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TDA2052 60w hi-fi audio power amplifier with mute / stand-by supply voltage range up to 25v split supply operation high output power (up to 60w music power) low distortion mute/stand-by function no switch on/off noise ac short circuit protection thermal shutdown esd protection description the TDA2052 is a monolithic integrated circuit in heptawatt package, intended for use as audio class ab amplifier in tv or hi-fi field application. thanks to the wide voltage range and to the high out current capability it's able to supply the high- est power into both 4 w and 8 w loads even in presence of poor supply regulation. the built in muting/stand-by function simplifies the remote operations avoiding also switching on- off noises. this is advanced information on a new product now in development or undergoing evaluation. details are subject to change without notice. february 1997 heptawatt ordering number: TDA2052 test and application circuit 1/13
absolute maximum ratings symbol parameter value unit v s dc supply voltage 25 v i o output peak current (internally limited) 6 a p tot power dissipation t case =70 c30w t op operating temperature range 0 to +70 c t stg ,t j storage and junction temperature -40 to +150 c block diagram 1 2 3 4 5 6 7 non inverting input(play) inverting input -v s stand-by/mute +v s output d95au326 tab connected to pin 4 non inverting input(mute) pin connection (top view) TDA2052 2/13
electrical characteristics (refer to the test circuit, g v = 32db; v s + 18v; f = 1khz; t amb = 25 c, unless otherwise specified.) symbol parameter test condition min. typ. max. unit v s supply range +6 +25 v i q total quiescent current v s = +22v 20 40 70 ma i b input bias current +0.5 m a v os input offset voltage +15 mv i os input offset current +200 na p o music output power iec268-3 rules (*) v s = + 22.5, r l =4 w , d = 10%, t = 1s 50 60 w p o output power (continuous rms) d = 10% rl = 4 w r l =8 w v s = +22v, r l =8 w 35 30 40 22 33 w w w d=1% r l =4 w r l =8 w v s = +22v, r l =8 w 32 17 28 w w w d total harmonic distortion r l =4 w p o = 0.1 to 20w; f = 100hz to 15khz v s + 22v, r l =8 w p o = 0.1 to 20w; f = 100hz to 15khz 0.1 0.1 0.7 0.5 % % sr slew rate 3 5 v/ m s g v open loop voltage gain 80 db e n total input noise a curve f = 20hz to 20khz 2 310 m v m v r i input resistance 500 k w svr supply voltage rejection f = 100hz, v ripple =1v rms 40 50 db t s thermal shutdown 145 c mute/stand-by function (ref. v s ) vt st-by stand-by - threshold 1 1.8 v vt play play threshold 2.7 4 v i q st-by quiescent current @ stand-by v pin 3 = 0.5v 1 3 ma att st-by stand-by attenuation 70 90 db i pin3 pin 3 current @ stand-by 1 +10 m a note (*): music power concept music power is ( according to the iec clauses n.268-3 of jan 83) 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. according to this definition our method of measurement comprises the following steps: 1) set the voltage supply at the maximum operating value -10% 2) apply a input signal in the form of a 1khz tone burst of 1 sec duration; the repetition period of the signal pulses is > 60 sec 3) the output voltage is measured 1 sec from the start of the pulse 4) increase the input voltage until the output signal show a thd = 10% 5) the music power is then v 2 out /r1 , where v out is the output voltage measured in the condition of point 4) and r1 is the rated load impedance the target of this method is to avoid excessive dissipation in the amplifier. thermal data symbol description value unit r th j-case thermal resistance junction-case max 2.5 c/w TDA2052 3/13
applications suggestions (see test and application circuit) the recommended values of the external components are those shown on the application circuit. differ- ent values can be used; the following table can help the designer. comp. value purpose larger than smaller than r1 22k w (*) input impedance increase of input impedance decrease of input impedance r2 560 w closed loop gain set to 32db (**) decrease of gain increase of gain r3 22k w (*) increase of gain decrease of gain r4 22k w (*) input impedance @ mute r5 22k w stand-by time constant r6 4.7 w frequency stability danger of oscillations danger of oscillations c1 1 m f input dc decoupling higher low-frequency cut-off c2 10 m f feedback dc decoupling higher low-frequency cut-off c3 10 m f stand-by time constant c4 0.100 m f frequency stability danger of oscillations c5, c6 1000 m f supply voltage bypass (*) r1 = r3 = r4 for pop optimization (**) closed loop gain has to be 30db figure 1: output power vs. supply voltage figure 2: distortion vs. output power typical characteristics TDA2052 4/13
figure 3: output power vs. supply voltage. figure 4: distortion vs. output power. figure 5: distortion vs. frequency. figure 6: distortion vs. frequency. figure 7: quiescent current vs. supply voltage figure 8: supply voltage rejection vs. frequency. TDA2052 5/13
figure 9: bandwidth. figure 10: output attenuation & quiescent cur- rent vs. v pin3 . figure 11: total power dissipation & efficiency vs. output power. figure 12: total power dissipation & efficiency vs. output power. TDA2052 6/13
figure 13: p.c. board and components layout of the circuit of fig. 14 (1:1 scale) figure 14: demo board schematic. TDA2052 7/13
