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this is information on a product in full production. july 2015 docid027887 rev 2 1/29 STPA008 4 x 50 w mosfet quad bridge power amplifier datasheet - production data features ? high output power capability: ? 4 x 50 w/4 max. ? 4 x 28 w/4 @ 14.4 v, 1 khz, 10 % ? 4 x 72 w/2 max. ? mosfet output power stage ? 2 driving capability ? capable to operate down to 6 v (suitable for start-stop car operation) ? excellent gsm noise immunity ? hi-fi class distortion ? low output noise ? high immunity to rf noise injection ? standby function ? mute function ? automute at min. supply voltage detection ? low external component count ? internally fixed gain (26 db) ? protections: ? output short circuit to gnd, to v s , across the load ? very inductive loads ? overrating chip temperature with soft thermal limiter ? output dc offset detection ? load dump ? fortuitous open gnd ? reversed battery ? esd ? qualification in accordance to aec q100 standard description STPA008 is a breakthrough mosfet technology class ab audio power amplifier designed for high power car radio. the fully complementary p-channel/n-channel output structure allows a rail to rail output voltage swing which, combined with high output current and minimized saturation losses sets new power references in the car-radio field, with unparalleled distortion performances. STPA008 can operate down to 6v and this makes the ic compliant to the most recent oem specifications for low voltage operation (so called 'start-stop' battery profile during engine stop), helping car manufacturers to reduce the overall emissions and thus contributing to environment protection. )oh[lzdww )oh[lzdww yhuwlfdo )oh[lzdww krul]rqwdo *$3*36 table 1. device summary order code package packing STPA008-4wx flexiwatt25 (vertical) tube STPA008-qix flexiwatt25 (horizontal) tube STPA008-48x flexiwatt27 tube www.st.com
contents STPA008 2/29 docid027887 rev 2 contents 1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1 block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.4 electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 general information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.1 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.2 battery variations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.2.1 low voltage operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.2.2 cranks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.2.3 advanced battery management (hybrid vehicles) . . . . . . . . . . . . . . . . . 18 4.3 protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.3.1 short circuits and open load operation . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.3.2 over-voltage and load dump protection . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.3.3 thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.4 warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4.1 dc offset detection (od pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4.2 clipping detection and diagnostics (cd-diag pin) . . . . . . . . . . . . . . . . 20 4.5 heat sink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 5.1 flexiwatt 27 (vertical) package information . . . . . . . . . . . . . . . . . . . . . . . 22 5.2 flexiwatt 25 (vertical) package information . . . . . . . . . . . . . . . . . . . . . . . 24 5.3 flexiwatt 25 (horizontal) package information . . . . . . . . . . . . . . . . . . . . . 26
docid027887 rev 2 3/29 STPA008 contents 3 6 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
list of tables STPA008 4/29 docid027887 rev 2 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 3. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 4. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 5. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 6. flexiwatt 27 (vertical) package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 table 7. flexiwatt 25 (vertical) package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 table 8. flexiwatt 25 (horizontal) package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 table 9. document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
docid027887 rev 2 5/29 STPA008 list of figures 5 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 2. application circuit (STPA008-4wx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 figure 3. application circuit (STPA008-48x) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 4. pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 5. quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 6. output power vs. supply voltage (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 7. output power vs. supply voltage (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 8. distortion vs. output power (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 9. distortion vs. output power (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 10. distortion vs. frequency (4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 11. distortion vs. frequency (2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 12. distortion vs. output power (4 , v s = 6 v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 13. distortion vs. output power (2 , v s = 6 v) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 14. supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 15. crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 16. total power dissipation & efficiency vs. p o (4 , sine) . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 17. power dissipation vs. average output power (4 , audio program simulation) . . . . . . . . . 15 figure 18. power dissipation vs. average output power (2 , audio program simulation) . . . . . . . . . 15 figure 19. itu r-arm frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 15 figure 20. svr charge diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 21. battery cranking curve example 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 figure 22. battery cranking curve example 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 figure 23. upwards fast battery transitions diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 8 figure 24. load dump protection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 figure 25. thermal protection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 26. audio section waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 27. flexiwatt 27 (vertical) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 figure 28. flexiwatt 25 (vertical) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 figure 29. flexiwatt 25 (horizontal) package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
overview STPA008 6/29 docid027887 rev 2 1 overview STPA008 is a complementary quad audio power amplifier. it is available in two different packages, flexiwatt25 and flexiwatt27. it embeds four independent amplifiers working in class ab, a standby and a mute pin, an offset detector and, only for the flexiwatt27 package, a clipping detector and diagnostics output. the amplifier is fully operational down to a battery voltage of 6 v, without producing pop noise and continuing to play during battery transitions. STPA008 can drive 2 ohm loads and has a very high immunity to disturbs without need of external components or compensation. it is protected against any kind of short or open circuit, over-voltage and over-temperature. 1.1 block diagram and application circuit figure 1. block diagram ). -54% 34 "9 ). /54 /54 /54 /54 07 '.$ ). ). /54 /54 /54 /54 07 '.$ 07 '.$ 07 '.$ !# '.$ 362 4!" 3 '.$ 6cc 6cc #$ $)!'
