ST TDA7851A 4 x 48 W MOSFET quad bridge power amplifier handbook
Contents
1. Figure 4 Quiescent current vs supply Figure 5 Output power vs supply voltage voltage RL 40 P W 80 75 T R 42 Po max 65 E 60 f 1 KHz 55 50 22 THD 10 40 35 30 25 20 THD 1 15 10 5 8 10 12 14 16 18 8 9 10 11 12 13 14 15 16 17 18 Vs V GAPGPS01689 NS GAPGPS01690 Figure 6 Output power vs supply voltage Figure 7 Distortion vs output power RL 20 Ru 4Q Po W THD 130 10 120 Po max Vs 14 4 V 110 R 20 S AO 100 fei KHz 4 Fs 4n 90 80 f 10 kH 70 THD 10 S 60 0 1 50 40 THD 1 f 1 kHz 30 0 01 20 10 M 0 001 8 10 11 12 13 14 15 16 17 18 0 1 1 10 100 Vs V GAPGPS01691 Pa IM GAPGPS01692 Figure 8 Distortion vs output power Figure 9 Distortion vs frequency Rx 22 Q Ry 24 Q THD e 10 10 HO 4 V 14 4V R 2Q f 10 KHz 0 1 f 1 KHz 0 01 0 001 Kg p 15 00 10 100 1000 10000 100000 Po W GAPGPS01693 f Hz GAPGPS01694 ky Doc ID 17715 Rev 2 9 15 Electrical specifications TDA7851A F2. 1 pA Vsgou Standby out threshold voltage Amp ON 2 6 V Vspin Standby in threshold voltage Amp OFF 1 2 V Am Mute attenuation Poret 4 W 80 90 dB Vu out Mute out threshold voltage Amp Play 2 6 VM in Mute in threshold voltage Amp Mute 1 2 V Amp Mute Att gt 80 dB Pores 4 W 6 7 7 V VaMin Vs automute threshold Amp Play Att lt 0 1 dB Py 0 5 W 7 5 8 V V 1 2V te 7 12 18 pA Ipin23 Muting pin current Sourced current VMUTE 2 6V 5 4 18 pA Offset detector Vorr Detected differential output offset Vgtpy 5 V 1 2 3 V Vo gt 3 V 1mA V Off detector saturation voltage 9 Gf Diet 02 04 V OFF SAT 0 V lt Vor pet lt 18 V Vorr u Off detector leakage current Vo 1 V 0 15 pA Clipping detector CD x Clip detector high leakage current Cd off 0 1 pA CDsar Clip detector saturation voltage DC On lcp 1 mA 0 2 0 4 V CDen Clip detector THD level 2 1 Saturated square wave output 8 15 Doc ID 17715 Rev 2 d TDA7851A Electrical specifications 3 3 Electrical characteristics curves
3. ky TDA7851A 4 x 48 W MOSFET quad bridge power amplifier Datasheet production data Features Multipower BCD technology m High output power capability 4x 48 W 4 O Max 4x28 W 4 O 14 4 V 1 kHz 10 4x72 W 2 Q Max MOSFET output power stage Excellent 2 driving capability ke 27 8 Hi Fi class distortion Low output noise Standby function Mute function Fortuitous open GND Reversed battery ESD Automute at min supply voltage detection Low external component count Internally fixed gain 26 dB No external compensation Description No bootstrap capacitors The TDA7851A is a breakthrough MOSFET technology class AB audio power amplifier designed for high power car radio m Protections Output short circuit to GND to Vs across the load Very inductive loads The fully complementary P Channel N Channel output structure allows a rail to rail output voltage swing This combined with high output current and minimized saturation losses sets new power references in the car radio field with unparalleled Overrating chip temperature with soft thermal limiter Output DC offset detection Load dump voltage distortion performance Table 1 Device summary Order code Package Packing June 2012 Doc ID 17715 Rev 2 1 15 This is information on a product in full production www st com Contents TDA7851A Contents 1 Block diag
