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TDA7265 25 +25w stereo amplifier with mute & st-by wide supply voltage range (up to 25v abs max.) split supply high output power 25 + 25w @ thd =10%, r l =8 w ,v s = +20v no pop at turn-on/off mute (pop free) stand-by feature (low i q ) short circuit protection thermal overload protection description the TDA7265 is class ab dual audio power am- plifier assembled in the multiwatt package, spe- cially designed for high quality sound application as hi-fi music centers and stereo tv sets. april 2002 ? multiwatt11 ordering number: TDA7265 +5v 18k 15k in (l) 1 m f 15k 1 m f mute/ st-by gnd in (r) 1 m f 4.7 w 4.7 w 100nf 100nf out (l) out (r) 1000 m f 1000 m f +v s 3 5 7 9 6 11 2 4 + + - - d94au085 rl (l) rl (r) -v s m p 560 w 18k in- (l) 8 10 in- (r) 1 560 w 18k figure 1: typical application circuit in split supply 1/11
absolute maximum ratings symbol parameter value unit v s dc supply voltage 25 v i o output peak current (internally limited) 4.5 a p tot power dissipation t case =70 c30w t op operating temperature -20 to 85 c t stg ,t j storage and junction temperature -40 to +150 c 1 2 3 4 5 6 7 9 10 11 8 in+(1) in-(1) gnd in-(2) in+(2) -v s mute output(2) +v s output(1) -v s tab connected to pin 6 d95au316 pin connection (top view) thermal data symbol description value unit r th j-case thermal resistance junction-case max 2 c/w play 5v r2 15k in (l) c3 1 m f r1 10k c1 1 m f mute in (r) c4 1 m f r8 4.7 w r7 1k c7 0.1 m f out (l) out (r) c5 1000 m f +v s 3 5 7 9 6 11 2 4 + + - - d96au444a out (l) out (r) gnd r4 30k in- (l) 8 10 in- (r) 1 r5 1k r6 30k r9 4.7 w c9 470 m f c10 470 m f c8 0.1 m f r3 15k 0 mute q1 bsx33 c6 0.1 m f d1 5.1v c2 100 m f fig 2: typical application circuit in single supply TDA7265 2/11
electrical characteristics (refer to the test circuit, v s = + 20v; r l =8 w ;r s =50 w ; g v = 30db; f = 1khz; t amb =25 c, unless otherwise specified.) symbol parameter test condition min. typ. max. unit v s supply range +5 +25 v i q total quiescent current 80 130 ma v os input offset voltage 20 +20 mv i b non inverting input bias current 500 na p o music output power (*) thd = 10%; r l =8 w ; v s = + 22.5v 32 w p o output power thd = 10% r l =8 w ; v s + 16v; r l =4 w 20 25 25 w w thd = 1% r l =8 w ; v s + 16v; r l =4 w 20 20 w w thd total harmonic distortion r l =8 w ;p o = 1w; f = 1khz 0.01 % r l =8 w ; p o = 0.1 to 15w; f = 100hz to 15khz 0.7 % r l =4 w ;p o = 1w; f = 1khz 0.02 % r l =4 w ;v s + 16v; p o = 0.1 to 12w; f = 100hz to 15khz 1% c t cross talk f = 1khz f = 10khz 70 60 db db sr slew rate 10 v/ m s g ol open loop voltage gain 80 db e n total input noise a curve f = 20hz to 22khz 3 48 m v m v r i input resistance 15 20 k w svr supply voltage rejection (each channel) fr = 100hz vr = 0.5v 60 db t j thermal shut-down junction temperature 145 c mute function [ref: +v s ] vt mute mute / play threshold -7 -6 -5 v a m mute attenuation 60 70 db stand-by function [ref: +v s ] vt st-by stand-by / mute threshold -3.5 -2.5 -1.5 v a st-by stand-by attenuation 110 db i q st-by quiescent current @ stand-by 3 ma note : (*) full power up to. v s = 22.5v with r l =8 w and v s = 16v with r l =4 w music power is the maximal power which the amplifier is capable of producing across the rated load resistance (regardless of non linearity) 1 sec after the application of a sinusoidal input signal of frequency 1k hz. TDA7265 3/11
figure 3: quiescent current vs. supply voltage figure 4: frequency response figure 5: output power vs. supply voltage figure 6: t.h.d. vs. output power figure 7: output power vs. supply voltage figure 8: t.h.d. vs. output power TDA7265 4/11
figure 9: quiescent current vs. pin # 5 voltage figure 10: attenuation vs. pin # 5 voltage figure 11: svr vs. frequency figure 12: crosstalk vs. frequency figure 13: power dissipaton vs. output power figure 14: power dissipaton vs. output power TDA7265 5/11