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docid027887 rev 2 7/29 STPA008 overview 28 figure 2. application circuit (STPA008-4wx) figure 3. application circuit (STPA008-48x) 695 *$3*36 & 087( . 5 . 5 67%< & ,1 & ,1 & ,1 ?) ?) ?) ?) ,1 9%$7 673 6*1' & ?) & $&*1' & ?) ?) ?) & $:; 9 5 . '(7(&725287 2))6(7 ?) & 9ff 9ff 287 287 287 7$% 287 ?) & 673$:; & ?) & ?) 695 $&*1' 6*1' &'287 . 5 9 . 5 9 $; *$3*36 9%$7 673 67%< 087( ,1 ,1 ,1 ,1 & . 5 . 5 ?) & ?) & &?) &?) &?) ?) & ?) '(7(&725287 2))6(7 ?) & 9ff 7$% 9ff 287 287 287 287
pin description STPA008 8/29 docid027887 rev 2 2 pin description 2.1 pin connection figure 4. pin connection (top view ) '!0'03 /$ 4! " 07 '.$ /54 34 "9 /54 6 ## /54 07 '.$ /54 362 ). ). 3 '.$ ). ). !# '.$ /54 07 '.$ /54 6 ## /54 -54% /54 07 '.$ #$ $)!' 4! " &lexiwatt &lexiwatt 4! " 07 '.$ /54 34 "9 /54 6 ## /54 07 '.$ /54 362 ). ). 3 '.$ ). ). !# '.$ /54 07 '.$ /54 6 ## /54 -54% /54 07 '.$ /$
docid027887 rev 2 9/29 STPA008 pin description 28 2.2 pin functions table 2. pin functions pin number fw27 pin number fw25 pin name description 1 1 tab device slug connection 2 25 od offset detector output 3 2 pw-gnd2 channel 2, power ground 4 3 out2- channel 2, negative output 5 4 st-by stand-by 6 5 out2+ channel 2, positive output 7 6 vcc supply voltage 8 7 out1- channel 1, negative output 9 8 pw-gnd1 channel 1, power ground 10 9 out1+ channel 1, positive output 11 10 svr supply voltage rejection pin 12 11 in1 channel 1, input 13 12 in2 channel 2, input 14 13 s-gnd signal ground 15 14 in4 channel 4, input 16 15 in3 channel 3, input 17 16 ac-gnd ac ground 18 17 out3+ channel 3, positive output 19 18 pw-gnd3 channel 3, power ground 20 19 out3- channel 3, negative output 21 20 vcc supply voltage 22 21 out4+ channel 4, positive output 23 22 mute mute pin 24 23 out4- channel 4, negative output 25 24 pw-gnd4 channel 4, power ground 26 n.a cd-diag clipping detector and diagnostics output 27 n.a tab device slug connection
electrical specifications STPA008 10/29 docid027887 rev 2 3 electrical specifications 3.1 absolute maximum ratings 3.2 thermal data table 3. absolute maximum ratings symbol parameter value unit v s operating supply voltage 18 v v s (dc) dc supply voltage 28 v v s (pk) peak supply voltage (for t = 50 ms) 50 v i o output peak current non repetitive (t = 100 s) repetitive (duty cycle 10 % at f = 10 hz) 10 9 a a p tot power dissipation t case = 70 c 85 w t j junction temperature 150 c t stg storage temperature -55 to 150 c gnd max ground pins voltage -0.3 to 0.3 v v in max input pin max voltage -0.3 to 8 v v sb max st-by pin max voltage -0.3 to v s (pk) v v mute max mute pin max voltage -0.3 to 6 v table 4. thermal data symbol parameter value unit r th j-case thermal resistance junction-to-case max 1 c/w
docid027887 rev 2 11/29 STPA008 electrical specifications 28 3.3 electrical characteristics refer to the test and application diagram, v s = 14.4 v; r l = 4 ; r g = 600 ; f = 1 khz; t amb = 25 c; unless otherwise specified. table 5. electrical characteristics symbol parameter test condition min. typ. max. unit general characteristics v s supply voltage range - 6 - 18 v i q1 quiescent current r l = 100 190 280 ma v os output offset voltage play mode -90 - +90 mv mute mode -70 - +70 mv dv os during standby on/off output transient voltage itu r-arm weighted (see figure 19 ) -7.5 - +7.5 mv during mute on/off output transient voltage -7.5 - +7.5 mv r i input impedance - 45 55 65 k i sb standby current consumption v st-b y = 1 v - - 2 a v st-b y = 0 - - 1 a audio performances p o output power thd = 10 % thd = 1 % 26 20 29 23 - - w w thd = 10 %, 2 thd = 1 %, 2 45 37 50 40 - - w w p o max. max. output power square wave input (2 vrms) r l = 4 r l = 2 v s = 15.2 v; r l = 4 ? 