TDA7850A 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 30 W/4 @ 14.4 V, 1 kHz, 10 % - 4 x 80 W/2 max. - 4 x 55 W/2 @ 14.4 V, 1 kHz, 10 % MOSFET output power stage Excellent 2 driving capability Hi-fi class distortion Low output noise Standby function Mute function Automute at min. supply voltage detection '!0'03 Flexiwatt27 (Horizontal) Low external component count: - Internally fixed gain (26 dB) - No external compensation - No bootstrap capacitors On board 0.35 A high side driver Protections: - Output short circuit to GND, to Vs, across the load - Very inductive loads - Overrating chip temperature with soft thermal limiter - Output DC offset detection - Load dump voltage - Fortuitous open gnd - Reversed battery - ESD Table 1. '!0'03 Flexiwatt27 (VertIcal) Description The TDA7850A is a breakthrough MOSFET technology class AB audio power amplifier in Flexiwatt27 package designed for high power car radio. The fully complementary P-Channel/NChannel 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. The TDA7850A integrates a DC offset detector. Device summary Order code Package Packing TDA7850A Flexiwatt27 (vertical) Tube TDA7850AH Flexiwatt27 (horizontal Tube August 2012 This is information on a product in full production. Doc ID 13998 Rev 4 1/16 www.st.com 1 Contents TDA7850A Contents 1 Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.3 Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.4 DC offset detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.5 Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2/16 Doc ID 13998 Rev 4 TDA7850A List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Doc ID 13998 Rev 4 3/16 List of figures TDA7850A 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. Figure 20. 4/16 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 4 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 2 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Distortion vs. frequency (RL = 4 ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Distortion vs. frequency (RL = 2 ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Output attenuation vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Power dissipation and efficiency vs. output power (RL = 4 , SINE) . . . . . . . . . . . . . . . . . 11 Power dissipation and efficiency vs. output power (RL = 2 , SINE) . . . . . . . . . . . . . . . . . 11 Power dissipation vs. output power (RL = 4, audio program simulation) . . . . . . . . . . . . . 11 Power dissipation vs. output power (RL = 2, audio program simulation) . . . . . . . . . . . . . 11 ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 11 Flexiwatt27 (horizontal) mechanical data and package dimensions. . . . . . . . . . . . . . . . . . 13 Flexiwatt27 (vertical) mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . 14 Doc ID 13998 Rev 4 TDA7850A Block diagram and application circuit 1 Block diagram and application circuit 1.1 Block diagram Figure 1. Block diagram 6CC 6CC M& N& 34 "9 /&& $%4 -54% (3$ (3$/&& $%4 /54 ). /54 M& 07 '.$ /54 ). /54 07 '.$ M& /54 ). /54 M& 07 '.$ /54 ). /54 M& 07 '.$ 362 !# '.$ 4!" 3 '.$ M& M& *$3*36 1.2 Standard test and application circuit Figure 2. Standard test and application circuit # M& # M& 6CC 6CC 2 34 "9 + 2 # M& -54% + # M& # ). ). /54 M& # M& ). /54 # M& ). # M& /54 3 '.$ # M& /54 362 # M& (3$/&& $%4 Doc ID 13998 Rev 4 /&& $%4 4!" *$3*36 5/16 Pin description 2 TDA7850A Pin description Figure 3. Pin connections (top view) 4!" /&& $%4 07 '.$ /54 34 "9 /54 6## /54 07 '.$ /54 362 ). ). 9HUWLFDO 3 '.$ ). ). !# '.$ /54 07 '.$ /54 6## /54 -54% /54 07 '.$ (3$ 4!" 4!" /&& $%4 07 '.$ /54 34 "9 /54 6## /54 07 '.$ /54 362 ). ). 3 '.$ +RUL]RQWDO ). ). !# '.$ /54 07 '.$ /54 6## /54 -54% /54 07 '.