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this is information on a product in full production. april 2012 doc id 16988 rev 2 1/26 26 STA541SA 2 x 20 w dual br idge amplifier datasheet ? production data features high output power capability ? 2x 20 w into 8 at 17 v with 10% thd ? 2x 18 w into 4 at 12 v with 10% thd minimum external components count: ? no bootstrap capacitors ? no boucherot cells ? internally fixed gain 26 db standby function (cmos compatible) no audible pop during standby operations diagnostic facilities: ? clip detector ? output to ground short-circuit detector ? output to supply short-circuit detector ? soft short-circuit check at turn-on ? thermal shutdown warning protection output ac/dc short circuit soft short-circuit check at turn-on thermal cutoff/limiter to prevent chip from overheating high inductive loads esd description the STA541SA is a dual bridge, class-ab audio amplifier designed for high quality sound applications. the amplifiers have outputs with integrated short- circuit protection, thermal protection and diagnostic functions. the chip is housed in the 15-pin clipwatt, environmentally friendly, ecopack ? package. clipwatt15 table 1. device summary order code operating temp. range package packaging STA541SA 0 to 70 c clipwatt15 tube www.st.com
contents STA541SA 2/26 doc id 16988 rev 2 contents 1 block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 characterization curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.1 for 4- loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.2 for 8- loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6 thermal information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.1 heatsink specification examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.1.1 r th_hs calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.1.2 calculations using music power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7 practical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.1 internally fixed gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.2 silent turn on/off and muting/standby function . . . . . . . . . . . . . . . . . . . . . 17 7.3 driving circuit for standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.4 built?in protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.4.1 diagnostic facilities (pin 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.4.2 short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.4.3 clipping detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.4.4 thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7.5 handling the diagnostic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
STA541SA contents doc id 16988 rev 2 3/26 7.6 pcb ground layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7.7 mute function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
list of figures STA541SA 4/26 doc id 16988 rev 2 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 2. pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 3. output power vs supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 4. quiescent current vs supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 5. efficiency, device dissipation vs output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 6. total harmonic distortion vs output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 7. crosstalk vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 8. output power vs supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 9. quiescent current vs supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 10. efficiency, device dissipation vs output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 11. total harmonic distortion vs output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 figure 12. crosstalk vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 13. power supply rejection ratio vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 figure 14. applications circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 15. demonstration board schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 16. pcb layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 17. clipping detection wave forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 figure 18. configuration of pin diag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 19. fault waveforms on pin diag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 20. waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 21. interface circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 22. optional mute function circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 23. package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
STA541SA list of tables doc id 16988 rev 2 5/26 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 3. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 4. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 5. recommended operating condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 6. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 7. package dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 table 8. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