42 71 47 45 77 50 - - - w w w thd distortion p o = 4 w, 30khz lpf - 0.01 0.02 % g v voltage gain - 25 26 27 db dg v channel gain unbalance - -0.5 - +0.5 db e no output noise "a" weighted bw = 20 hz to 20 khz - - 40 50 - 70 v v svr supply voltage rejection f = 100 khz; v r = 1 vrms, play mode 60 70 - db f ch high cut-off frequency p o = 0.5 w 100 300 - khz c t cross talk f = 1 khz p o = 4 w f = 10 khz p o = 4 w 65 50 75 60 - - db db a m mute attenuation p oref = 4 w 90 100 - db
electrical specifications STPA008 12/29 docid027887 rev 2 control pin characteristics i pin5 standby pin current v st-b y = 1 v to 2.2 v - - 0.5 a v sb out standby out threshold voltage (amp: on) 2.2 - - v v sb in standby in threshold voltage (amp: off) - - 1 v v m out mute out threshold voltage (amp: play) 2.2 - - v v m in mute in threshold voltage (amp: mute) - - 0.8 v v am in v s automute threshold attenuation = 6 db; p oref = 4 w 4.5 5 5.5 v ipin23 muting pin current v mute = 0.8 v (sourced current) 5812 a offset detector v off detected differential output offset - 1.3 2 2.7 v v off_sat off detector saturation voltage v o > v off max , i off det = 1 ma 0 v < v off det < 18 v - 0.1 0.2 v v off_lk off detector leakage current v o < 1 v - 0 15 a clipping detector cd lk clip detector high leakage current cd off - 0 1 a cd sat clip detector saturation voltage cd on; i cd = 1 ma - 0.1 0.2 v cd thd clip detector thd level - - 2 3 % table 5. electrical characteristics (continued) symbol parameter test condition min. typ. max. unit
docid027887 rev 2 13/29 STPA008 electrical specifications 28 3.4 electrical characteristics curves figure 5. quiescent current vs. supply voltage figure 6. output power vs. supply voltage (4 ) *$3*36 ,tp$ 5/ 9lq 9v9 *$3*36 i .+] 5/ ? 3r: 3rpd[ 7+' 7+' 9v9 figure 7. output power vs. supply voltage (2 ) figure 8. distortion vs. output power (4 ) *$3*36 i .+] 5/ ? 3r: 9v9 3rpd[ 7+' 7+' *$3*36 5/ ? 9v 9 7+' i .+] i .+] 3r: figure 9. distortion vs. output power (2 ) figure 10. distortion vs. frequency (4 ) *$3*36 i .+] i .+] 5/ ? 9v 9 3r: 7+' *$3*36 3r : 5/ ? 9v 9 i+] 7+'
electrical specifications STPA008 14/29 docid027887 rev 2 figure 11. distortion vs. frequency (2 ) figure 12. distortion vs. output power (4 , v s = 6 v) *$3*36 3r : 5/ ? 9v 9 i+] 7+' *$3*36 i .+] i .+] 5/ ? 9v 9 3r: 7+' figure 13. distortion vs. output power (2 , v s = 6 v) figure 14. supply voltage rejection vs. frequency *$3*36 i .+] i .+] 5/ ? 9v 9 3r: 7+' *$3*36 5j ? 9ulssoh 9upv i+] 695g% figure 15. crosstalk vs. frequency figure 16. total power dissipation & efficiency vs. p o (4 , sine) *$3*36 5/ ? 3r : 5j ? &52667$/.g% i+] *$3*36 i .+] 5/ [ 9v 9 3glvv: 3r: 3glvv
docid027887 rev 2 15/29 STPA008 electrical specifications 28 figure 17. power dissipation vs. average output power (4 , audio program simulation) figure 18. power dissipation vs. average output power (2 , audio program simulation) *$3*36 &/,367$57 *$866,$112,6( 5/ [ 9v 9 3rdyj: 3glvv: *$3*36 &/,367$57 *$866,$112,6( 5/ [ 9v 9 3rdyj: 3glvv: figure 19. itu r-arm frequency response, weighting filter for transient pop /utputattenuationd" (z '!0'03