4. Assuming Tamp 70 C and Topp 150 C as boundary conditions the heatsink s thermal resistance should be approximately 2 C W This would avoid any thermal shutdown occurrence even after long term and full volume operation Doc ID 17715 Rev 2 ky TDA7851A Package information 5 Y 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 Figure 19 Flexiwatt27 mechanical data and package dimensions 1 dam bar protusion not included 2 molding protusion included DIM CDD CREE ae A 445 450 465 0 175 0 177 0 183 OUTLINE AND B 1 80 1 90 2 00 0 070 0 074 0 079 MECHANICAL DATA C 1 40 0 055 D 0 75 0 90 1 05 0 029 0 035 0 041 E 0 37 0 39 0 42 0 014 0 015 0 016 FO 0 57 0 022 G 0 80 1 00 1 20 0 031 0 040 0 047 G1 2575 26 00 26 25 1 014 1 023 1 033 H 28 90 29 23 29 30 1 139 1 150 1 153 H1 17 00 0 669 H2 12 80 0 503 H3 0 80 0 031 LO 22 07 22 47 22 87 0 869 0 884 0 904 L1 18 57 18 97 19 37 0 731 0 747 0 762 L2 9 15 50 15
5. 0 40 P 60 tet 30 40 20 20 10 0 0 0 5 10 15 25 30 35 40 45 50 P W GAPGPS01700 10 15 Doc ID 17715 Rev 2 ky TDA7851A Electrical specifications Figure 16 Power dissipation vs output power RL 4 O audio program simulation Figure 17 Power dissipation vs output power RL 2 O audio program simulation 6 30 P W V 144 V R 4x4Q 25 GAUSSIAN NOISE CLIP START 20 15 10 5 0 1 2 3 4 5 P W o W GAPGPS01701 10 GAPGPS01702 Figure 18 ITU R ARM frequency response weighting filter for transient pop Output attenuation dB 100 10000 GAPGPS01703 100000 d Doc ID 17715 Rev 2 11 15 Application hints TDA7851A 4 4 1 4 2 4 3 4 4 4 5 12 15 Application hints DC offset detector The TDA7851A integrates a DC offset detector to avoid that an anomalous DC offset on the inputs of the amplifier may be multiplied by the gain and result in a dangerous large offset on the outputs which may lead to speakers damage for overheating The feature works with the amplifier unmuted and no signal at the inputs SVR Besides its contribution to the ripple rejection the SVR capacitor governs the turn ON OFF t
6. 70 15 90 0 610 0 618 0 626 LG 770 7 85 7 95 0 303 0 309 0 313 L4 5 0 197 L5 3 5 0 138 M 3 70 4 00 430 0 145 0 157 0 169 Mi 3 60 4 00 4 40 0 142 0 157 0 173 N 2 20 0 086 O 2 0 079 R 1 70 0 067 R1 0 5 0 02 R2 0 3 0 12 R3 1 25 0 049 R4 0 50 0 019 V 5 Typ P P vi 3 Typ Flexiwatt27 vertical v2 20 Typ v3 45 Typ 7139011 E GAPGPS00096 Doc ID 17715 Rev 2 13 15 Revision history TDA7851A 6 14 15 Revision history Table 5 Document revision history Date Revision Changes 09 Jul 2010 1 Initial release 43 Jun 2012 2 Updated PERRIS on page i u Updated Section 3 2 Electrical characteristics on page 7 Doc ID 17715 Rev 2 TDA7851A 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 herein 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 assumes no liability whatsoever relating to the choice selection or use of the ST product
7. FSET DETECTOR OUT o C8 C7 0 1uF 2200uF I Vcc1 2 O ST BY o OUT1 MUTE o OUT2 IN1 IN2 OUT3 IN3 IN4 OUT4 GAPGPS01687 Doc ID 17715 Rev 2 5 15 Pin description TDA7851A 2 Pin description 2 1 Pin connection Figure 3 Pin connection top view stBY _ Vecl _ OUT1 PwGND svR I _ IN1 wf amp cGND INA Wall i AC GND ______ vc OUT4 ofl TAB LL OUT2 MUTE T_T OUT4 PW GND T_T OUT2 OUT1 OUT3 PW GND _ OUT3 mw OFF DET D Pw GND D GAPGPS01688 2 2 Thermal data Table 2 Thermal data Parameter Rin Losse Thermal resistance junction to case Max 1 C W 6 15 Doc ID 17715 Rev 2 ki TDA7851A Electrical specifications 3 Electrical specifications 3 1 Absolute maximum ratings Table 3 Absolute maximum ratings Symbol Parameter Value Unit Vs Operating supply voltage 18 V Vs pc DC supply voltage 28 V Vs pk Peak supply voltage for t 50 ms 50 V Output peak current lo Non repetitive t 100 us 10 A Repetitive duty cycle 10 at f 10 Hz 9 A Prot Power dissipation Tease 70 C 85 Tj Junction temperature 150 C Tag Storage temperature 55 to 150 C 3 2 Electrical characteristics Refer to the test and application diagram V 14 4 V R 4 Q Rg 600 Q f 1 kHz
