TDA7388A 4 x 42W quad bridge car radio amplifier Preliminary Data Features ■ High output power capability: – 4 x 42W/4Ω max. – 4 x 27W/4Ω @ 14.4V, 1KHz, 10% ■ Low 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 ■ Fortuitous open gnd ■ Clipping detector ■ Output DC offset detector ■ Offset detector ■ Reversed battery ■ Diagnostic facility for: – Out to GND short – Out to VS short – Thermal shutdown ■ ESD Flexiwatt27 Description The TDA7388A is a new technology class AB audio power amplifier in Flexiwatt 27 package designed for high end car radio applications. Protections: ■ Output short circuit to gnd, to VS, across the load ■ Very inductive loads ■ Overrating chip temperature with soft thermal limiter ■ Load dump voltage Table 1. Thanks to the fully complementary PNP/NPN output configuration the TDA7388A allows a rail to rail output voltage swing with no need of bootstrap capacitors. The extremely reduced components count allows very compact sets. The TDA7388A is also equipped with Clipping detector and Offset detector features. Device summary Order code Package Packing TDA7388A Flexiwatt27 Tube December 2007 Rev 1 This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. 1/13 www.st.com 1 Contents TDA7388A Contents 1 Pins connection and test/application diagrams . . . . . . . . . . . . . . . . . . . 5 2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 Stand-by and Muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2/13 TDA7388A List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3/13 List of figures TDA7388A 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. 4/13 Pins connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Standard test and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Output power vs. supply voltage (4 Ohm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Distortion vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Distortion vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Output noise vs. source resistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Power dissipation & efficiency vs. output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . . 9 Flexiwatt27 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 TDA7388A Pins connection and test/application diagrams Pins connections 27 CD 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- P-GND2 TAB 1 TAB Figure 1. OFF.DET 1 Pins connection and test/application diagrams FLEX27_O Figure 2. Standard test and application circuit OFFSET DETECTOR C8 0.1μF R4 C7 2200μF Vcc1-2 7 R1 47K Vcc3-4 2 21 5 ST-BY 10K R2 10 C9 1μF 9 23 MUTE 47K C10 1μF 6 C1 4 0.1μF 13 IN2 18 C2 0.1μF OUT3 19 IN3 20 16 C3 0.1μF 22 25 15 IN4 C4 0.1μF OUT2 3 12 IN1 OUT1 8 S-GND 14 17 C5 0.47μF OUT4 24 11 C6 47μF SVR 26 1, 27 CD TAB R3 47K V D05AU1614MOD1 CD OUT 5/13 Electrical specifications TDA7388A 2 Electrical specifications 2.1 Absolute maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit Operating supply voltage 18 V VS (DC) DC supply voltage 28 V VS (pk) Peak supply voltage (t = 50ms) 50 V Output peak current: Repetitive (duty cycle 10% at f = 10Hz) Non repetitive (t = 100μs) 4.5 5.5 A A Power dissipation, (Tcase = 70°C) 80 W Tj Junction temperature 150 °C Tstg Storage temperature – 55 to 150 °C VS IO Ptot 2.2 Thermal data Table 3. Thermal data Symbol Rth j-amb Parameter Thermal resistance junction to ambient max. Value Unit 1 °C/W 2.3 Electrical characteristics Table 4. Electrical characteristics (VS = 14.4V; f = 1KHz; Rg = 600Ω; RL = 4Ω;Tamb = 25°C; Refer to the test and application diagram (Figure 2), unless otherwise specified.) Symbol Parameter Test condition Quiescent current RL = ∞ VOS Output offset voltage Play mode dVOS During mute ON/OFF output offset voltage ITU R-ARM weighted see Figure 11 During St-By ON/OFF output offset voltage Iq1 Gv Voltage gain ΔGv Channel gain unbalance Po Po max 6/13 Min. Typ. Max. Unit 100 190 350 mA ±100 mV -10 +10 mV -50 +50 mV 27 dB ±1 dB 25 26 Output power THD = 10%; VS = 14.4V 25 27 W Max.output power(1) VS = 14.4V 39 42 W TDA7388A Table 4. Electrical specifications Electrical characteristics (continued) (VS = 14.4V; f = 1KHz; Rg = 600Ω; RL = 4Ω;Tamb = 25°C; Refer to the test and application diagram (Figure 2), unless otherwise specified.) Symbol Parameter Test condition Min. Typ. Max. Unit 0.04 0.10 % "A" Weighted 50 70 μV Bw = 20Hz to 20KHz 70 100 μV THD Distortion Po = 4W eNo Output noise SVR Supply voltage rejection f = 100Hz; Vr = 1Vrms 50 65 dB fch High cut-off frequency Po = 0.5W 100 200 KHz Ri Input Impedance 70 100 KΩ 60 70 dB CT Cross talk 60 dB ISB St-By current consumption