general information STPA008 16/29 docid027887 rev 2 4 general information 4.1 operation STPA008's inputs are ground-compatible. if the standard value for the input capacitors (0.22 f) is adopted, the low frequency cut-off is 16 hz. the input capacitors should be 1/4 of the capacitor connected to ac-gnd pin for optimum pop performances (see figure 2: application circuit (STPA008-4wx) ). standby and mute pins are both 3.3 v cmos compatible. rc cells at both mute and stand-by pins have always to be used in order to smooth the transitions for preventing any audible transient noise. in case the stand-by function is not used, it could steadily be connected to v s , but a 470 kohm resistance should be present between the power supply and the pin. the capacitance on svr sets the start-up and shut-down times and helps to have pop-noise free transitions. its minimum recommended value is 10 f. to have a fast start-up time, the internal resistor on svr pin, used to set the time constant, is reduced from 50 k to 3 k till voltage on svr reaches vcc/4 -2v be and then released. in this way the capacitor on svr is charged very quickly to vcc/4, as shown in the following figure. the time constant to be assigned to the standby pin in order to obtain a virtually pop-free transition has to be slower than 2.5 v/ms. figure 20. svr charge diagram svr pin accomplishes multiple functions: ? it is used as a reference voltage for input pins (vcc/4) ? the capacitor connected to svr improves the supply voltage ripple rejection ? it is used as a reference to generate the v cc /2 reference for the outputs when the amplifier goes in standby mode or goes out from this condition, it is recommended to put the amplifier in mute to ensure the absence of audible noise. then the stand-by pin can be set to the appropriate value (ground or > 2.6 v) and the capacitor on svr pin is discharged or charged consequently. 4.2 battery variations 4.2.1 low voltage operation the most recent oem specifications require automatic stop of car engine at traffic lights, in order to reduce emissions of polluting substances. STPA008, thanks to its innovating '!0'03 6 ## n 6 "% 6 ## 4ime
docid027887 rev 2 17/29 STPA008 general information 28 design, allows a continuous operation when battery falls down. at 6 v it is still fully operational, only the maximum output power is reduced according to the available voltage supply. if the battery voltage drops below the minimum operating voltage of 6v the amplifier is fast muted, the capacitor on svr is discharged and the amplifier restarts when the battery voltage returns to the correct voltage. 4.2.2 cranks STPA008 can sustain worst case cranks from 16 v to 6 v, continuing to play and without producing any pop noise. examples of battery cranking curves are shown below, indicating the shape and duration of allowed battery transitions. figure 21. battery cranking curve example 1 v1 = 16 v; v2 = 6 v; v3 = 7 v; v4 = 8 v t1 = 2 ms; t2 = 50 ms; t3 = 5 ms; t4 = 300 ms; t5 =10 ms; t6 = 1 s; t7 = 2 ms figure 22. battery cranking curve example 2 v1 = 16 v; v2 = 6 v; v3 = 7 v t1 = 2 ms; t2 = 5 ms; t3 = 15 ms; t5 = 1 s; t6 = 50 ms *$3*36 9 9 9 9 9 w w w w w w w 9 edww wv *$3*36 9 9 wv 9 9 9 w w w w w edww
general information STPA008 18/29 docid027887 rev 2 4.2.3 advanced battery management (hybrid vehicles) in hybrid vehicles, the engine ignition causes a fast increase of battery voltage which can reach 16 v in less than 10 ms. in addition to compatibility with low vbatt, STPA008 is able to sustain upwards fast battery transitions without causing unwanted audible effects, like pop noise, and without any sound interruption thanks to the innovative circuit topology. figure 23. upwards fast battery transitions diagram '!0'03
