TDA7261 25w mono amplifier with mute/st-by wide supply voltage range (up to 50v abs max.) split supply high output power: 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 ) few external components short circuit protection thermal overload protection description the TDA7261 is class ab audio power amplifier assembled in the multiwatt package, specially de- signed for high quality sound application in mono tv chassis. february 1997 multiwatt 8 ordering number: TDA7261 +5v 18k 15k in 1 m f 15k 1 m f mute/ st-by gnd 4.7 w 100nf out 1000 m f 1000 m f +v s 2 4 6 7 5 3 + - d94au088 rl +v s -v s m p figure 1: typical application circuit 1/9
absolute maximum ratings symbol parameter value unit v s dc supply voltage 50 v i o output peak current (internally limited) 4.5 a p tot power dissipation t case = 70 c30w t stg , t j storage and junction temperature -40 to +150 c 1 2 3 4 5 6 7 d94au090 8 n.c. gnd in -v s mute/st-by output +v s n.c. tab connected to pin 5 pin connection (top view) thermal data symbol description value unit r th j-case thermal resistance junction-case max 2.5 c/w TDA7261 2/9
electrical characteristics (refer to the test circuit, v s + 20v; r l = 8 w ; r s =50 w ; f = 1khz; t amb = 25 c, unless otherwise specified.) symbol parameter test condition min. typ. max. unit v s supply range +5 +22.5 v i q total quiescent current 30 ma p o music output power (*) thd = 10%; r l = 8 w ; v s + 28.5v; 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 0.02 % r l = 8 w ; p o = 0.1 to 15w; f = 100hz to 15khz 0.5 % r l = 4 w ; p o = 1w; f = 1khz 0.03 % r l = 4 w ; v s + 16v; p o = 0.1 to 12w; f = 100hz to 15khz 1% sr slew rate 10 v/ m s g v closed loop voltage gain 29 30 31 db d g v voltage gain matching 0.2 db e n total input noise a curve f = 20hz to 22khz 2.5 3.5 8 m v m v r i input resistance 15 20 k w svr supply voltage rejection fr = 100hz; vripple = 0.5v rms 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 90 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 1khz. TDA7261 3/9
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 # 4 shifted downward v pin # 4 shifted upward r3 18k w mute circuit v pin # 4 shifted upward v pin # 4 shifted downward r4 15k w mute circuit v pin # 4 shifted upward v pin # 4 shifted downward r5 4.7 w frequency stability danger of oscillations danger of oscillations c1 1 m f input dc decoupling higher low frequency cutoff c2 1 m f st-by/mute time constant larger on/off time smaller on/of time c3, c5 1000 m f supply voltage bypass danger of oscillations c4, c6 0.1 m f supply voltage bypass danger of oscillations c7 0.1 m f frequency stability dz 5.1v mute circuit q1 bc107 mute circuit applications suggestion (demo board schematic) the recommended values of the external compo- nents are those shown on the demo board sche- matic. different values can be used: the following table can help the designer. mute, stand-by truth table sw1 sw2 a a stand-by a b stand-by b b mute b a play TDA7261 4/9
r3 18k in c1 1 m f mute/ st-by gnd r5 4.7 w c7 100nf out c5 1000 m f c3 1000 m f +v s 2 4 6 7 5 3 + - d94au089a rl +v s -v s sw1 r1 dz q1 r4 15k r2 15k c2 1 m f sw2 c4 100nf c6 100nf st-by mute figure 2: demo board schematic figure 3: p.c. board and component layout of the demo board schematic (1:1 scale) TDA7261 5/9
figure 7: supply voltage rejection vs. fequency figure 6: distortion vs. output power figure 4: quiescent current vs. supply voltage figure 5: output power vs supply voltage figure 8: attenuation & total quiescent current vs. vpin4 voltage figure 9: power dissipation vs. output power TDA7261 6/9
mute stand-by function the pin 4 (mute/stand-by) controls the ampli- fier status by two different theresholds, referred to +v s . - when v pin4 higher than = +v s - 2.5v the amplifier is in stand-by mode and the final stage generators are off. - when v pin4 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 pin4 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) vpin4 (v) v s v s -2.5 v s- 6 v s -10 i q (ma) 0 vout (v) d94au084 figure 10 TDA7261 7/9
multiwatt8 package mechanical data dim. mm inch min. typ. max. min. typ. max. a 5 0.197 b 2.65 0.104 c 1.6 0.063 e 0.49 0.55 0.019 0.022 f 0.78 0.85 0.030 0.033 g 2.40 2.54 2.68 0.094 0.10 0.105 g1 17.64 17.78 17.92 0.69 0.70 0.71 h1 19.6 0.772 h2 20.2 0.795 l 20.35 20.65 0.80 0.81 l1 15.7 0.62 l2 17.05 17.20 17.35 0.67 0.68 0.68 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 s 1.9 2.6 0.075 0.102 s1 1.9 2.6 0.075 0.102 u 0.40 0.55 0.015 0.022 z 0.70 0.85 0.028 0.034 dia1 3.65 3.85 0.144 0.152 TDA7261 8/9
information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics 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 f rom its use. no license is granted by implication or otherwise under any patent or patent rights of sgs-thomson microelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously s upplied. sgs- thomson microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of sgs-thomson microelectronics. ? 1997 sgs-thomson microelectronics C printed in italy C all rights reserved sgs-thomson microelectronics group of companies australia - brazil - canada - china - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the n etherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. TDA7261 9/9
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