block diagram and pin description STA541SA 6/26 doc id 16988 rev 2 1 block diagram and pin description 1.1 block diagram figure 1. block diagram + ? + ? + ? + ? 7 4 12 10 13 3 2 1 15 14 8 9 5 vcc2 vcc1 out 1+ out 1- out 2+ out 2- s-gnd p-gnd svr diag in 2 in 1 st-by STA541SA + ? + ? + ? + ? 7 4 12 10 13 3 2 1 15 14 8 9 5 vcc2 vcc1 out 1+ out 1- out 2+ out 2- s-gnd p-gnd svr diag in 2 in 1 st-by STA541SA out1+ out2+ out2- out1- sgnd pgnd svr vcc2 vcc1 in2 diag stby in1
STA541SA block diagram and pin description doc id 16988 rev 2 7/26 1.2 pin description figure 2. pin connection (top view) table 2. pin description pin name type function 1 out1+ out channel 1 non-inverting output 2 out1 - out channel 1 inverting output 3 vcc1 pwr power supply 4 in1 in channel 1 input 5 svr in supply voltage rejection 6 n.c. - no internal connection 7 stby in standby control 8 pgnd pwr power ground 9 sgnd pwr signal ground 10 diag out diagnostics output 11 n.c. - no internal connection 12 in2 in channel 2 input 13 vcc2 pwr power supply 14 out2- out channel 2 inverting output 15 out2+ out channel 2 non-inverting output n.c svr diag n.c svr diag out2+ out2- vcc2 in2 n.c. diag sgnd pgnd stby n.c. svr in1 vcc1 out1- out1+
electrical specifications STA541SA 8/26 doc id 16988 rev 2 2 electrical specifications 2.1 absolute maximum ratings warning: stresses beyond those listed in table 3 above may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating conditions? are not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. in the real application, power supplies with nominal values rated within the recommended operating conditions, may rise beyond the maximum operating conditions for a short time when no or very low current is sunk (amplifier in mute state). in this case the reliability of the device is guaranteed, provided that the absolute maximum ratings are not exceeded. 2.2 thermal data table 3. absolute maximum ratings symbol parameter min typ max unit v s supply voltage idle mode (no signal) - - 24 v supply voltage operating - - 22 v supply voltage ac-dc short safe - - 20 v p tot total power dissipation (t case = 85 c) - - 32 w t j junction temperature -40 - 150 c t stg storage temperature -40 - 150 c t amb ambient temperature 0 - 70 c table 4. thermal data symbol parameter min typ max unit r th j-case thermal resistance junction-case - - 2.5 c/w r th j-amb thermal resistance junction-ambient - - 45 c/w
STA541SA electrical specifications doc id 16988 rev 2 9/26 2.3 recommended operating conditions 2.4 electrical characteristics the test conditions are v s = 17 v, r l = 8 , f = 1 khz, t amb = 25 c unless otherwise specified. table 5. recommended operating condition symbol parameter min typ max unit v s power supply voltage (vcc1, vcc2) 8 - 22 v t amb ambient temperature 0 - 70 c table 6. electrical characteristics symbol parameter test condition min typ max unit i d total quiescent drain current --80150ma v os output offset voltage - -150 - 150 mv p o output power thd = 10% thd = 1% - - 20 15.6 - - w output power thd = 10%, r l =4 , v s = 12 v -18-w thd total harmonic distortion p o = 0.1 to 4 w - 0.02 - % i sc short-circuit output current - 3.0 3.5 a c t crosstalk f = 1 khz f = 10 khz 55 - 70 60 - - db r in input impedance - 10 15 - k g v voltage gain - 25 26 27 db g v voltage gain match - - - 0.5 db e n input noise voltage r gen = 0, f = 22 hz to 22 khz -3.5-v svr supply voltage rejection r gen = 0, f = 300 hz, c svr = 470 f 50 - - db a stby standby attenuation p o = 1 w 80 90 - db i stby current consumption in standby v stby = 0 to 1.5 v - - 100 a v sb st_by in threshold voltage ---1.5v st_by out threshold voltage -3.5--v
electrical specifications STA541SA 10/26 doc id 16988 rev 2 i stby pin st-by current play mode, v stby = 5 v --50a max driving current under fault --5ma i cd_off clipping detector output average current thd = 1% - 90 - a i cd_on clipping detector output average current thd = 5% -160-a v diag saturation voltage on pin diag i diag = 1 ma sinking - - 0.7 v t w thermal warning - - 140 - c t m thermal muting - - 150 - c t s thermal shutdown - - 160 - c table 6. electrical characteristics (continued) symbol parameter test condition min typ max unit
