TDA7851L 4 x 45 W MOSFET quad bridge power amplifier Features ■ Multipower BCD technology ■ High output power capability: – 4 x 45 W/4 Ω Max. – 4 x 28 W/4 Ω @ 14.4 V, 1 kHz, 10 % – 4 x 72 W/2 Ω Max. ■ MOSFET output power stage ■ Excellent 2 Ω driving capability ■ Hi-Fi class distortion ■ Low output noise ■ Standby function ■ Mute function ■ Automute at min. supply voltage detection ■ Low external component count: – Internally fixed gain (26 dB) – No external compensation – No bootstrap capacitors Flexiwatt 25 ■ Output short circuit to Gnd, to Vs, across the load ■ Very inductive loads ■ Overrating chip temperature with soft thermal limiter ■ Load dump voltage May 2009 Fortuitous open GND ■ Reversed battery ■ ESD Description Protections Table 1. ■ The TDA7851L is a breakthrough MOSFET technology class AB audio power amplifier in Flexiwatt25 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. Device summary Order code Package Packing TDA7851L Flexiwatt 25 Tube Rev 1 1/15 www.st.com 1 Contents TDA7851L Contents 1 2 3 4 Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.3 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.1 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.3 Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4.4 Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15 Rev 1 TDA7851L List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Rev 1 3/15 List of figures TDA7851L 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output power vs. supply voltage (RL = 2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. output power (RL = 2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. frequency (RL = 4 Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Distortion vs. frequency (RL = 2 Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Ω, SINE) . . . . . . . . . . . . . . . . . 10 Power dissipation and efficiency vs. output power (RL = 2 Ω, SINE) . . . . . . . . . . . . . . . . . 10 Power dissipation vs. output power (RL = 4 Ω, audio program simulation) . . . . . . . . . . . . 11 Power dissipation vs. output power (RL = 2 Ω, audio program simulation) . . . . . . . . . . . . 11 ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 11 Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Rev 1 TDA7851L Block diagram and application circuit 1 Block diagram and application circuit 1.1 Block diagram Figure 1. Block diagram Vcc1 Vcc2 ST-BY CD MUTE OUT1+ OUT1- IN1 PW-GND OUT2+ OUT2- IN2 PW-GND OUT3+ OUT3- IN3 PW-GND OUT4+ OUT4- IN4 PW-GND AC-GND SVR TAB S-GND D06AU1646 1.2 Application circuit Figure 2. Application circuit C8 0.1μF C7 2200μF Vcc1-2 Vcc3-4 6 R1 20 4 ST-BY 10K R2 9 C9 1μF 8 22 MUTE 47K C10 1μF 5 C1 3 0.1μF IN2 12 17 C2 0.1μF OUT3 18 IN3 19 15 C3 0.1μF 21 24 14 IN4 C4 0.1μF OUT2 2 11 IN1 OUT1 7 S-GND 13 16 C5 0.47μF OUT4 23 10 C6 47μF 25 SVR 1 CD TAB D06AU1647A R3 V 47K CD OUT Rev 1 5/15 Pin description TDA7851L 2 Pin description 2.1 Pin connection Pin connection (top view) P-GND4 MUTE OUT4- VCC OUT4+ OUT3- OUT3+ P-GND3 IN3 AC-GND IN4 IN2 S-GND IN1 SVR OUT1+ P-GND1 VCC OUT1- ST-BY OUT2+ OUT2- TAB 25 P-GND2 1 CD Figure 3. D94AU159mod 2.2 Thermal data Table 2. Symbol Rth j-case 6/15 Thermal data Parameter Thermal resistance junction-to-case Rev 1 Max Value Unit 1 °C/W TDA7851L Electrical specifications 3 Electrical specifications 3.