
electrical specifications tda2005 14/25 doc id 1451 rev 4 figure 20. supply voltage rejection vs. c2 and c3, g v = 1000/10 (stereo amplifier) figure 21. gain vs. input sensitivity r l = 4 (stereo amplifier) figure 22. gain vs. input sensitivity r l = 2 (stereo amplifier) figure 23. total power dissipation and efficiency vs. output power (bridge) figure 24. total power dissipation and efficiency vs. output power (stereo) svr (db) 50 40 30 20 10 20 c 3 (f) 12 5 v s = 14.4 v r l = 4 r g = 10 k g v = 1000/10 f ripple = 100 hz c 2 = 220 f c 2 = 22 f c 2 = 5 f g v (db) 54 50 46 42 38 34 30 20 50 26 22 10 100 100 200 500 300 v i (mv) v s = 14.4 v f = 1 khz r l = 4 p o = 6 w p o = 0.5 w 30 g v 2468 2468 g v (db) 54 50 46 42 38 34 30 20 50 26 22 10 100 100 200 500 300 v i (mv) v s = 14.4 v f = 1 khz r l = 2 p o = 10 w p o = 0.5 w 30 g v 2468 2 468 p tot (w) 10 60 40 20 12 (%) 2 4 6 8 20 24 p o (w) 8 41216 v s = 14.4 v r l = 4 f = 1 khz g v = 50 db p tot p tot (w) 60 40 20 6 (%) 2 4 10 12 p o (w) 4 268 v s = 13.2 v r l = 3.2 f = 1 khz g v = 50 db p tot
tda2005 application suggestion doc id 1451 rev 4 15/25 3 application suggestion the recommended values of the components are those shown on bridge application circuit of figure 3 . different values can be used; the following table can help the designer. table 8. recommended values of the component of the bridge application circuit component recommended value purpose larger than smaller than r c1 2.2 f input dc decoupling - - c2 2.2 f optimization of turn on pop and turn on delay high turn on delay high turn on pop, higher low frequency cutoff increase of noise c3 0.1 f supply bypass - danger of oscillation c4 10 f ripple rejection increase of svr, increase of the switch- on time degradation of svr c5, c7 100 f bootstrapping - increase of distortion at low frequency c6, c8 220 f feedback input dc decoupling, low frequency cut-off - danger of oscillation at high frequencies with inductive loads c9, c10 0.1 f frequency stability - danger of oscillation r1 120 k optimization of the output symmetry smaller p omax smaller p omax r2 1 k --- r3 2 k --- r4, r5 12 closed loop gain setting (see bridge amplifier design (1) ) -- r6, r7 1 frequency stability danger of oscillation at high frequencies with inductive loads - 1. the closed loop gain must be higher than 32 db.
application information tda2005 16/25 doc id 1451 rev 4 4 application information figure 25. bridge amplifier without boostrap figure 26. pc board and components layout of figure 25
tda2005 application information doc id 1451 rev 4 17/25 figure 27. low cost bridge amplifier (g v = 42db) figure 28. pc board and components layout of figure 27
application information tda2005 18/25 doc id 1451 rev 4 figure 29. 10 + 10 w stereo amplifier with tone balance and loudness control figure 30. tone control response (circuit of figure 29 ) (db) +6 +3 -3 -9 -12 10 f (hz) 10 2 10 3 10 4 -6 0 mid bass treble
tda2005 application information doc id 1451 rev 4 19/25 figure 31. 20 w bus amplifier figure 32. simple 20 w two way amplifier (f c = 2 khz)
application information tda2005 20/25 doc id 1451 rev 4 figure 33. bridge amplifier circuit suited for low-gain applications (g v = 34 db) figure 34. example of muting circuit 4.1 built-in protection systems 4.1.1 load dump voltage surge the tda2005 has a circuit which enables it to withstand voltage pulse train, on pin 9, of the type shown in figure 36 . if the supply voltage peaks to more than 40 v, then an lc filter must be inserted between the supply and pin 9, in order to assure that the pulses at pin 9 will be held within the limits shown. a suggested lc network is shown in figure 35 . with this network, a train of pulses with amplitude up to 120 v and width of 2 ms can be applied at point a. this type of protection is on when the supply voltage (pulse or dc) exceeds 18 v. for this reason the maximum operating supply voltage is 18 v.
