TDA7241B 20w bridge amplifier for car radio very low stand-by current gain = 32db output protected against short circuits to ground and across load compact heptawatt package dump transient thermal shutdown loudspeaker protection high current capability low distortion / low noise description the TDA7241B is a 20w bridge audio amplifier ic designed specially for car radio applications. thanks to the low external part count and com- pact heptawatt 7-pin power package the TDA7241B occupies little space on the printed circuit board. reliable operation is guaranteed by a compre- hensive array of on-chip protection features. these include protection against ac and dc out- put short circuits (to ground and across the load), load dump transients, and junction overtempera- ture. additionally, the TDA7241B protects the loudspeaker when one output is short-circuited to ground. july 1997 heptawatt ordering number: TDA7241Bh figure 1: test and appliication circuit 1/7
absolute maximum ratings symbol parameter value unit v s operating supply voltage 18 v v s dc supply voltage 28 v v s peak supply voltage (t = 50ms) 40 v i o peak output current (non repetitive t = 0.1ms) 4.5 a i o peak output current (repetitive f > 10hz) 3.5 a p tot power dissipation at t case = 85 c16w t stg , t j storage and junction temperature -40 to 150 c thermal data symbol description value unit r th j-case thermal resistance junction-case max 4 c/w pin connection (top view) TDA7241B 2/7
electrical characteristics (refer to the circuit of fig. 1; v s = 14.4v; r th (heatsink) = 4 c/w, t amb = 25c, unless otherwise specified symbol parameter test condition min. typ. max. unit v s supply range 18 v i d total quiescent current r l = 4 w 80 ma v os output offset voltage 100 mv p o output power . r l = 2 w f = 1khz d = 10% r l = 4 w . r l = 8 w 18 26 20 12 w d distortion r l = 4 w f = 1khz p o = 50mw to 12w 0.1 0.5 % r l = 8 w f = 1khz p o = 50mw to 6w 0.05 % g v voltage gain f = 1khz 31 32 33 db svr supply voltage rejection f =100hz r g = 10k w 40 50 db e n total input noise b = curve a r g = 10k w 2 m v b = 22hz to 22khz r s = 10k w 310mv h efficiency r l = 4 w f = 1khz p o = 20w 65 % i sb stand-by current 100 m a r i input resistance f = 1khz 70 k w v i input sensitivity f = 1khz p o = 2w r l = 4 w 70 mv f l low frequency roll off (-3db) p o = 15w r l = 4 w 30 hz f h high frequency roll off (-3db) po = 15w r l = 4 w 25 khz a s stand-by attenuation v o = 2vrms 70 90 db v th (pin.2) stand-by threshold 1 v t sd thermal shutdown junction temp. 150 c (*) b = curve (**) b = 22hz to 22khz figure 2: p.c. board and component layout of the circuit of fig. 1 (1:1 scale). TDA7241B 3/7
figure 3: output power vs. supply voltage figure 4: output power vs. supply voltage figure 5: distortion vs. output power figure 6: distortion vs. output power figure 7: distortion vs. output power figure 8: svr vs. frequency r g = 10k w r g = 0 w TDA7241B 4/7
figure 9: power dissipation and efficiency vs. output power figure 10: power dissipation and efficiency vs. output power TDA7241B 5/7
heptawatt package mechanical data dim. mm inch min. typ. max. min. typ. max. a 4.8 0.189 c 1.37 0.054 d 2.4 2.8 0.094 0.110 d1 1.2 1.35 0.047 0.053 e 0.35 0.55 0.014 0.022 f 0.6 0.8 0.024 0.031 f1 0.9 0.035 g 2.41 2.54 2.67 0.095 0.100 0.105 g1 4.91 5.08 5.21 0.193 0.200 0.205 g2 7.49 7.62 7.8 0.295 0.300 0.307 h2 10.4 0.409 h3 10.05 10.4 0.396 0.409 l 16.97 0.668 l1 14.92 0.587 l2 21.54 0.848 l3 22.62 0.891 l5 2.6 3 0.102 0.118 l6 15.1 15.8 0.594 0.622 l7 6 6.6 0.236 0.260 m 2.8 0.110 m1 5.08 0.200 dia 3.65 3.85 0.144 0.152 TDA7241B 6/7
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 s men- tioned in this publication are subject to change without notice. this publication supersedes and replaces all information previ ously supplied. sgs-thomson microelectronics products are not authorized for use as critical components in life support devices or systems with out ex- press written approval of sgs-thomson microelectronics. ? 1997 sgs-thomson microelectronics - all rights reserved heptawatt ? is a trademark of sgs-thomson microelectronics 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. TDA7241B 7/7
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