mute stand-by function the pin 5 (mute/stand-by) controls the ampli- fier status by two different thresholds, referred to +v s . - when v pin5 higher than = +v s - 2.5v the amplifier is in stand-by mode and the final stage generators are off - when v pin5 is between +v s - 2.5v and +v s - 6v the final stage current generators are switched on and the amplifier is in mute mode - when v pin5 is lower than +v s - 6v the am- plifier is play mode. t off stdby mute mute mute mute play stdby play off stdby 20 +v s (v) -20 -v s v in (mv) vpin5 (v) v s v s -2.5 v s- 6 v s -10 i q (ma) 0 vout (v) d94au086 figure 15 TDA7265 6/11
r3 in (l) c1 r2 c3 mute/ st-by gnd in (r) c2 r7 r10 c8 c9 out (l) out (r) c6 c4 +v s 3 5 7 9 6 11 2 4 + + - - d94au087b rl (l) rl (r) +v s -v s r9 r5 in- (l) 8 10 in- (r) 1 sw1 r1 dz r4 sw2 c7 r8 r6 c5 q1 st-by mute figure 16: test and application circuit (stereo configuration) figure 17: pc board and components layout of the figure 15 (1:1 scale) TDA7265 7/11
components recommended value purpose larger than recommended value smaller than recommended value r1 10k w mute circuit increase of dz biasing current r2 15k w mute circuit v pin # 5 shifted downward v pin # 5 shifted upward r3 18k w mute circuit v pin # 5 shifted upward v pin # 5 shifted downward r4 15k w mute circuit v pin # 5 shifted upward v pin # 5 shifted downward r5, r8 18k w closed loop gain setting (*) increase of gain r6, r9 560 w decrease of gain r7, r10 4.7 w frequency stability danger of oscillations danger of oscillations c1, c2 1 m f input dc decoupling higher low frequency cutoff c3 1 m f st-by/mute time constant larger on/off time smaller on/off time c4, c6 1000 m f supply voltage bypass danger of oscillations c5, c7 0.1 m f supply voltage bypass danger of oscillations c8, c9 0.1 m f frequency stability dz 5.1v mute circuit q1 bc107 mute circuit (*) closed loop gain has to be => 25db applications suggestion (demo board schematic) the recommended values of the external compo- nents are those shown are the demo board sche- matic different values can be used: the following table can help the designer. mute, stand-by truth table sw1 sw2 b a stand-by b b stand-by a a mute a b play TDA7265 8/11
bridge application another application suggestion concerns the bridge configuration, where the two power am- plifiers are connected as shown by the schematic diagram of figure. 18. this application shows, however, some operative limits due to dissipation and current capability of the output stage. for this reason, we reccomend to use the TDA7265 in bridge with the supply volt- age equal/lower than 16v when the load is 8 w ; with higher loads (i.e.16 w ), the amplifier can work correctly in the whole supply voltage range. the detected characteristics of t.h.d. vs pout and frequency response are shown in fig.19 and fig.20. with r1=8 w , vs=+/-16v the maximum output power obtainable is 50w at t.d.h.=10%. the quiescent current remains unchanged with respect to the stereo configuration (~80ma as typical at vs=+/-16v). the last point to take into consideration concerns the short-circuit protection. as for the stereo appli- cation, the TDA7265 is fully protected against any kind of short-circuit ( between out/gnd, out/+vs and out/-vs). figure 19: distortion vs. output power figure 20: frequency response of the bridge ap- plications 1 m f st-by/ mute 1 m f r5 4.7 w r6 4.7 w c7 0.1 m f c9 0.1 m f c5 0.1 m f c4 1000 m f +v s 3 5 7 9 6 11 2 4 + + - - d94au190 rl r2 560 w r1 36k w 8 10 1 r4 560 w r3 36k w c1 in c2 c3 0.1 m f c6 1000 m f -v s c8 5.6nf figure 18: bridge application circuit TDA7265 9/11
multiwatt11 v dim. mm inch min. typ. max. min. typ. max. a 5 0.197 b 2.65 0.104 c 1.6 0.063 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 outline and mechanical data TDA7265 10/11
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 ? 2002 stmicroelectronics printed in italy all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india -israel - italy - japan - malaysia - malta - morocco singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com TDA7265 11/11

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