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol Parameter 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 Non repetitive (t = 100 µs) Repetitive (duty cycle 10 % at f = 10 Hz) 10 9 A A Power dissipation Tcase = 70 °C 85 W Junction temperature 150 °C VS IO Ptot Tj Tamb Operating temperature range -40 to 105 °C Tstg Storage temperature -55 to 150 °C 3.2 Electrical characteristics Table 4. Electrical characteristics (Refer to the test and application diagram, VS = 14.4 V; RL = 4 Ω; Rg = 600 Ω; f = 1 kHz; Tamb = 25 °C; unless otherwise specified). Symbol Parameter Test condition Min. Typ. Max. Unit 8 - 18 V VS Supply voltage range - Iq1 Quiescent current RL = ∞ 100 150 300 mA Output offset voltage Play mode / Mute mode -60 - +60 mV -10 - +10 mV -10 - +10 mV 25 26 27 dB ±1 dB VOS During mute on/off output offset voltage dVOS ITU R-ARM weighted During standby on/off output offset see Figure 18 voltage Gv Voltage gain - dGv Channel gain unbalance - Po Po max. THD VS = 14.4 V; THD = 10 % VS = 14.4 V; THD = 1 % 25 - 28 22 - W W VS = 14.4 V; THD = 10 %, 2 Ω VS = 14.4 V; THD = 1 %, 2 Ω - 48 38 - W W Max. output power(1) VS = 14.4 V; RL = 4 Ω VS = 14.4 V; RL = 2 Ω - 45 75 - W W Distortion Po = 4 W - 0.01 0.05 % Output power Rev 1 7/15 Electrical specifications Table 4. TDA7851L Electrical characteristics (continued) (Refer to the test and application diagram, VS = 14.4 V; RL = 4 Ω; Rg = 600 Ω; f = 1 kHz; Tamb = 25 °C; unless otherwise specified). Symbol Parameter Test condition Min. Typ. Max. Unit - 35 50 100 µV µV eNo Output noise "A" Weighted Bw = 20 Hz to 20 kHz SVR Supply voltage rejection f = 100 Hz; Vr = 1 Vrms 50 70 - dB fch High cut-off frequency PO = 0.5 W 100 300 - KHz Ri Input impedance 70 100 130 KΩ CT Cross talk 60 - 70 60 - dB dB - 20 µA Standby current consumption VSt-by = 1.2 V - ISB VSt-by = 0 - - 10 µA Ipin5 Standby pin current VSt-by = 1.2 V to 2.6 V - - ±1 µA VSB out Standby out threshold voltage (Amp: ON) 2.6 - - V VSB in Standby in threshold voltage (Amp: OFF) - - 1.2 V Mute attenuation POref = 4 W 80 90 - dB VM out Mute out threshold voltage (Amp: Play) 2.6 - - V VM in Mute in threshold voltage (Amp: Mute) - - 1.2 V (Amp: Mute) Att ≥ 80 dB; POref = 4 W 6.7 7 - V (Amp: Play) Att < 0.1 dB; PO = 0.5 W - 7.5 8 V VMUTE = 1.2 V (Sourced current) 7 12 18 µA VMUTE = 2.6 V -5 - 18 µA AM VAM in Ipin23 f = 1 kHz PO = 4 W f = 10 kHz PO = 4 W VS automute threshold Muting pin current Clipping detector CDLK Clip detector high leakage current Cd off - 0 1 µA CDSAT Clip detector saturation voltage DC On; ICD = 1 mA - 0.2 0.4 V CDTHD Clip detector THD level - - 2 - % 1. Saturated square wave output 8/15 Rev 1 TDA7851L Electrical specifications 3.3 Electrical characteristic curves Figure 4. Quiescent current vs. supply voltage Figure 5. Po (W) Id (mA) 180 170 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 Vi = 0 RL = ∞ 160 150 140 130 120 8 Output power vs. supply voltage (RL = 4 Ω) 10 12 14 16 Figure 6. THD=10% THD=1% 18 Vs (V) Po-max RL= 4Ω f =1 KHz 8 9 10 11 12 Output power vs. supply voltage (RL = 2 Ω) 13 14 15 16 Vs (V) AC00024 Figure 7. Po (W) 17 18 AC00025 Distortion vs. output power (RL = 4 Ω) THD (% ) 10 130 120 110 Po-max RL=2Ω f=1 KHz 100 Vs = 14.4 V RL = 4Ω 1 90 80 f = 10 KHz THD=10% 70 0.1 60 50 40 f = 1 KHz THD=1% 0.01 30 20 10 0 8 9 10 11 12 13 14 15 16 Vs (V) Figure 8. 17 18 0.001 0.1 1 Distortion vs. output power (RL = 2 Ω) Figure 9. THD (% ) 10 10 10 100 Po (W) AC00026 Distortion vs. frequency (RL = 4 Ω) THD (% ) Vs = 14.4 V RL = 2 Ω 1 1 AC00027 Vs = 14.4 V RL = 4 Ω Po = 4 W f = 10 KHz 0.1 0.1 f = 1 KHz 0.01 0.01 0.001 0.1 1 10 Po (W) 100 0.001 10 AC00028 Rev 1 100 1000 f (Hz) 10000 100000 AC00029 9/15 Electrical specifications TDA7851L Figure 10. Distortion vs. frequency (RL = 2 Ω) THD (% ) 10 CROSSTALK (dB) -20 RL = 4 Ω Po = 4W Rg = 600 Ω -30 Vs = 14.4 V RL = 2Ω Po = 8 W 1 Figure 11. Crosstalk vs. frequency -40 -50 -60 0.1 -70 -80 0.01 -90 0.001 10 100 1000 10000 100000 f (Hz) 1000 10000 100000 f (Hz) AC00031 Figure 13. Output attenuation vs. supply voltage