VSt-By = 0V 20 μA Ipin4 St-By pin current VSt-By = 1.2 to 2.6V ±10 μA f = 1KHz; Po = 4W f = 10KHz; Po = 4W VSB out St-By OUT threshold voltage (Amp: ON) VSB IN St-By IN threshold voltage (Amp: OFF) Mute attenuation POref = 4W AM 2.6 V 1.2 80 90 V dB VM out Mute OUT threshold voltage (Amp: Play) 2.6 V VM in Mute IN threshold voltage (Amp: Mute) 1.2 V VAM in VS automute threshold (Amp: Mute); Att ≥ 80dB; POref = 4W (Amp: Play); Att < 0.1dB; PO = 0.5W 7.6 6.5 8.5 V V Ipin22 Muting pin current VMUTE = 1.2V (Source current) 5 11 20 μA ±1.4 ±2 ±2.6 V 10 µA Offset detector Voff Detected diff. output offset VST-BY =5V VOFF LK VOFF high leakage current OD off VOFF SAT VOFF det saturation voltage OD on; IOD = 1mA 300 mV Clipping detector CDLK Clip det high leakage current CD Off CDSAT Clip det sat voltage CDTHD Clip det THD level DC On; ICD = 1mA 10 μA 300 mV 0.2 % 1. Saturated square wave output. 7/13 Electrical specifications TDA7388A 2.4 Electrical characteristic curves Figure 3. Quiescent current vs. supply voltage Figure 4. Id (mA) Output power vs. supply voltage (4 Ohm) Po (W) 200 45 190 40 Vin = 0 RL = 4 Ω RL= 4Ω f= 1 KHz 35 180 THD = 10% 30 25 170 20 160 THD = 1% 15 150 10 5 140 8 10 12 14 16 Vs (V) Figure 5. 18 Distortion vs. output power 9 10 11 12 13 14 15 Vs (V) Figure 6. THD (%) 10 8 AC00531 10 16 17 18 AC00532 Distortion vs. frequency THD (%) Vs = 14.4V RL = 4Ω Po = 4W Vs = 14.4V RL = 4Ω 1 1 f = 10 KHz 0.1 0.1 f = 1 KHz 0.01 0.1 1 10 100 Po (W) Figure 7. 100 AC00533 Supply voltage rejection vs. frequency 100 90 1000 10000 f (Hz) Figure 8. SVR (dB) 100 0.01 10 100000 AC00534 Crosstalk vs. frequency SVR (dB) 90 80 80 70 70 60 60 50 50 Rg = 600Ω Vripple = 1 Vrms 40 40 30 20 10 100 1000 f (Hz) 8/13 10000 100000 AC00535 30 10 RL = 4Ω Po = 4W Rg = 600Ω 100 1000 f (Hz) 10000 100000 AC00536 TDA7388A Figure 9. Electrical specifications Output noise vs. source resistance Figure 10. Power dissipation & efficiency vs. output power En (µV) 180 Vs = 14.4V RL = 4Ω 160 140 η Vs = 13.2V RL = 4 x 4Ω f = 1 KHz 70 60 120 η (%) Pdiss (W) 80 80 70 60 50 50 100 40 22-22K Hz lin 80 40 Pdiss 30 30 20 20 20 10 10 0 0 60 40 "A" wgtd 1 10 100 1000 Rg (Ω) 10000 AC00537 0 2 4 6 8 10 12 14 16 18 20 22 0 24 Po (W) Figure 11. ITU R-ARM frequency response, weighting filter for transient pop 10 Output attenuation (dB) 0 -10 -20 -30 -40 -50 10 100 1000 Hz 10000 100000 AC00343 9/13 Application hints 3 TDA7388A Application hints Ref. to the circuit of Figure 2. 3.1 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. 3.2 Input stage The TDA7388A’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. 3.3 Stand-by and Muting Stand-by and Muting facilities are both 3.3V CMOS-COMPATIBLE. If unused, a straight connection to Vs of their respective pins would be admissible. Conventional/low-power transistors can be employed to drive muting and stand-by pins in absence of true CMOS ports or microprocessors. R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noises. Since a DC current of about 10µA normally flows out of pin 23, the maximum allowable muting-series resistance (R2) is 70KΩ, which is sufficiently high to permit a muting capacitor reasonably small (about 1µF). If R2 is higher than recommended, the involved risk will be that the voltage at pin 23 may rise to above the 1.5V threshold voltage and the device will consequently fail to turn OFF when the mute line is brought down. 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. 10/13 TDA7388A Package information In order to meet environmental requirements, ST (also) offers these devices in ECOPACK® packages. ECOPACK® packages are lead-free. 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 12. Flexiwatt27 mechanical data and package dimensions DIM. MIN. 4.45 1.80 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 0.75 0.37 0.80 25.75 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 26.00 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 26.25 29.30 0.029 0.014 0.031 1.014 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 1.023 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 1.033 1.153 0.904 0.762 0.626 0.313 0.169 0.173 5˚ (Typ.) 3˚ (Typ.) 20˚ (Typ.) 45˚ (Typ.) Flexiwatt27 (vertical) (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 4 Package information L L1 V1 V2 R2 D R1 L5 Pin 1 R1 R1 E G G1 F FLEX27ME M M1 7139011 11/13 Revision history 5 TDA7388A Revision history Table 5. 12/13 Document revision history Date Revision 6-Dec-2007 1 Changes Initial release. TDA7388A 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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