mute/stand-by function the pin 3 (mute/stand-by) controls the ampli- fier status by three different thresholds, referred to -v s . when its voltage is lower than the first threshold (1v, with a +70mv hysteresis), the amplifier is in stand-by and all the final stage current gener- ators are off. only the input mute stage is on in order to prevent pop-on problems. at v pin3 =1.8v the final stage current generators are switched on and the amplifier operates in mute. for v pin3 =2.7v the amplifier is definitely on (play condition) figure 15. TDA2052 8/13
short-circuit protection the tda 2052 has an original circuit which pro- tects the device during accidental short-circuit be- tween output and gnd / -vs / +vs, taking it in stand-by mode, so limiting also dangerous dc current flowing throught the loudspeaker. if a short-circuit or an overload dangerous for the final transistors are detected, the concerned soa circuit sends out a signal to the latching circuit (with a 10 m s delay time that prevents fast random spikes from inadvertently shutting the amplifier off) which makes q 1 and q 2 saturate (see block diagram). q 1 immediately short-circuits to ground the a point turning the final stage off while q 2 short-circuits to ground the external capacitor driving the pin 3 (mute/stand-by) towards zero potential. only when the pin 3 voltage becomes lower than 1v, the latching circuit is allowed to reset itself and restart the amplifier, provided that the short- circuit condition has been removed. in fact, a win- dow comparator is present at the output and it is aimed at preventing the amplifier from restarting if the output voltage is lower than 0.35 total supply voltage or higher than 0.65 total supply voltage. if the output voltage lies between these two thresholds, one may reasonably suppose the short-circuit has been removed and the amplifier may start operating again. the play/mute/stand-by function pin (pin 3) is both ground- and positive supply-compatible and can be interfaced by means of the r 5 ,c 3 net either to a ttl or cmos output ( m -processor) or to a specific application circuit. the r 5 ,c 3 net is fundamental, because connect- ing this pin directly to a low output impedance driver such as ttl gate would prevent the correct operation during a short-circuit. actually a final stage overload turns on the protection latching circuit that makes q 2 try to drive the pin 3 voltage under 0.8 v. since the maximum current this pin can stand is 3 ma, one must make sure the fol- lowing condition is met: r 5 ( v a - 0.7v ) 3ma that yields: r 5, min = 1.5 k w with v a =5v. in order to prevent pop-on and -off transients, it is advisable to calculate the c 3 ,r 5 net in such a way that the stand-by/mute and mute/play threshold crossing slope (positive at the turn-on and vice-versa) is less than 100 v/sec. figure 16: thermal protection block diagram thermal protection the thermal protection operates on the 125 m a current generator, linearly decreasing its value from 90 c on. by doing this, the a voltage slowly decreases thus switching the amplifier first to mute (at 145 c) and then to stand-by (155 c). figure 17: maximum allowable power dissipa- tion vs. ambient temperature. the maximum allowable power dissipation de- pends on the size of the external heatsink (ther- mal resistance case-ambient); figure 17 shows the dissipable power as a function of ambient temperature for different thermal resistance. TDA2052 9/13
figure 18: multiway application circuit application notes 90w multiway speaker system the schematic diagram of figure 18, shows the solution that we have closen as a suggestion for hi-fi and especially tv applications. the multiway system provides the separation of the musical signal not only for the loudspeakers, but also for the power amplifiers with the following advantages: - reduced power level required of each individ- ual amplifier - complete separation of the ways (if an ampli- fier is affected by clipping distortion, the oth- ers are not) - protection of tweeters (the high power har- monics generated by low frequency clipping can not damage the delicate tweeters that are driven by independent power amplifier) - high power dedicated to low frequencies TDA2052 10/13
figure 21: distortion vs output power (midrange/tweeter) figure 20: distortion vs output power (subwoofer) figure 19: frequency response as shown in figure 19, the r-c passive network for low-pass and high-pass give a cut with a slope of 12db/octave a further advantage of this application is that con- necting each speaker direcly to its amplifier, the musical signal is not modified by the variations of the impedance of the crossover over frequency. the subwoofer is designed for obtaining high sound pressure level with low distortion without stereo effect. in the application of figure 18, the subwoofer plays the 20 to 300 hz frequency range, while the remaining 300 hz to 20khz are sent to two sepa- rate channels with stereo effect. the multiway system makes use of three TDA2052, one for driving the subwoofer with p out higher than 40w (thd = 10%), 28w undis- torted (thd = 0.01%), while the others two TDA2052 are used for driving the mid/high fre- quency speakers of l/r channels, delivering p out = 25w (thd = 10%) and 20w @ thd = 0.01% TDA2052 11/13
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 TDA2052 12/13
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 from 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 supplied. 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 printed in italy all rights reserved heptawatt ? is a trademark of the sgs-thomson microelectronics sgs-thomson microelectronics group of companies australia - brazil - canada - china - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. TDA2052 13/13

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