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TDA1905 5w audio amplifier with muting description the TDA1905 is a monolithic integrated circuit in powerdip package, intended for use as low frequency power amplifier in a wide range of appli- cations in radio and tv sets: C muting facility C protection against chip over temperature C very low noise C high supply voltage rejection C low "switch-on" noise C voltage range 4v to 30v the tda 1905 is assembled in a new plastic pack- age, the powerdip, that offers the same assembly ease, space and cost saving of a normal dual in-line package but with a power dissipation of up to 6w and a thermal resistance of 15 c/w (junction to pins). march 1993 symbol parameter value unit v s supply voltage 30 v i o output peak current (non repetitive) 3 a i o output peak current (repetitive) 2.5 a v i input voltage 0 to + v s v v i differential input voltage 7 v v 11 muting thresold voltage v s v p tot power dissipation at t amb = 80 c 1w t case = 60 c 6w t stg , t j storage and junction temperature -40 to 150 c absolute maximum ratings application circuit powerdip (8 + 8) ordering number : tda 1905 1/14
symbol parameter value unit r th-j-case thermal resistance junction-pins max 15 c/w r th-j-amb thermal resistance junction-ambient max 70 c/w thermal data 2/14 pin connection (top view) schematic diagram TDA1905
test circuits: without muting with muting function 3/14 TDA1905
symbol parameter test conditions min. typ. max. unit v s supply voltage 4 30 v v o quiescent output voltage v s = 4v v s = 14v v s = 30v 1.6 6.7 14.4 2.1 7.2 15.5 2.5 7.8 16.8 v i d quiescent drain current v s = 4v v s = 14v v s = 30v 15 17 21 35 ma v ce sat output stage saturation voltage i c = 1a i c = 2a 0.5 1 v p o output power d = 10% v s = 9v v s = 14v v s = 18v v s = 24v f = 1khz r l = 4 w (*) r l = 4 w r l = 8 w r l = 16 w 2.2 5 5 4.5 2.5 5.5 5.5 5.3 w d harmonic distortion f = 1khz v s = 9v r l = 4 w p o = 50 mw to 1.5w v s = 14v r l = 4 w p o = 50 mw to 3w v s = 18v r l = 8 w p o = 50 mw to 3w v s = 24v r l = 16 w p o = 50 mw to 3w 0.1 0.1 0.1 0.1 % v i input sensitivity f = 1khz v s = 9v v s = 14v v s = 18v v s = 24v r l = 4 w r l = 4 w r l = 8 w r l = 16 w p o = 2.5w p o = 5.5w p o = 5.5w p o = 5.3w 37 49 73 100 mv v i input saturation voltage (rms) v s = 9v v s = 14v v s = 18v v s = 24v 0.8 1.3 1.8 2.4 v r i input resistance (pin 8) f = 1khz 60 100 k w i d drain current f = 1khz v s = 9v v s = 14v v s = 18v v s = 24v r l = 4 w r l = 4 w r l = 8 w r l = 16 w p o = 2.5w p o = 5.5w p o = 5.5w p o = 5.3w 380 550 410 295 ma h efficiency f = 1khz v s = 9v v s = 14v v s = 18v v s = 24v r l = 4 w r l = 4 w r l = 8 w r l = 16 w p o = 2.5w p o = 5.5w p o = 5.5w p o = 5.3w 73 71 74 75 % electrical characteristics (refer to the test circuit, t amb = 25 c, r th (heatsink) = 20 c/w, unless otherwisw specified) (*) with an external resistor of 100 w between pin 3 and +v s . 4/14 TDA1905
symbol parameter test conditions min. typ. max. unit bw small signal bandwidth (-3db) v s = 14v r l = 4 w p o = 1w 40 to 40,000 hz g v voltage gain (open loop) v s = 14v f = 1khz 75 db g v voltage gain (closed loop) v s = 14v f = 1khz r l = 4 w p o = 1w 39.5 40 40.5 db e n total input noise r g = 50 w r g = 1k w r g = 10k w ( ) 1.2 1.3 1.5 4.0 m v r g = 50 w r g = 1k w r g = 10k w ( ) 2.0 2.0 2.2 6.0 m v s/n signal to noise ratio v s = 14v p o = 5.5w r l = 4 w r g = 10k w r g = 0 ( ) 90 92 db r g = 10k w r g = 0 ( ) 87 87 db svr supply voltage rejection v s = 18v r l = 8 w f ripple = 100 hz rg = 10k w v ripple = 0.5v rms 40 50 db t sd thermal shut-down case temperatura (*) p tot = 2.5w 115 c muting function vt off muting-off threshold voltage (pin 4) 1.9 4.7 v vt on muting-on threshold voltage (pin 4) 0 1.3 v 6.2 v s r 5 input-resistance (pin 5) muting off 80 200 k w muting on 10 30 w r 4 input resistance (pin 4) 150 k w a t muting attenuation r g + r 1 = 10k w 50 60 db electrical characteristics (continued) note: ( ) weighting filter = curve a. ( ) filter with noise bandwidth: 22 hz to 22 khz. (*) see fig. 30 and fig. 31 5/14 TDA1905
figure 1. quiescent output voltage vs. supply voltage figure 2. quiescent drain current vs. supply voltage figure 3. output power vs. supply voltage figure 4. distortion vs. output power (r l = 16 w ) figure 5. distortion vs. output power (r l = 8 w ) figure 6. distortion vs. output power (r l = 4 w ) figure 7. distortion vs. frequency (r l = 16 w ) figure 8. distortion vs. frequency (r l = 8 w ) figure 9. distortion vs. frequency (r l = 4 w ) 6/14 TDA1905
figure 10. open loop fre- quency response figure 11. output power vs. input voltage figure 12. value of capaci- tor cx vs. bandwidth (bw) and gain (gv) figure 13. supply voltage re- jection vs. voltage gain (ref. to the muting circuit) figure 14. supply voltage re- ection vs. source resistance figure 15. max power dissi- pation vs. supply voltage (sine wave operation) figure 16. power dissipa- tion and efficiency vs. output power figure 17. power dissipa- tion and efficiency vs. output power figure 18. power dissipa- tion and efficiency vs. output power 7/14 TDA1905
8/14 application information figure 19. application circuit without muting figure 20. pc board and components lay-out of the circuit of fig. 19 (1 : 1 scale) figure 21. application circuit with muting figure 22. delayed muting circuit TDA1905
