TDA7854 4 x 47W MOSFET quad bridge power amplifier Features ■ Multipower BCD technology ■ High output power capability: – 4 x 47W/4Ω max. – 4 x 80W/2Ω max. ■ MOSFET output power stage ■ Excellent 2Ω driving capability ■ Hi-fi class distortion ■ Low output noise ■ St-by function ■ Mute function ■ Automute at min. supply voltage detection ■ Low external component count: – Internally fixed gain (26dB) – No external compensation – No bootstrap capacitors Flexiwatt 25 ■ Fortuitous open GND ■ Reversed battery ■ ESD Description Protections: ■ Output short circuit to GND, to Vs, across the load ■ Very inductive loads ■ Overrating chip temperature with soft thermal limiter ■ Load dump voltage The TDA7854 is a breakthrough MOSFET technology class AB audio power amplifier in Flexiwatt 25 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. Table 1. Device summary Order code Package Packing TDA7854 Flexiwatt 25 Tube October 2007 Rev 1 1/12 www.st.com 1 Contents TDA7854 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 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.1 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.3 Stand-by and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.4 Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2/12 TDA7854 List of tables List of tables Table 2. Table 3. Table 4. Table 5. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3/12 List of figures TDA7854 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. 4/12 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Power dissipation vs. output power (RL = 4Ω, audio program simulation) . . . . . . . . . . . . . . 9 Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 TDA7854 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 47K 7 C10 1μF 5 C1 3 0.1μF 12 IN2 17 C2 0.1μF OUT3 18 IN3 19 15 C3 0.1μF 21 IN4 14 C4 0.1μF OUT2 2 11 IN1 OUT1 8 22 MUTE S-GND 23 16 C5 0.47μF OUT4 24 13 10 C6 47μF 25 SVR 1 CD TAB D06AU1647A R3 V 47K CD OUT 5/12 Pin description TDA7854 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 6/12 Thermal data Parameter Thermal resistance junction to case max Value Unit 1 °C/W TDA7854 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 = 50ms) 50 V Output peak current Non repetitive (t = 100μs) Repetitive (duty cycle 10% at f = 10Hz) 10 9 A A Power dissipation Tcase = 70°C 85 W Tj Junction temperature 150 °C Tstg Storage temperature -55 to 150 °C VS IO Ptot 3.2 Electrical characteristics Table 4. Electrical characteristics (Refer to the test and application diagram, VS = 14.4V; RL = 4Ω; Rg = 600Ω; f = 1KHz; Tamb = 25°C; unless otherwise specified). Symbol Parameter Test condition Min. Typ. Max. Unit 150 250 mA +60 mV 27 dB ±1 dB Quiescent current RL = ∞ 100 VOS Output offset voltage Play mode / Mute mode -60 Gv Voltage gain dGv Channel gain unbalance Iq1 25 26 VS = 14.4V; THD = 10% VS = 14.4V; THD = 1% 28 22 W W VS = 14.4V; THD = 10%, 2Ω VS = 14.4V; THD = 1%, 2Ω 48 38 W W Max. output power(1) VS = 15.2V; RL = 4Ω VS = 15.2V; RL = 2Ω 47 80 W W THD Distortion Po = 4W 0.01 % eNo Output Noise "A" Weighted Bw = 20Hz to 20KHz SVR Supply voltage rejection f = 100Hz; Vr = 1Vrms 50 70 dB fch High cut-off frequency PO = 0.5W 100 300 KHz Ri Input Impedance 80 100 Po Po max. Output power 35 50 100 120 μV μV KΩ 7/12 Electrical specifications Table 4. TDA7854 Electrical characteristics (continued) (Refer to the test and application diagram, VS = 14.4V; RL = 4Ω; Rg = 600Ω; f = 1KHz; Tamb = 25°C; unless otherwise specified). Symbol Parameter Test condition Min. Typ. Max. Unit 60 70 60 - dB dB CT Cross Talk f = 1KHz PO = 4W f = 10KHz PO = 4W ISB St-by current consumption VSt-By = 0 10 μA Ipin5 St-by pin current VSt-By = 1.2V to 2.65V ±1 μA VSB out St-by out threshold voltage (Amp: ON) VSB in St-by in threshold voltage (Amp: OFF) Mute attenuation POref = 4W 80 VM out Mute out threshold voltage (Amp: Play) 2.6 VM in Mute in threshold voltage (Amp: Mute) AM (Amp: Mute) Att ≥ 80dB; POref = 4W VAM in 2.65 1.2 90 6.8 V dB V 1.2 7 V V VS automute threshold (Amp: Play) Att < 0.1dB; PO = 0.5W Ipin23 V Muting pin current VMUTE = 1.2V (Sourced current) 7 VMUTE = 2.6V -5 7.5 8 V 12 18 μA 18 μA 0 1 μA 0.2 0.4 V CLIPPING DETECTOR CDLK Clip Det high leakage current Cd Off CDSAT Clip Det sat voltage DC On; ICD = 1mA CDTHD Clip Det THD level 1. Saturated square wave output 8/12 2 % TDA7854 Application hints 4 Application hints 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 10μF. 4.2 Input stage The TDA7854's inputs are ground-compatible and can stand very high input signals (± 8Vpk) 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. 4.3 Stand-by and muting R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noise. About 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. A direct connection to Vs of these two pins is admissible but a 470kOhm equivalent resistance should be present between the power supply and muting and stand-by pins. 4.4 Heatsink definition Under normal usage (4 Ohm speakers) the heatsink's thermal requirements have to be deduced from Figure 4, 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 = 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. Figure 4. Power dissipation vs. output power (RL = 4Ω, audio program simulation) Ptot (W) 30 Vs = 14.4 V RL = 4 x 4 Ω GAUSSIAN NOISE 25 CLIP START 20 15 10 5 0 1 2 3 Po (W) 4 5 6 AC00036 9/12 Package information 5 TDA7854 Package information In order to meet environmental requirements, ST offers this device in ECOPACK® packages. This package has a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 5. 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 L3 R L L1 V1 V2 R2 D R1 L5 Pin 1 R1 R1 E G G1 F FLEX25ME M M1 7034862 10/12 TDA7854 6 Revision history Revision history Table 5. Document revision history Date Revision 4-Oct-2007 1 Changes Initial release. 11/12 TDA7854 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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