STA541SA characterization curves doc id 16988 rev 2 11/26 3 characterization curves 3.1 for 4- loads figure 3. output power vs supply voltage figure 4. quiescent current vs supply voltage 10% thd 1% thd r l = 4 f = 1 khz t amb = 25 c 10% thd 1% thd r l = 4 f = 1 khz t amb = 25 c r l = 4 t amb = 25 c figure 5. efficiency, device dissipation vs output power figure 6. total harmonic distortion vs output power r l = 4 v s = 12 v f = 1 khz t amb = 25 c 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 thd % 100 30 200 500 1 2 5 10 20 power out, w f = 15 khz f = 1 khz f = 100 hz r l = 4 v s = 12 v t amb = 25 c 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 thd % 100 30 200 500 1 2 5 10 20 power out, w f = 15 khz f = 1 khz f = 100 hz r l = 4 v s = 12 v t amb = 25 c figure 7. crosstalk vs frequency -120 0 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 crosstalk db 20 20k 50 100 200 500 1k 2k 5k 10k frequency, hz r l = 4 v s = 12 v f = 1 khz p o = 1 w t amb = 25 c specification: < -45 db -120 0 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 -120 0 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 crosstalk db 20 20k 50 100 200 500 1k 2k 5k 10k frequency, hz r l = 4 v s = 12 v f = 1 khz p o = 1 w t amb = 25 c specification: < -45 db
characterization curves STA541SA 12/26 doc id 16988 rev 2 3.2 for 8- loads figure 8. output power vs supply voltage figure 9. quiescent current vs supply voltage 10% thd 1% thd r l = 8 f = 1 khz t amb = 25 c 10% thd 1% thd r l = 8 f = 1 khz t amb = 25 c r l = 8 t amb = 25 c figure 10. efficiency, device dissipation vs output power figure 11. total harmonic distortion vs output power pd r l = 8 v s = 17 v f = 1 khz t amb = 25 c pd r l = 8 v s = 17 v f = 1 khz t amb = 25 c 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 thd % 0.1 30 0.2 0.5 1 2 5 10 20 power output, w f = 15 khz f = 100 hz f = 1 khz r l = 8 v s = 17 v t amb = 25 c 0.01 10 0.02 0.05 0.1 0.2 0.5 1 2 5 thd % 0.1 30 0.2 0.5 1 2 5 10 20 power output, w f = 15 khz f = 100 hz f = 1 khz r l = 8 v s = 17 v t amb = 25 c figure 12. crosstalk vs frequency figure 13. power supply rejection ratio vs frequency crosstalk db 20 20k 50 100 200 500 1k 2k 5k 10k frequency, hz r l = 8 v s = 17 v f = 1 khz p o = 1 w t amb = 25 c specification: < -45 db -120 0 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 crosstalk db 20 20k 50 100 200 500 1k 2k 5k 10k frequency, hz r l = 8 v s = 17 v f = 1 khz p o = 1 w t amb = 25 c specification: < -45 db -120 0 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 70 0 65 60 55 50 45 40 35 30 25 20 15 10 5 psrr dbra 20 20k 50 100 200 500 1k 2k 5k 10k frequency, hz r l = 8 v s = 17 v v r = 500 mv rms t amb = 25 c specification: > 50 db 70 0 65 60 55 50 45 40 35 30 25 20 15 10 5 psrr dbra 20 20k 50 100 200 500 1k 2k 5k 10k frequency, hz r l = 8 v s = 17 v v r = 500 mv rms t amb = 25 c specification: > 50 db
STA541SA applications doc id 16988 rev 2 13/26 4 applications figure 14. applications circuit # # 6 $ . ' & u & n + $ . ' 3 ' ! ) $ # # 6 4 5 / 4 5 / 4 5 / 4 5 / # # 6 . ) . ) 2 6 3 & n & u & n & u + 4 5 / 4 5 / 6 34!.$"9 34"9 0'.$ $)!'./34)#3 34!3! ).054 ).054
demonstration board STA541SA 14/26 doc id 16988 rev 2 5 demonstration board figure 15. demonstration board schematic for tda7266sa for sta541 for sta 541 in1 in2 (tda7266sa) out1 out2 + c7 9 sgnd 10 diag 13 vcc 15 out2+ 14 out2- 1 out1+ 2 out1- 3 vcc 4 in1 12 in2 5 svr (STA541SA) 7 st by 8 p gnd 11 n.c. 6 mute (tda7266sa) ic1 STA541SA c1 220 nf + c5 470 uf 25 v j1 2 1 3 s1 2 1 3 s2 j2 j3 1 2 n4 1 2 n3 1 2 n2 2 4 1 3 n1 c2 220 nf c6 100 nf c4 10 uf 10 v c3 10 uf 10 v r1 10 k r2 10 k r3 10 k r4 6r8 c8 100 nf r5 6r8 c9 100 nf r6 6r8 c10 100 nf r7 6r8 c11 100 nf c12 100 p f c13 100 p f r8 1.5 k d1 5v1 5v 5v diag 5 v
STA541SA demonstration board doc id 16988 rev 2 15/26 figure 16. pcb layout silkscreen (top) bottom copper top copper
thermal information STA541SA 16/26 doc id 16988 rev 2 6 thermal information in order to avoid the premature onset of the thermal protection, see figure 6: electrical characteristics on page 9 , it is necessary to calculate the required thermal resistance, r th_hs , for the heatsink. the parameters that influence the calculation are: maximum power dissipated in the device (p dmax ) maximum thermal resistance junction to case (r th_j-case ) maximum ambient temperature t ambmax there is also an additional term that depends on the quiescent current, i q . 6.1 heatsink specification examples 6.1.1 r th_hs calculation given that v s = 17 v, r l = 2x 8 , p outmax = 2 x 20 w then the maximum power dissipated in the device is: p dmax = 2 * (2 * v s / ( 2 * r l )) = 2 * 7.32 = 14.6 w using this value the required thermal resistance of the heatsink can be determined: r th_hs = (150 - t ambmax ) / p dmax - r th_j-case = (150 - 70) / 14.6 - 2.5 = 3.0 c/w 6.1.2 calculations using music power the thermal resistance value calculated in the above example specifies a heatsink capable of sustaining the maximum dissipated power. r ealistically, however, and as explained in the applications note (an1965), the heatsink ca n be smaller when the application is musical content. when music power is considered the resulting dissipation is about 40% less than the calculated maximum. thus, a smaller or cheaper heatsink can be employed. using the values in the previous example, the maximum dissipated power reduces to: p dmax = 14.6 - 40% = 8.8 w leading to a heatsink thermal resistance of r th_hs = 6.6 c/w.