application information (continued) figure 23. low-cost application circuit without bootstrap. figure 25. two position dc tone control using change of pin 5 resistance (muting function) figure 27. bass bomb tone control using change of pin 5 resistance (muting function) figure 24. output power vs. supply voltage (circuit of fig. 23) figure 26. freq uency re- sponse of the circuit of fig. 25 figure 28. freq uency re- sponse of the circuit of fig. 27 9/14 TDA1905
10/14 muting function the output signal can be inhibited applying a dc voltage v t to pin 4, as shown in fig. 29 figure 29 the input resistance at pin 5 depends on the threshold voltage v t at pin 4 and is typically : r 5 = 200 k w @ 1.9v v t 4.7v muting-off r5 = 10 w @ 0v vt 1.3v muting-on 6v vt v s referring to the following input stage, the possible attenuation of the input signal and therefore of the output signal can be found using the following expression: considering r g = 10 k w the attenuation in the muting-on condition is typically a t = 60 db. in the muting-off condition, the attenuation is very low, typically 1.2 db. a very low current is necessary to drive the thresh- old voltage v t because the input resistance at pin 4 is greater than 150 k w . the muting function can be used in many cases, when a temporary inhibition of the output signal is requested, for example: C in switch-on condition, to avoid preamplifier power-on transients (see fig. 22) a t = v i v 8 = r g + ( r 8 r 5 r 8 + 5 ) ( r 8 r 5 r 8 + r 5 ) where r8 @ 100 k w C during switching at the input stages. C during the receiver tuning. the variable impedance capability at pin 5 can be useful in many applications and two examples are shown in fig. 25 and 27, where it has been used to change the feedback network, obtaining 2 different frequency responses. TDA1905
application suggestion the recommended values of the external components are those shown on the application circuit of fig. 21. when the supply voltage v s is less than 10v, a 100 w resistor must be connected between pin 2 and pin 3 in order to obtain the maximum output power. different values can be used. the following table can help the designer. component raccom. value purpose larger than recommended value smaller than recommended value allowed range min. max. r g + r 1 10k w input signal imped. for muting operation increase of the attenuation in muting-on condition. decrease of the input sensitivity. decrease of the attenu- ation in muting on condition. r 2 10k w feedback resistors increase of gain. decrease of gain. increase quiescent current. 9 r 3 r 3 100 w decrease of gain. increase of gain. 1k w r 4 1k w frequency stability danger of oscillation at high frequencies with inductive loads. r 5 100 w increase of the output swing with low supply voltage. 47 330 p 1 20k w volume potentiometer increase of the switch-on noise. decrease of the input impedance and of the input level. 10k w 100k w c 1 c 2 c 3 0.22 m f input dc decoupling. higher cost lower noise. higher low frequency cutoff. higher noise. c 4 2.2 m f inverting input dc decoupling. increase of the switch- on noise. higher low frequency cutoff. 0.1 m f c 5 0.1 m f supply voltage bypass. danger of oscillations. c 6 10 m f ripple rejection increase of svr increase of the switch-on time degradation of svr 2.2 m f 100 m f c 7 47 m f bootstrap. increase of the distortion at low frequency. 10 m f 100 m f c 8 0.22 m f frequency stability. danger of oscillation. c 9 1000 m f output dc decoupling. higher low frequency cutoff. 11/14 TDA1905
12/14 thermal shut-down the presence of a thermal limiting circuit offers the following advantages: 1) an overload on the output (even if it is permanent), 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 damage due to high junction temperature. if for any reason, the junction temperature increases up to 150 c, the thermal shut-down simply reduces the power dissipation and the current consumption. the maximum allowable power dissipation depends upon the size of the external heatsink (i.e. its thermal resistance); fig. 32 shows this dissipable power as a function of ambient temperature for different thermal resistance. figure 30. output power and drain current vs. case temperature figure 31. output power and drain current vs. case temperature figure 32. maximum allo- wable power dissipation vs. ambient temperature mounting instruction : see tda1904 TDA1905
dim. mm inch min. typ. max. min. typ. max. a1 0.51 0.020 b 0.85 1.40 0.033 0.055 b 0.50 0.020 b1 0.38 0.50 0.015 0.020 d 20.0 0.787 e 8.80 0.346 e 2.54 0.100 e3 17.78 0.700 f 7.10 0.280 i 5.10 0.201 l 3.30 0.130 z 1.27 0.050 powerdip package mechanical data 13/14 TDA1905
14/14 information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics as sumes 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. specifications ment ioned in this publication are subject to change without not ice. this publication supersedes and replaces all information previously supplied. sgs-thomson microelectronics products are not authorized for use as criti cal components in life support dev ices or systems without express written approval of sgs-thomson microelectronics. ? 1994 sgs-thomson microelectronics - all rights reserved sgs-thomson microelectronics group of companies australia - brazil - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the netherlands - sing apore - spain - sweden - switzerland - taiwan - thal iand - united kingdom - u.s.a. TDA1905

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