8. Tam 25 C unless otherwise specified Table 4 Electrical characteristics Symbol Parameter Test condition Min Typ Max Unit Vs Supply voltage range 8 18 V lat Quiescent current Ri 100 150 300 mA Vos Output offset voltage Play mode Mute mode 60 60 mV During mute ON OFF output offset 40 10 mV og voltage ITU R ARM weighted 9S During standby ON OFF output see Figure 18 10 10 mV offset voltage Gy Voltage gain 25 26 27 dB dG Channel gain unbalance 1 dB Vg 14 4 V THD 10 25 28 W Vs 14 4 V THD 1 22 W Po Output power Vg 14 4 V THD 10 2 Q 48 Ww Vs 14 4 V THD 1 20 38 W Vg 14 4V R 240 45 W Po max Max output power Vs 14 4V R 220 75 W Vg 15 2 V RL 240 48 W THD Distortion Po AW 0 01 0 05 ky Doc ID 17715 Rev 2 7 15 Electrical specifications TDA7851A Table 4 Electrical characteristics continued Symbol Parameter Test condition Min Typ Max Unit A Weighted 35 uV tput S Apune Bw 20 Hz to 20 kHz 50 100 pv SVR Supply voltage rejection f 100 Hz V 1 Vrms 50 70 dB foh High cut off frequency Po 0 5 W 100 300 kHz Ri Input impedance 70 100 130 kQ f 1 kHz Po 4W 60 70 dB talk EE eet f 10 kHz Po 4W 60 dB Vst by 1 2V 20 pA Isp Standby current consumption Vst by 0 10 pA Jong Standby pin current Vstby 1 2 V to 2 6 V
9. igure 10 Distortion vs frequency Ry 2 0 Figure 11 Crosstalk vs frequency 10 100 1000 f Hz 0000 100000 GAPGPS01695 CROSSTALK dB 10 100 10000 100000 GAPGPS01696 Figure 12 Supply voltage rejection vs frequency Figure 13 Output attenuation vs supply voltage 10 100 10000 100000 GAPGPS01697 OUTPUT ATTN dB 10 GAPGPS01698 Figure 14 Power dissipation and efficiency vs output power R 4 SINE Figure 15 Power dissipation and efficiency vs output power R 2 SINE Prot W n 76 90 90 n 80 V 14 4 V 80 R 4x 40 70 f 1 KHz SINE 70 60 60 50 50 40 40 P 30 8 30 20 20 10 10 0 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 P W GAPGPS01699 180 Pio W ns 160 V 14 4V 80 R 4x2Q n 140 f 1 KHz SINE 70 120 60 100 50 8
10. ime sequence and consequently plays an essential role in the pop optimization during ON OFF transients To conveniently serve both needs its minimum recommended value is 10 pF Input stage The TDA78514A s inputs are ground compatible and can stand very high input signals x 8 Vpk without any performance degradation If the standard value for the input capacitors 0 1uF is adopted the low frequency cut off amounts to 16 Hz The input capacitors should be 1 4 of the capacitor connected to AC GND pin for optimum pop performance Standby and muting Standby and muting facilities are both CMOS compatible In absence of true CMOS ports or microprocessors a direct connection to Vs of these two pins is admissible but a 470 kQ equivalent resistance should present between the power supply and the muting and stand by pins R C cells have always to be used in order to smooth down the transitions for preventing any audible transient noises About the standby the time constant to be assigned in order to obtain a virtually pop free transition has to be slower than 2 5 V ms Heatsink definition Under normal usage 4 speakers the heatsink s thermal requirements have to be deduced from Figure 16 which reports the simulated power dissipation when real music speech programmes are played out Noise with gaussian distributed amplitude was employed for this simulation Based on that frequent clipping occurrence worst case causes Pgiss 26 W