docid027887 rev 2 19/29 STPA008 general information 28 4.3 protections 4.3.1 short circuits and open load operation when the ic detects a short circuit to ground, to vbatt or across the load, the output of the amplifier is put in three-state (high impedance condition). in case of short circuit to ground or vcc, the amplifier exits from the three-state condition only when the short-circuit is released and the output returns inside the limits imposed by an internal voltage comparator. when a short across the load is present, the power stage sees an over-current and is brought in protection mode for about 100 s. after this time, if the short circuit condition is removed the amplifier returns to play, otherwise the high impedance state is maintained and the check is repeated every 100 s. disconnection of load (open load condition) doesn't affect the amplifier, which continues to play. 4.3.2 over-voltage and load dump protection when the battery voltage is higher than 19 v, the amplifier put in tri-state. it stops playing till the supply voltage returns in the permitted range. the amplifier is protected against load dump surges having amplitude as high as 50 v and a rising time as low as 2 ms (see figure 24 ). figure 24. load dump protection diagram 4.3.3 thermal protection if the junction temperature of the ic overcomes t j = 150 c, a smooth mute is applied to reduce output power and limit power dissipation. if this is not enough and the junction temperature continues to increase, the amplifier is switched off when it reaches the maximum temperature of 170 c. figure 25. thermal protection diagram 66dump 66cc ms ms '!0'03 /utputpower *unctiontemperature # # # '!0'03
general information STPA008 20/29 docid027887 rev 2 4.4 warnings 4.4.1 dc offset detection (od pin) STPA008 integrates a dc offset detector to avoid that an anomalous input dc offset is multiplied by the amplifier gain producing a dangerous large offset at the output. in fact an output offset may lead to speakers damage for overheating. the detector works with the amplifier un-muted and no signal at the inputs. when the differential output voltage is out of a window comparator with thresholds 2v (typ), the od pin is pulled down. 4.4.2 clipping detection and diagnostics (cd-diag pin) when clipping occurs, the output signal is distorted. if the signal distortion on one of the output channels exceeds 1%, the cd-diag pin is pulled down. this information can be sent to an audio processor in order to reduce the input signal of the amplifier and reduce the clipping. a short to ground and short to vcc is pointed out by cd-diag. this pin is pulled down to 0 v till these shorts are present to inform the user a protection occurred. cd-diag acts also as thermal warning. in fact every time t j exceeds 140 c, it is pulled down to notify this occurrence. figure 26. audio section waveforms t t t -54%0). 6/,4!'% 6s /54054 7!6%&/2- $)!'pin 7!6%&/2- 3(/244/'.$ /24/6s #,)00).' 4(%2-!, 02/8)-)49 34 "90). 6/,4!'% t '!0'03
docid027887 rev 2 21/29 STPA008 general information 28 4.5 heat sink definition assuming a power dissipation of 26 w (e.g. in the worst case situation of frequent clipping occurrence), considering t j max is 150c and assuming ambient temperature is 70 c, the available temperature gap for a correct dissipation is 80 c. this means the thermal resistance of the system r th has to be 80 c/26 w = 3 c/w. the junction to case thermal resistance is 1 c/w. so the heat sink thermal resistance should be approximately 2 c/w. this would avoid any thermal shutdown occurrence even after long-term and full-volume operation.
