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tda2050 32w hi-fi audio power amplifier high output power (50w music power iec 268.3 rules) high operating supply voltage (50v) single or split supply operations very low distortion short circuit protection (out to gnd) thermal shutdown description the tda 2050 is a monolithic integrated circuit in pentawatt package, intended for use as an audio class ab audio amplifier. thanks to its high power capability the tda2050 is able to provide up to 35w true rms power into 4 ohm load @ thd = 10%, v s = 18v, f = 1khz and up to 32w into 8ohm load @ thd = 10%, v s = 22v, f = 1khz. moreover, the tda 2050 delivers typically 50w music power into 4 ohm load over 1 sec at v s = 22.5v, f = 1khz. the high power and very low harmonic and cross- over distortion (thd = 0.05% typ, @ v s = 22v, p o = 0.1 to 15w, r l =8ohm, f = 100hz to 15khz) make the device most suitable for both hifi and high class tv sets. this is advanced information on a new product now in development or undergoing evaluation. details are subject to change without notice. march 1995 test and application circuit pentawatt ordering numbers: TDA2050V tda2050h 1/13
schematic diagram absolute maximum ratings symbol parameter value unit v s supply voltage 25 v v i input voltage v s v i differential input voltage 15 v i o output peak current (internally limited) 5 a p tot power dissipation t case =75 c25w 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 3 c/w pin connection (top view) tda2050 2/13
electrical characteristics (refer to the test circuit, v s = 18v, t amb =25 c, f = 1 khz; un- less otherwise specified) symbol parameter test condition min. typ. max. unit v s supply voltage range 4.5 25 v i d quiescent drain current v s = 4.5v v s = 25v 30 55 50 90 ma ma i b input bias current v s = 22v 0.1 0.5 m a v os input offset voltage v s = 22v 15 mv i os input offset current v s = 22v 200 na p o rms output power d = 0.5% r l =4 w r l =8 w v s = 22v r l =8 w 24 22 28 18 25 w w w d = 10% r l =4 w r l =8 w v s = 22v r l =8 w 35 22 32 w w w music power iec268.3 rules d = 10%; t = 1s v s = 22.5v; r l =4 w 50 w d total harmonic distortion r l =4 w f = 1khz, p o = 0.1 to 24w f = 100hz to 10khz, p o = 0.1 to 18w 0.03 0.5 0.5 % % v s = 22v r l =8 w f = 1khz, p o = 0.1 to 20w f = 100hz to 10khz, p o = 0.1 to 15w 0.02 0.5 % % sr slew rate 5 8 v/ m s g v open loop voltage gain 80 db g v closed loop voltage gain 30 30.5 31 db bw power bandwidth (-3db) r l =4 w v i = 200mv 20 to 80,000 hz e n total input noise curve a b = 22hz to 22khz 4 510 m v m v r i input resistance (pin 1) 500 k w svr supply voltage rejection r s = 22k w ; f = 100hz; v ripple = 0.5vrms 45 db h efficiency p o = 28w; r l =4 w 65 % p o = 25w; r l =8 w ; v s = 22v 67 % t sd- j thermal shut-down junction temperature 150 c tda2050 3/13
figure 1: split supply typical application circuit r3 r2 r1 c2 c4 c3 r4 c5 c6 c1 c7 +vs r l -vs tda2050 vi figure 2: p.c. board and components layout of the circuit of fig. 1 (1:1) tda2050 4/13
split supply application suggestions the recommended values of the external compo- nents are those shown on the application circuit of fig. 2. different values can be used. the follow- ing table can help the designer. component recommended value purpose larger than recommended value smaller than recommended value r1 22k w input impedance increase of input impedance decrease of input impedance r2 680 w feedback resistor decrease of gain (*) increase of gain r3 22k w increase of gain decrease of gain (*) r4 2.2 w frequency stability danger of oscillations c1 1 m f input decoupling dc higher low-frequency cut-off c2 22 m f inverting input dc decoupling increase of switch on/off noise higher low-frequency cut-off c3 c4 100nf supply voltage bypass danger of oscillations c5 c6 220 m f supply voltage bypass danger of oscillations c7 0.47 m f frequency stability danger of oscillations (*) the gain must be higher than 24db printed circuit board the layout shown in fig. 2 should be adopted by the designers. if different layouts are used, the ground points of input 1 and input 2 must be well decoupled from the ground return of the output in which a high current flows. tda2050 5/13
figure 3: single supply typical application circuit figure 4: p.c. board and components layout of the circuit of fig. 3 (1:1) tda2050 6/13
single supply application suggestions the recommended values of the external compo- nents are those shown on the application circuit of fig. 3. different values can be used. the follow- ing table can help the designer. component recommended value purpose larger than recommended value smaller than recommended value r1, r2, r3 22k w biasing resistor r4 22k w feedback resistors increase of gain decrease of gain (*) r5 680 w decrease of gain (*) increase of gain r6 2.2 w frequency stability danger of oscillations c1 2.2 m f input decoupling dc higher low-frequency cut-off c2 100 m f supply voltage rejection worse turn-off transient worse turn-on delay c3 1000 m f supply voltage bypass danger of oscillations worse of turn-off transient c4 22 m f inverting input dc decoupling increase of switching on/off higher low-frequency cut-off c5 100nf supply voltage bypass danger of oscillations c6 0.47 m f frequency stability danger of oscillations c7 1000 m f output dc decoupling higher low-frequency cut-off (*) the gain must be higher than 24db typical characteristics (split supply test circuit unless otherwise specified) note if the supply voltage is lower than 40v and the load is 8ohm (or more) a lower value of c2 can be used (i.e. 22 m f). c7 can be larger than 1000uf only if the supply voltage does not exceed 40v. figure 5: output power vs. supply voltage figure 6: distortion vs. output power tda2050 7/13
figure 10: distortion vs. frequency figure. 9: distortion vs. frequency figure 8: distortion vs. output power figure 12: supplyvoltage rejection vs. frequency figure 11: quiescent current vs. supply voltage figure 7: output power vs. supply voltage tda2050 8/13