$ (3$ 4!" *$3*36 6/16 Doc ID 13998 Rev 4 TDA7850A Electrical specifications 3 Electrical specifications 3.1 Absolute maximum ratings Table 2. Absolute maximum ratings Symbol Value Unit Operating supply voltage 18 V VS (DC) DC supply voltage 28 V VS (pk) Peak supply voltage (for t = 50 ms) 50 V Output peak current repetitive (duty cycle 10 % at f = 10 Hz) non repetitive (t = 100 s) 9 10 A A Power dissipation Tcase = 70 C 80 W Tj Junction temperature 150 C Tstg Storage temperature -55 to 150 C Value Unit 1 C/W VS IO Ptot 3.2 Parameter Thermal data Table 3. Thermal data Symbol Rth j-case 3.3 Parameter Thermal resistance junction-to-case Max. Electrical characteristics Refer to the test and application diagram, VS = 14.4 V; RL = 4 ; Rg = 600 ; f = 1 kHz; Tamb = 25 C; unless otherwise specified. Table 4. Symbol Iq1 VOS Electrical characteristics Parameter Quiescent current RL = Output offset voltage Play mode - Mute mode During mute ON/OFF output offset voltage dVOS Test condition During St-By ON/OFF output offset voltage ITU R-ARM weighted see Figure 18 Min. Typ. Max. Unit 100 180 280 mA - - 50 mV -10 - +10 mV -10 - +10 mV Gv Voltage gain - 25 26 27 dB dGv Channel gain unbalance - - - 1 dB Doc ID 13998 Rev 4 7/16 Electrical specifications Table 4. Electrical characteristics (continued) Symbol Po TDA7850A Parameter Output power Test condition Min. Typ. Max. Unit VS = 13.2 V; THD = 10 % VS = 13.2 V; THD = 1 % VS = 14.4 V; THD = 10 % VS = 14.4 V; THD = 1 % 23 16 28 20 25 19 30 23 - W VS = 14.4 V; THD = 10 %, 2 50 55 W Max. output power(1) VS = 14.4 V; RL = 4 VS = 14.4 V; RL = 2 - 50 85 - W THD Distortion Po = 4 W Po = 15 W; RL = 2 - 0.006 0.015 0.02 0.03 % eNo Output noise "A" Weighted Bw = 20 Hz to 20 kHz - 35 50 50 70 V SVR Supply voltage rejection f = 100 Hz; Vr = 1 Vrms 50 75 - dB fch High cut-off frequency PO = 0.5 W 100 300 - KHz Ri Input impedance 80 100 120 K CT Cross talk 60 - 70 60 - dB - 20 Standby current consumption VST-BY = 1.5 V - ISB VST-BY = 0V - - 10 Ipin5 Standby pin current VST-BY = 1.5V to 3.5V - - 1 A VSB out Standby out threshold voltage (Amp: ON) 2.75 - - V VSB in Standby in threshold voltage (Amp: OFF) - - 1.5 V Mute attenuation POref = 4W 80 90 - dB VM out Mute out threshold voltage (Amp: Play) 3.5 - - V VM in Mute in threshold voltage (Amp: Mute) - - 1.5 V VS automute threshold (Amp: Mute) Att 80 dB; POref = 4 W (Amp: Play) Att < 0.1 dB; PO = 0.5 W 6.5 7 Po max. AM VAM in Ipin23 f = 1 kHz; PO = 4 W f = 10 kHz; PO = 4 W A V 7.5 8 VMUTE = 1.5 V (Sourced Current) 7 12 18 A VMUTE = 3.5 V -5 - 18 A Dropout voltage IO = 0.35 A; VS = 9 to 16 V - 0.25 0.6 V Current limits - 400 - 800 mA Muting pin current HSD section Vdropout Iprot 8/16 Doc ID 13998 Rev 4 TDA7850A Electrical specifications Table 4. Electrical characteristics (continued) Symbol Parameter Test condition Min. Typ. Max. Unit 8 - - V - - 6 V Offset detector (Pin 26) VM_ON Mute voltage for DC offset detection enabled VM_OFF VST-BY = 5 V VOFF Detected differential output offset VST-BY = 5 V; Vmute = 8 V 2 3 4 V V26_T Pin 26 voltage for detection = TRUE VST-BY = 5 V; Vmute = 8 V VOFF > 4 V 0 - 1.5 V V26_F Pin 26 voltage for detection = FALSE VST-BY = 5 V; Vmute = 8 V VOFF > 2 V 12 - - V 1. Saturated square wave output. 3.4 Electrical characteristic curves Figure 4. Quiescent current vs. supply voltage Figure 5. 0O 7 )D M! 6I 2, c Output power vs. supply voltage (RL = 4 ) 0O MAX 2, 7 F +(Z 4($ 4($ 6S 6 Figure 6. Output power vs. supply voltage (RL = 2 ) 6S 6 '!0'03 Figure 7. 0O 7 '!0'03 Distortion vs. output power (RL = 4 ) 4($ 0O MAX 2, 7 F +(Z 63 6 2, 7 4($ F +(Z 4($ F +(Z 6S 6 '!0'03 Doc ID 13998 Rev 4 0O 7 '!0'03 9/16 Electrical specifications Figure 8. TDA7850A Distortion vs. output power (RL = 2 ) Figure 9. 