package information STPA008 22/29 docid027887 rev 2 5 package information 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. 5.1 flexiwatt 27 (vertical) package information figure 27. flexiwatt 27 (vertical) package outline table 6. flexiwatt 27 (vertical) package mechanical data ref dimensions millimeters inches (1) min. typ. max. min. typ. max. a 4.45 4.50 4.65 0.1752 0.1772 0.1831 b 1.80 1.90 2.00 0.0709 0.0748 0.0787 c - 1.40 - - 0.0551 - d 0.75 0.90 1.05 0.0295 0.0354 0.0413 b)b ( 2 ' 6 6 ' , ( ( & - , 6 / , , ( 2 . 6 2 2 2 # " , - 2 , 2 2 % $ ! 6 6 0in *$3*36
docid027887 rev 2 23/29 STPA008 package information 28 e 0.37 0.39 0.42 0.0146 0.0154 0.0165 f (2) - - 0.57 - - 0.0224 g 0.80 1.00 1.20 0.0315 0.0394 0.0472 g1 25.75 26.00 26.25 1.0138 1.0236 1.0335 h (3) 28.90 29.23 29.30 1.1378 1.1508 1.1535 h1 - 17.00 - - 0.6693 - h2 - 12.80 - - 0.5039 - h3 - 0.80 - - 0.0315 - l (3) 22.07 22.47 22.87 0.8689 0.8846 0.9004 l1 18.57 18.97 19.37 0.7311 0.7469 0.7626 l2 (3) 15.50 15.70 15.90 0.6102 0.6181 0.6260 l3 7.70 7.85 7.95 0.3031 0.3091 0.3130 l4 - 5 - - 0.1969 - l5 3.35 3.5 3.65 0.1319 0.1378 0.1437 m 3.70 4.00 4.30 0.1457 0.1575 0.1693 m1 3.60 4.00 4.40 0.1417 0.1575 0.1732 n - 2.20 - - 0.0866 - o - 2 - - 0.0787 - r - 1.70 - - 0.0669 - r1 - 0.5 - - 0.0197 - r2 - 0.3 - - 0.0118 - r3 - 1.25 - - 0.0492 - r4 - 0.50 - - 0.0197 - v5 5 v1 3 3 v2 20 20 v3 45 45 1. values in inches are converted from mm and rounded to 4 decimal digits. 2. dam-bar protusion not included. 3. molding protusion included. table 6. flexiwatt 27 (vertical) package mechanical data (continued) ref dimensions millimeters inches (1) min. typ. max. min. typ. max.
package information STPA008 24/29 docid027887 rev 2 5.2 flexiwatt 25 (vertical) package information figure 28. flexiwatt 25 (vertical) package outline table 7. flexiwatt 25 (vertical) package mechanical data ref dimensions millimeters inches (1) min. typ. max. min. typ. max. a 4.45 4.50 4.65 0.1752 0.1772 0.1831 b 1.80 1.90 2.00 0.0709 0.0748 0.0787 c - 1.40 - - 0.0551 - d 0.75 0.90 1.05 0.0295 0.0354 0.0413 e 0.37 0.39 0.42 0.0146 0.0154 0.0165 f (2) - - 0.570 - - 0.0224 g 0.80 1.00 1.20 0.0315 0.0394 0.0472 g1 23.75 24.00 24.25 0.9350 0.9449 0.9547 h (3) 28.90 29.23 29.30 1.1378 1.1508 1.1535 h1 - 17.00 - - 0.6693 - h2 - 12.80 - - 0.5039 - h3 - 0.80 - - 0.0315 - b)b: *$3*36 + 5 * 9 * / + + ) 0 / 9 2 / / + 5 1 9 5 5 5 & % / 0 5 / 5 5 ( ' $ 3lq 9 9 9
docid027887 rev 2 25/29 STPA008 package information 28 l (3) 22.07 22.47 22.87 0.8689 0.8846 0.9004 l1 18.57 18.97 19.37 0.7311 0.7469 0.7626 l2 (3) 15.50 15.70 15.90 0.6102 0.6181 0.6260 l3 7.70 7.85 7.95 0.3031 0.3091 0.3130 l4 - 5.00 - - 0.1969 - l5 3.35 3.50 3.65 0.1319 0.1378 0.1437 m 3.70 4.00 4.30 0.1457 0.1575 0.1693 m1 3.60 4.00 4.40 0.1417 0.1575 0.1732 n - 2.20 - - 0.0866 - o - 2.00 - - 0.0787 - r - 1.70 - - 0.0669 - r1 - 0.50 - - 0.0197 - r2 - 0.30 - - 0.0118 - r3 - 1.25 - - 0.0492 - r4 - 0.50 - - 0.0197 - v5 5 v1 3 3 v2 20 20 v3 45 45 1. values in inches are converted from mm and rounded to 4 decimal digits. 2. dam-bar protusion not included. 3. molding protusion included. table 7. flexiwatt 25 (vertical) package mechanical data (continued) ref dimensions millimeters inches (1) min. typ. max. min. typ. max.