STA541SA practical information doc id 16988 rev 2 17/26 7 practical information 7.1 internally fixed gain the advantages in internally fixing the gain to 26 db are: components and space saving output noise, supply voltage rejection and distortion optimization. 7.2 silent turn on/off an d muting/standby function the standby mode can be easily activated by means of a cmos logic level applied to pin stby through a rc filter. in standby, the device is turned of, drawing typically 1 ma from the supply and the output attenuation is 80 db minimum. all switch-on and switch-off operations are virtually pop-free. furthermore, at turn-on the device stays muted for a time determined by the value of the capacitor on pin svr. this prevents transients coming from previous sta ges which otherwise coul d produce unpleasant acoustic effects at the speakers. 7.3 driving circuit for standby mode some precautions need to be taken when designing the driving circuit for pin 7, stby. for instance, the pin cannot be directly driven by a voltage source having a current capability higher than 5 ma. in practical cases a series resistor must be inserted, giving it the double purpose of limiting the current at pin 7 and to smooth down the standby on/off transitions. when done in combination with a capacitor it prevents output pop. a capacitor of at least 100 nf from pin 7 to sgnd is necessary to ensure correct turn-on (see also figure 14: applications circuit on page 13 ).
practical information STA541SA 18/26 doc id 16988 rev 2 7.4 built?in protection 7.4.1 diagnostic facilities (pin 10) the STA541SA is equipped with diagnostic circuitry that is able to detect the following events: clipping of the output signal thermal shutdown output fault: ? short circuit to ground ? short circuit to supply ? soft short circuit at turn-on the event is signalled when the open collector output of pin 10 (diag) begins to sink current. 7.4.2 short-circuit protection reliable and safe operation in the presence of all kinds of output short circuit is assured by the built-in protection. as well as the ac/dc short circuit to gnd and to v s , and across the speaker, there is a soft short-circuit condition which is signalled on pin diag during the turn-on phase to verify output circuit integrity in order to ensure correct amplifier operation. as mentioned previously, it is important to limit the external current driving pin stby to 5 ma, the reason being that the associated circuitry is normally disabled with currents greater than 5 ma. 7.4.3 clipping detection figure 17. clipping detection waveforms a gain-compression function is initiated whenever the amplifier is overdriven. when a certain distortion level is reached at each output, pin 10 starts to sink current. audio output signal clipping detector output current v o i clip time 0
STA541SA practical information doc id 16988 rev 2 19/26 7.4.4 thermal shutdown with the thermal shutdown feature the diagnostic s output on pin 10 signals the closeness of the junction temperature to the shutdown threshold. typically, current sinking at pin 10 starts approximately 10 c before the shutdown temperature is reached. figure 18. configuration of pin diag figure 19. fault waveforms on pin diag v pin10 vref r 10 STA541SA soft short out to vs short fault detection correct turn-on out to gnd short t t t stby pin voltage 2 v output waveform vpin10 check at turn-on (rest phase) short to gnd or to vs d05au1603mod
practical information STA541SA 20/26 doc id 16988 rev 2 7.5 handling the diagnostic information as different diagnostic information (clipping detection, output fault, approaching thermal shutdown) becomes available at pin 10 so the behavior of the signal at this pin changes. in order to discriminate the event the signal on pin 10 must be interpreted correctly. figure 20 shows a combination of events on the output waveform and the corresponding output on pin 10. these events could be diagnosed based on the ti ming of the output signal on pin 10. for example, the clip-detector sign alling under fault conditions c ould produce a low level for a short time. on the other hand, an output short circuit would probably produce a low level for a much longer time. with these assumptions, an interface circuit based on the one shown in figure 21 could differentiate the information and flag the appropriate circuits. figure 20. waveforms figure 21. interface circuit diagram t t t stby pin voltage vs output waveform vpin 10 waveform short to gnd or to vs d05au1604mod clipping thermal proximity vref vref1 vref2 r1 r2 clip detector (to gain compressor / tone control) fault, thermal shutdown (to power supply section, voltage regulator, flashing system) STA541SA r1 << r2 vref > vref1 >> vref2 10