SVR (dB) OUTPUT ATTN (dB) 0 Rg = 600 Ω Vripple = 1Vrms -30 100 AC00030 Figure 12. Supply voltage rejection vs. frequency -20 -100 10 -40 RL = 4Ω Po = 4 W ref -20 -50 -40 -60 -70 -60 -80 -80 -90 -100 10 -100 100 1000 10000 100000 f (Hz) 5 6 7 Figure 14. Power dissipation and efficiency vs. output power (RL = 4 Ω, SINE) 9 10 AC00033 Figure 15. Power dissipation and efficiency vs. output power (RL = 2 Ω, SINE) η (% ) Ptot (W) 8 Vs (V) AC00032 η (%) Ptot (W) 90 180 80 160 70 140 60 60 120 60 50 50 100 50 40 40 80 30 60 20 20 40 20 10 10 20 10 0 0 0 90 80 η Vs = 14.4 V RL = 4 x 4Ω f = 1 KHz SINE 70 Ptot 30 0 2 4 6 8 10 12 14 16 Po (W) 10/15 18 20 22 24 26 28 80 Vs = 14.4 V RL = 4 x 2Ω f = 1 KHz SINE η 40 5 10 15 20 25 Po (W) Rev 1 70 Ptot 0 AC00034 90 30 30 35 40 45 0 50 AC00035 TDA7851L Figure 16. Electrical specifications Power dissipation vs. output power Figure 17. (RL = 4 Ω, audio program simulation) Ptot (W) 30 Ptot (W) 60 55 Vs = 14.4 V RL = 4 x 4 Ω GAUSSIAN NOISE 25 Power dissipation vs. output power (RL = 2 Ω, audio program simulation) Vs = 14.4 V RL = 4 x 2 Ω GAUSSIAN NOISE 50 45 CLIP START 40 20 CLIP START 35 30 15 25 20 10 15 10 5 5 0 1 2 3 4 5 Po (W) 6 AC00036 0 2 4 6 Po (W) 8 10 AC00037 Figure 18. ITU R-ARM frequency response, weighting filter for transient pop Output attenuation (dB) 10 0 -10 -20 -30 -40 -50 10 100 1000 Hz 10000 100000 AC00343 Rev 1 11/15 Application hints 4 Application hints 4.1 SVR TDA7851L 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 10µF. 4.2 Input stage The TDA7851L's inputs are ground-compatible and can stand very high input signals (± 8 Vpk) without any performances degradation. If the standard value for the input capacitors (0.1µF) is adopted, the low frequency cut-off will amount to 16 Hz. The input capacitors should be 1/4 of the capacitor connected to AC-GND pin for optimum pop performances. 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 470 kΩ equivalent resistance should present between the power supply and the muting and standby 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. 4.4 Heatsink definition Under normal usage (4 Ω 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 = 26 W. Assuming Tamb = 70° C and TCHIP = 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. 12/15 Rev 1 TDA7851L 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. Flexiwatt25 mechanical data and package dimensions DIM. A B C D E F (1) G G1 H (2) H1 H2 H3 L (2) L1 L2 (2) L3 L4 L5 M M1 N O R R1 R2 R3 R4 V V1 V2 V3 MIN. 4.45 1.80 0.75 0.37 0.80 23.75 28.90 22.07 18.57 15.50 7.70 3.70 3.60 mm TYP. 4.50 1.90 1.40 0.90 0.39 1.00 24.00 29.23 17.00 12.80 0.80 22.47 18.97 15.70 7.85 5 3.5 4.00 4.00 2.20 2 1.70 0.5 0.3 1.25 0.50 MAX. 4.65 2.00 MIN. 0.175 0.070 1.05 0.42 0.57 1.20 24.25 29.30 0.029 0.014 0.031 0.935 1.139 22.87 19.37 15.90 7.95 0.869 0.731 0.610 0.303 4.30 4.40 0.145 0.142 inch TYP. 0.177 0.074 0.055 0.035 0.015 0.040 0.945 1.150 0.669 0.503 0.031 0.884 0.747 0.618 0.309 0.197 0.138 0.157 0.157 0.086 0.079 0.067 0.02 0.12 0.049 0.019 MAX. 0.183 0.079 OUTLINE AND MECHANICAL DATA 0.041 0.016 0.022 0.047 0.955 1.153 0.904 0.762 0.626 0.313 0.169 0.173 Flexiwatt25 (vertical) 5˚ (T p.) 3˚ (Typ.) 20˚ (Typ.) 45˚ (Typ.) (1): dam-bar protusion not included (2): molding protusion included V C B V H H1 V3 A H2 O H3 R3 L4 R4 V1 R2 L2 N R L3 5 Package information L L1 V1 V2 R2 D R1 L5 Pin 1 R1 R1 E G G1 F FLEX25ME M M1 7034862 Rev 1 13/15 Revision history 6 TDA7851L Revision history Table 5. 14/15 Document revision history Date Revision 26-May-2009 1 Changes Initial release. Rev 1 TDA7851L 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. 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