package information STPA008 26/29 docid027887 rev 2 5.3 flexiwatt 25 (horizontal) package information figure 29. flexiwatt 25 (horizontal) package outline table 8. flexiwatt 25 (horizontal) package mechanical data ref dimensions millimeters inches (1) min. typ. max. min. typ. max. a 4.45 4.50 4.65 0.1752 0.1772 0.1831 b 1.80 1.90 2.00 0.0709 0.0748 0.0787 c - 1.40 - - 0.0551 - d - 2.00 - - 0.0787 - e 0.37 0.39 0.42 0.0146 0.0154 0.0165 f (2) - - 0.57 - - 0.0224 g 0.75 1.00 1.25 0.0295 0.0394 0.0492 g1 23.70 24.00 24.30 0.9331 0.9449 0.9567 h (3) 28.90 29.23 29.30 1.1378 1.1508 1.1535 h1 - 17.00 - - 0.6693 - h2 - 12.80 - - 0.5039 - h3 - 0.80 - - 0.0315 - l 21.64 22.04 22.44 0.8520 0.8677 0.8835 b'b4, 9 9 + + + 9 & + 5 5 1 5 % ' / / / * ) / / / / 3 ( 9 9 0 $ 0 0 5 5 5 * 9 *$3*36
docid027887 rev 2 27/29 STPA008 package information 28 l1 10.15 10.5 10.85 0.3996 0.4134 0.4272 l2 (3) 15.50 15.70 15.90 0.6102 0.6181 0.6260 l3 7.70 7.85 7.95 0.3031 0.3091 0.3130 l4 - 5 - - 0.1969 - l5 5.15 5.45 5.85 0.2028 0.2146 0.2303 l6 1.80 1.95 2.10 0.0709 0.0768 0.0827 m 2.75 3.00 3.50 0.1083 0.1181 0.1378 m1 - 4.73 - - 0.1862 - m2 - 5.61 - - 0.2209 - n - 2.20 - - 0.0866 - p 3.20 3.50 3.80 0.1260 0.1378 0.1496 r - 1.70 - - 0.0669 - r1 - 0.50 - - 0.0197 - r2 - 0.30 - - 0.0118 - r3 - 1.25 - - 0.0492 - r4 - 0.50 - - 0.0197 - v5 5 v1 3 3 v2 20 20 v3 45 45 1. values in inches are converted from mm and rounded to 4 decimal digits. 2. dam-bar protusion not included. 3. molding protusion included. table 8. flexiwatt 25 (horizontal) package mechanical data (continued) ref dimensions millimeters inches (1) min. typ. max. min. typ. max.
revision history STPA008 28/29 docid027887 rev 2 6 revision history table 9. document revision history date revision changes 18-may-2015 1 initial release. 27-jul-2015 2 updated: table 1: device summary on page 1 ; table 4: thermal data on page 10 ; section 4: general information ; section 5: package information .
docid027887 rev 2 29/29 STPA008 29 important notice ? please read carefully stmicroelectronics nv and its subsidiaries (?st?) reserve the right to make changes, corrections, enhancements, modifications, and improvements to st products and/or to this document at any time without notice. purchasers should obtain the latest relevant in formation on st products before placing orders. st products are sold pursuant to st?s terms and conditions of sale in place at the time of o rder acknowledgement. purchasers are solely responsible for the choice, selection, and use of st products and st assumes no liability for application assistance or the design of purchasers? products. no license, express or implied, to any intellectual property right is granted by st herein. resale of st products with provisions different from the information set forth herein shall void any warranty granted by st for such product. st and the st logo are trademarks of st. all other product or service names are the property of their respective owners. information in this document supersedes and replaces information previously supplied in any prior versions of this document. ? 2015 stmicroelectronics ? all rights reserved

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