STA541SA practical information doc id 16988 rev 2 21/26 7.6 pcb ground layout the device has two distinct ground pins, pgnd (power ground) and sgnd (signal ground) which are disconnected from each other at chip level. for superior performance the pins pgnd and sgnd must be connected together on the pcb by low-resistance tracks. for the pcb ground configuration, a star-like arrangement, where the center is represented by the supply-filtering electrolytic capacitor ground, is recommended. in an arrangement such as this at least two separate paths must be provided, one for pgnd and one for sgnd. the correct ground assignments are as follows: on sgnd: ? standby capacitor (pin 7, or any other standby driving networks) ? svr capacitor (pin 5), to be placed as close as possible to the device ? input signal ground (from active/p assive signal processor stages) on pgnd: ? power supply filtering capacitors for pins 3 and 13; the negative terminal of the electrolytic capacitor(s) must be directly tied to the battery negative line and this should represent the starting point for all the ground paths. 7.7 mute function if the mute function is desired, it can be implemented on pin 5, svr, as shown in figure 22 . figure 22. optional mute function circuit using a different value for r1 than the suggested 3.3 k , results in two different situations: r1 > 3.3 k : ? pop noise improvement ? lower mute attenuation r1 < 3.3 k : ? pop noise degradation ? higher mute attenuation diagnostics d06a u 0 . 47 f in bridge 12 470 f 6 15 14 8 9 10 11 r1 3.3k r2 10k mute 5v 0 play 5 8 9 v pin5 > 0.6 v: mute off v pin5 < 0.2 v: mute on STA541SA
package mechanical data STA541SA 22/26 doc id 16988 rev 2 8 package mechanical data the STA541SA is housed in a clipwatt 15-lead split vertical package. figure 23 shows the package outline and ta b l e 7 gives the dimensions. figure 23. package outline
STA541SA package mechanical data doc id 16988 rev 2 23/26 in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. table 7. package dimensions reference dimensions in mm dimensions in inches notes min typ max min typ max a --3.2--0.126- b --1.05--0.041- c -0.15--0.006-- d - 1.5 - - 0.059 - - e 0.49 - 0.55 0.019 - 0.021 - f 0.65 - 0.73 0.026 - 0.029 - f1 --0.1--0.004 (1) g 1.14 1.27 1.40 0.045 0.050 0.055 - g1 17.57 17.78 17.91 0.692 0.700 0.705 - h1 -12--0.472-- h2 - 18.6 - - 0.732 - - h3 19.85 - - 0.781 - - (2) l - 17.9 - - 0.705 - - l1 - 14.55 - - 0.573 - - l2 10.70 11.00 11.20 0.421 0.433 0.441 (2) l3 - 5.5 - - 0.217 - - m -2.54--0.1-- m1 -2.54--0.1-- r -1.50--0.059-- r1 -3.30--0.130-- r2 -0.30--0.012-- r3 -0.50--0.019-- s -0.70--0.028-- v - 10 deg - - 10 deg - -
package mechanical data STA541SA 24/26 doc id 16988 rev 2 v1 -5 deg--5 deg-- v2 - 75 deg - - 75 deg - - 1. no intrusion allowed inwards the leads 2. h3 and l2 do not include mold flash or protrusions. mo ld flash or protrusions shall not exceed 0.15 mm per side table 7. package dimensions (continued) reference dimensions in mm dimensions in inches notes min typ max min typ max
STA541SA revision history doc id 16988 rev 2 25/26 9 revision history table 8. document revision history date revision changes 27-jan-2010 1 initial release. 02-apr-2012 2 updated document status from preliminary to full production data modifed v stby to v sb and updated parameters in ta b l e 6
STA541SA 26/26 doc id 16988 rev 2 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by two authorized st representatives, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2012 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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