short circuit protection the tda 2050 has an original circuit which limits the current of the output transistors. the maxi- mum output current is a function of the collector emitter voltage; hence the output transistors work within their safe operating area. this function can therefore be considered as being peak power lim- iting rather than simple current limiting. it reduces the possibility that the device gets damaged during an accidental short circuit from ac output to ground. thermal shutdown the presence of a thermal limiting circuit offers the following advantages: 1)an overload on the output (even if it is perma- nent), or an above limit ambient temperature can be easily tolerated since the tj cannot be higher than 150 c. 2)the heatsink can have a smaller factor of safety compared with that of a conventional circuit. there is no possibility of device dam- age due to high junction temperature. if for any reason, the junction temperature in- creases up to 150 c, the thermal shutdown simply reduces the power dissipation and the current consumption. the maximum allowable power dissipation de- pends upon the thermal resistance junction-ambi- figure 13: supply voltage rejection vs. fre- quency (single supply) for different values of c2 (circuit of fig. 3) figure 14: supply voltage rejection vs. fre- quency (single supply) for different values of c2 (circuit of fig. 3) figure 15: total power dissipation and effi- ciency vs. output power figure 16: total power dissipation and effi- ciency vs. output power tda2050 9/13
ent. fig. 17 shows this dissipable power as a function of ambient temperature for different ther- mal resistance. mounting instructions the power dissipated in the circuit must be re- moved by adding an external heatsink. thanks to the pentawatt package, the heatsink mounting operation is very simple, a screw or a compression spring (clip) being suffi- cient. between the heatsink and the package is better to insert a layer of silicon grease, to opti- mize the thermal contact; no electrical isolation is needed between the two surfaces. fig. 18 shows an example of heatsink. dimension suggestion the following table shows the length that the heatsink in fig. 18 must have for several values of ptot and rth. p tot (w) 12 8 6 lenght of heatsink (mm) 60 40 30 r th of heatsink ( c/w) 4.2 6.2 8.3 figure 18: example of heat-sink figure 17: maximum allowable power dissipa- tion vs. ambient temperature a.1 - music power concept music power is (according to the iec clauses n.268-3 of jan 83) the maximum 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 1 khz. according to this definition our method of meas- urement comprises the following steps: - set the voltage supply at the maximum oper- ating value; - 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; - the output voltage is measured 1 sec from the start of the pulse; - increase the input voltage until the output sig- nal shows a thd=10%; - the music power is then v 2 out /rl, where vout is the output voltage measured in the condition of point 4 and rl is the rated load impedance; the target of this method is to avoid excessive dissipation in the amplifier. a.2 - instantaneous power another power measurement (maximum in- stantaneous output power) was pro- posed by iec in 1988 (iec publication 268-3 sub- clause 19.a). we give here only a brief extract of the concept, and a circuit useful for the measurement. the supply voltage is set at the maximum operat- ing value. the test signal consists of a sinusoidal signal whose frequency is 20 hz, to which are added al- ternate positive and negative pulses of 50 m s du- ration and 500 hz repetition rate. the amplitude of the 20 hz signal is chosen to drive the amplifier to its voltage clipping limits, while the amplitude of the pulses takes the amplifier alternately into its current-overload limits. appendix a tda2050 10/13
a circuit for generating the test signal is given in fig. 19. the load network consists of a 40 m f capacitor, in series with a 1 ohm resistor. the capacitor limits the current due to the 20 hz signal to a low value, whereas for he short pulses the effective load im- pedance is of the order of 1 ohm, and a high out- put current is produced. using this signal and load network the measure- ment may be made without causing excessive dissipation in the amplifier. the dissipation in the 1 ohm resistor is much lower than a rated output power of the amplifier, because the duty-cycle of the high output current is low. by feeding the amplifier output voltage to the x- plates of an oscilloscope, and the voltage across the 1 ohm resistor (representing the output cur- rent) to the y=plates, it is possible to read on the display the value of the maximum instantaneous output power. the result of this test applied at the tda 2050 is: peak power = 100w typ figure 19: test circuit for peak power measurement tda2050 11/13
l2 l3 l5 l7 l6 dia. a c d e d1 h3 h2 f g g1 l1 l mm1 f1 pentawatt 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 0.8 1.05 0.031 0.041 f1 1 1.4 0.039 0.055 g 3.4 0.126 0.134 0.142 g1 6.8 0.260 0.268 0.276 h2 10.4 0.409 h3 10.05 10.4 0.396 0.409 l 17.85 0.703 l1 15.75 0.620 l2 21.4 0.843 l3 22.5 0.886 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 4.5 0.177 m1 4 0.157 dia 3.65 3.85 0.144 0.152 tda2050 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. specifications men- tioned 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 ex- press written approval of sgs-thomson microelectronics. ? 1994 sgs-thomson microelectronics - all rights reserved pentawatt ? is a registered trademark of sgs-thomson microelectronics sgs-thomson microelectronics group of companies australia - brazil - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thaliand - united kingdom - u.s.a. tda2050 13/13

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