4($ 4($ 63 6 2, 7 63 6 2, 7 0O 7 Distortion vs. frequency (RL = 4 ) F +(Z F +(Z 0O 7 '!0'03 F (Z Figure 11. Crosstalk vs. frequency 4($ #2/334!,+ D" 63 6 2, 7 0O 7 '!0'03 Figure 10. Distortion vs. frequency (RL = 2 ) 2, 7 0O 7 2G 7 Figure 12. Supply voltage rejection vs. frequency '!0'03 Figure 13. Output attenuation vs. supply voltage /54054 !44. D" 2G 7 6RIPPLE 6RMS F (Z 362 D" '!0'03 F (Z 2, 7 0O 7 REF F (Z 10/16 '!0'03 Doc ID 13998 Rev 4 6S 6 '!0'03 TDA7850A Electrical specifications Figure 14. Power dissipation and efficiency vs. output power (RL = 4 , SINE) H 0TOT 7 Figure 15. Power dissipation and efficiency vs. output power (RL = 2 , SINE) 0TOT 7 H H 63 6 2, X 7 F +(Z 3).% 63 6 2, X 7 F +(Z 3).% H 0O 7 0TOT 0TOT 0O 7 '!0'03 '!0'03 Figure 16. Power dissipation vs. output power Figure 17. Power dissipation vs. output power (RL = 4, audio program simulation) (RL = 2, audio program simulation) 0TOT 7 63 6 2, X 7 '!533)!. ./)3% 0TOT 7 63 6 2, X 7 '!533)!. ./)3% #,)0 34!24 #,)0 34!24 '!0'03 0O 7 0O 7 '!0'03 Figure 18. ITU R-ARM frequency response, weighting filter for transient pop /UTPUT ATTENUATION D" (Z '!0'03 Doc ID 13998 Rev 4 11/16 Application hints 4 TDA7850A Application hints Ref. to the circuit of Figure 2. 4.1 SVR Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF time 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 10F. 4.2 Input stage The TDA7850A's inputs are ground-compatible and can stand very high input signals ( 8Vpk) without any performance degradation. If the standard value for the input capacitors (0.1F) is adopted, the low frequency cut-off will amount to 16 Hz. 4.3 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 470k equivalent resistance should be 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 stand-by, the time constant to be assigned in order to obtain a virtually pop-free transition has to be slower than 2.5V/ms. 4.4 DC offset detector The TDA7850A 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. The DC offset detection can be available at 2 different pins: - - 4.5 Pin 2 (always enabled) Pin 26. Only enabled if Vmute (pin23) is set higher than 8V. If not (Vmute < 6 V) pin 26 will revert to the original HSD function. Heatsink definition Under normal usage (4 Ohm 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) will cause Pdiss = 26W. Assuming Tamb = 70C and TCHIP = 150C as boundary conditions, the heatsink's thermal resistance should be approximately 2C/W. This would avoid any thermal shutdown occurrence even after long-term and full-volume operation. 12/16 Doc ID 13998 Rev 4 TDA7850A Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. Figure 19. Flexiwatt27 (horizontal) mechanical data and package dimensions ',0 PP 7<3 0,1 $ % & ' ( ) * * + + + + / / / / / / / 0 0 0 1 3 5 5 5 5 5 9 9 9 9 0$; 0,1 LQFK 7<3 0$; 287/,1($1' 0(&+$1,&$/'$7$ 7\S 7\S 7\S 7\S )OH[LZDWW +RUL]RQWDO GDPEDUSURWXVLRQQRWLQFOXGHG PROGLQJSURWXVLRQLQFOXGHG % & 9 9 + 9 + ' + + 5 1 5 / 9 / 9 / 5 5 0 9 * ) 5 * 3 0 ( 5 / / / / 5 Package information 0 & '!0'03 Doc ID 13998 Rev 4 13/16 Package information TDA7850A Figure 20. Flexiwatt27 (vertical) mechanical data and package dimensions ',0 0,1 $ % & ' ( ) * * + + + + / / / / / / 0 0 1 2 5 5 5 5 5 9 9 9 9 PP 7<3 0$; 0,1 LQFK 7<3 0$; 287/,1($1' 0(&+$1,&$/'$7$ 7\S 7\S 7\S 7\S )OH[LZDWW YHUWLFDO GDPEDUSURWXVLRQQRWLQFOXGHG PROGLQJSURWXVLRQLQFOXGHG 6 # " 6 ( ( 6 ! ( / ( 2 , 2 6 2 , . , 2 , , 6 6 2 , 0IN $ 2 2 2 % ' ' & - - % '!0'03 14/16 Doc ID 13998 Rev 4 TDA7850A 6 Revision history Revision history Table 5. Document revision history Date Revision Changes 09-Oct-2007 1 Initial release. 12-Sep-2008 2 Updated the values of VOS and THD parameters on the Table 4. 07-Nov-2008 3 Modified max. values of the THD distortion in Table 4: Electrical characteristics on page 8. 14-Aug-2012 4 Updated Section 5: Package information. Doc ID 13998 Rev 4 15/16 TDA7850A 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 products and services described herein. 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The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 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 16/16 Doc ID 13998 Rev 4