11. ram and application circuit ooooooooooo 5 1 1 Block Ls A arate x EE RE 5 1 2 Application circuit 5 2 Pin description WEE 6 2 1 Pin connection ooo 6 2 2 Thermaldata wisin a ia ieee bee ewe a ee A 6 3 Electrical specifications 7 3 1 Absolute maximum ratings 7 3 2 Electrical characteristics NEI essa sive ee NEEN ENNEN ened 7 3 3 Electrical characteristics curves 0 0 0 ee 9 4 Application hints Sek RENE ERNEIEREN REEL ER Ir RE RA e xs 12 4 1 DO ase delector gen sedes x Citta ex d ege Clo e e edo qat Oe 12 42 E Pcr 12 4 3 elei EE ias idos 12 44 Standby and mung 12 4 5 Heatsink definition 12 5 Package information LLl leeeeeeeeeeses 13 6 Revision history xau auda d ore dd ROCA AER REN Re 14 2 5 Doc ID 17715 Rev 2 ky TDA7851A List of tables List of tables Table 1 Device eur ius cures er EE asp ne Pace aa bo ade Sede NEE os 1 Table 2 Thermal data e Dai A ED SOROR RA EROR ln ED do Ro on cn acd DR n dise e 6 Table 3 Absolute maximum ratings 0 2 0 0 0 cc n 7 Table 4 Electrical characheristtce llli 7 Table 5 Document revision history Ly Doc ID 17715 Rev 2 3 15 List of figures TDA7851A List of figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 4 15 Block diagram
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13. 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 whatsoever 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 Italy Japan Malaysia Malta Morocco Philippines Singapore Spain Sweden Switzerland United Kingdom United States of America www st com Ly Doc ID 17715 Rev 2 15 15
14. umbo ber d dp Ur tates od EE SE ENEE ea uw 5 Application circuit pee peri lise RR IRI I e I 3r 5 Pin connection top view 6 Quiescent current vs supply voltage 9 Output power vs supply voltage RL 24 Q ooococcccccccr eh 9 Output power vs supply voltage RL 2Q 0 eh 9 Distortion vs output power Ry 24 Q coccoccocccoc res 9 Distortion vs output power Ry 320 9 Distortion vs frequency RL AO 9 Distortion vs frequency RL 2Q 00 0 ren 10 Crosstalk vs frequency ooccooccooc ee 10 Supply voltage rejection vs frequency l l 10 Output attenuation vs supply voltage 10 Power dissipation and efficiency vs output power RJ 4 Q SINE 10 Power dissipation and efficiency vs output power R 2 Q SINE 10 Power dissipation vs output power R 4 Q audio program simulation 11 Power dissipation vs output power R 2 Q audio program simulation 11 ITU R ARM frequency response weighting filter for transient pop 11 Flexiwatt27 mechanical data and package dimensions 000e eee eae 13 Doc ID 17715 Rev 2 ky TDA7851A Block diagram and application circuit 1 1 1 2 Y Block diagram and application circuit Block diagram Figure 1 Block diagram OFFSET DETECTOR GAPGPS01686 Application circuit Figure 2 Application circuit OF
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ST TDA7851A 4 x 48 W MOSFET quad bridge power amplifier handbook