tda2005 application information doc id 1451 rev 4 21/25 figure 35. suggested lc network circuit figure 36. voltage gain bridge configuration 4.1.2 short circuit (ac and dc conditions) the tda2005 can withstand a permanent short-circuit on the output for a supply voltage up to 16 v. 4.1.3 polarity inversion high current (up to 10 a) can be handled by the device with no damage for a longer period than the blow-out time of a quick 2 a fuse (normally connected in series with the supply). this feature is added to avoid destruction, if during fitting to the car, a mistake on the connection of the supply is made. 4.1.4 open ground when the ratio is in the on condition and the ground is accidentally opened, a standard audio amplifier will be damaged. on the tda20 05 protection diodes ar e included to avoid any damage. 4.1.5 inductive load a protection diode is provided to allow use of the tda2005 with inductive loads. 4.1.6 dc voltage the maximum operating dc voltage for the tda2005 is 18 v. however the device can withstand a dc voltage up to 28 v with no damage. this could occur during winter if two batteries are series connected to crank the engine.
application information tda2005 22/25 doc id 1451 rev 4 4.1.7 thermal shut-down the presence of a thermal limiting circuit offers the following advantages: 1. an overload on the output (even if it is permanent), or an excessive ambient temperature can be easily withstood. 2. the heatsink can have a smaller factor of safety compared with that of a conventional circuit. there is no device damage in the case of excessive junction temperature : all that happens is that p o (and therefore p tot ) and id are reduced. the maximum allowable power dissipation depends upon the size of the external heatsink (i.e. its thermal resistance); figure 37 shows the power dissipation as a function of ambient temperature for different thermal resistance. 4.1.8 loudspeaker protection the circuit offers loudspeaker protection during short circuit for one wire to ground. figure 37. maximum allowable power dissipa- tion vs. ambient temperature figure 38. output power and drain current vs. case temperature (r l = 4 ) figure 39. output power and drain current vs. case temperature (r l = 3.2 ) p tot (w) 32 28 24 20 -50 50 100 t amb (?c) 0 16 12 8 4 0 r th = 8?c/w r th = 4?c/w r th = 2?c/w infinite heatsink p o (w) t case (?c) 16 12 8 4 1.2 0.9 0.6 0.3 0 40 80 120 160 i d (a) i d p o v s = 14.4v r l = 4 f = 1 khz p o (w) t case (?c) 8 6 4 2 1.2 0.9 0.6 0.3 0 40 80 120 160 i d (a) i d p o v s = 13.2v r l = 3.2 f = 1 khz
tda2005 package information doc id 1451 rev 4 23/25 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 40. multiwatt11 mechanical data and package dimensions outline and mechanical data 0016035 h dim. mm inch min. typ. max. min. typ. max. a50.197 b 2.65 0.104 c1.60.063 d 1 0.039 e 0.49 0.55 0.019 0.022 f 0.88 0.95 0.035 0.037 g 1.45 1.7 1.95 0.057 0.067 0.077 g1 16.75 17 17.25 0.659 0.669 0.679 h1 19.6 0.772 h2 20.2 0.795 l 21.9 22.2 22.5 0.862 0.874 0.886 l1 21.7 22.1 22.5 0.854 0.87 0.886 l2 17.4 18.1 0.685 0.713 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 0.114 m 4.25 4.55 4.85 0.167 0.179 0.191 m1 4.73 5.08 5.43 0.186 0.200 0.214 s 1.9 2.6 0.075 0.102 s1 1.9 2.6 0.075 0.102 dia1 3.65 3.85 0.144 0.152 multiwatt11 (vertical)
revision history tda2005 24/25 doc id 1451 rev 4 6 revision history table 9. document revision history date revision changes 09-jun-1998 1 initial release. 20-may-2000 2 update logo. 10-sep-2003 3 update package drawing. 28-jan-2010 4 document reformatted. updated features , description and table 1: device summary in cover page.
tda2005 doc id 1451 rev 4 25/25 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 an authorized st representative, 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. ? 2010 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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