TDA7396 ® 45W/2Ω BRIDGE CAR RADIO AMPLIFIER WITH DIAGNOSTIC FACILITY HIGH POWER CAPABILITY: - 65W/2Ω MAX - 60W/2Ω EIAJ - 45W/2Ω @ VS = 14.4V, f = 1KHz, d = 10% DIFFERENTIAL INPUTS (EITHER SINGLE ENDED OR DIFFERENTIAL INPUT SIGNALS ARE ACCEPTED) MINIMUM EXTERNAL COMPONENT COUNT: - NO BOOTSTRAP CAPACITORS - NO BOUCHEROT CELLS - INTERNALLY FIXED GAIN (26dB) - NO SVR CAPACITOR ST.-BY FUNCTION (CMOS COMPATIBLE) AUTOMATIC MUTE DURING TURN-ON/OFF AUTOMUTE AT MINIMUM SUPPLY VOLTAGE DETECTION SYNCHRONIZING PIN FOR SIMULTANEOUS TURN-ON IN MULTI-DEVICE APPLICATIONS NO AUDIBLE POP DURING MUTE AND STBY OPERATIONS Multiwatt11 ORDERING NUMBER: TDA7396 SHORT CIRCUIT OPEN LOAD THERMAL SHUTDOWN PROTECTIONS: SHORT CIRCUIT (TO GND, TO VS, ACROSS THE LOAD) VERY INDUCTIVE LOADS CHIP OVER-TEMPERATURE LOAD DUMP OPEN GND ESD Diagnostic Facilities: CLIPPING DETECTOR Figure 1: Test And Application Circuit +VS 100nF 0.22µF IN+ 2 3 9 7 0.22µF IN- 1 STANDBY TO µC or VS 8 11 CM 10µF TDA7396 10 5 6 RS 51KΩ 4 1000µF OUT+ OUT- CD-DIA Vref 10KΩ TO µC GND D93AU004 September 2013 1/11 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. TDA7396 DESCRIPTION The TDA7396 is a BRIDGE class AB audio power amplifier especially intended for car radio High Power applications. The 2Ω power capability together with the possibility to operate either in DIFFERENTIAL INPUT MODE or SINGLE ENDED INPUT MODE makes it suitable for boosters and high end car radio ap- plications. The exclusive fully complementary output stage and the internally fixed gain configuration drop the external component count. The on board clipping detector allows easy implementation of gain compression systems. The diagnostics facility allows to detect any mistakes during car radio set assembly and wiring in the car. Figure 2: Block Diagram VCC2 VCC1 3 9 + - 10K STANDBY THRESHOLD IN- SHORT CIRCUIT DUMP & THERMAL PROTECTION REFERENCES 1 5 POWER AMP 500Ω ICM COMMON MODE - 500Ω V=f (Tj) LTS + LTS DISABLE 4 OUT- DIAGN CD VCC/2 IN+ - 2 POWER AMP gm + 7 OUT+ 10K THD DETECT PROGRAMMABLE CURRENT CIRCUIT + DIAGNOSTIC CIRCUIT MUTE THRESHOLD 11 MUTE 10 6 SYNC GND 8 STANDBY D94AU107 PIN CONNECTION (Top view) 11 MUTE 10 SYNC 9 +VS 8 STAND-BY 7 OUT+ 6 GND 5 OUT- 4 CD-DIA (CLIPPING DETECTOR - DIAG.) 3 +VS 2 IN+ 1 IN- TAB CONNECTED TO PIN 6 D93AU003A THERMAL DATA Symbol Rth j-case 2/11 Description Thermal Resistance Junction-case Max Value Unit 1.5 °C/W TDA7396 ABSOLUTE MAXIMUM RATINGS Symbol VS VOP VPEAK IO Ptot Tstg, Tj Parameter Value Unit DC Supply Voltage Operating Supply Voltage 28 18 V V Peak Supply Voltage (t = 50ms) 50 V Output Peak Current repetitive (f > 10Hz) Output Peak Current non repetitive 6 7 A A 43 -40 to 150 °C Power Dissipation (TCASE = 85°C) Storage and Junction-Case W ELECTRICAL CHARACTERISTICS (VS = 14.4V; RL = 2Ω, f = 1KHz, Tamb = 25°C, unless otherwise specified) Symbol Parameter VS Iq Supply Voltage Range VOS Output Offset Voltage Test Condition ST-BY Current ST-BY Input Bias Current ST-BY On Threshold Voltage VSBoff ST-BY Off threshold Voltage VST-BY = 1.5V VST-BY = 5V IM in AM Mute Input Bias Current VMUTE = 5V PO RMS Output Power d = 10% d = 1% d = 10%; RL = 4Ω EIAJ Output Power VS = 13.7V PO = 0.1 to 20W PO = 0.1 to 15W; RL = 4Ω Voltage Gain fH RIN High Frequency rolloff Input Impedance EIN CDL Tsd mA 150 mV 100 10 1.5 µA µA V 0.69 dB V V 0.63 90 µA dB 45 35 27 W W W 60 0.06 0.03 26 W % % dB 10 25 PO = 1W; -3dB Differential Single Ended CMRR SVR V 90 Mute Attenuation GV Unit 18 3.5 (see Application Circuit of fig. 4) Distortion Max. 100 ST-BY Attenuation Mute Resistor Ratio for External Mute Control d Typ. 8 Total Quiescent Current ISB ISBin VSBon ATTST-BY REXT/RS Min. 75 27 60 KHz KΩ 55 KΩ Input Noise Voltage Rg = 0Ω ; f = 22Hz to 22KHz 4 µV Input Common Mode Rejection Supply Voltage Rejection f = 1KHz; VIN = 1Vrms Rg = 0Ω; Vr = 1Vrms 70 60 dB dB 0.5 160 % dB Clipping Detection Level Absolute Thermal Shutdown Junction Temperature 3/11 TDA7396 FUNCTIONAL DESCRIPTION Pin Function 1, 2 INPUTS 4 CD - DIA Description The input stage is a high impedance differential type also capable of operation in single ended mode with one input capacitively coupled to the signal GND. the impedance seen by the inverting and non inverting input pins must be matched. The TDA7396 is equipped with a diagnostics circuitry able to detect the following events: - Clipping in the Output Signal - Thermal Shutdown - Open Load (before turn-on) - Shorted Output: to GND, to Vs, across the load (after turn-on) The CD-DIA(open collector) pin gives out the diagnostics signal (low during clipping or output fault condition). The device does not work as long as the faulty condition holds; the normal operation is automatically restored after the fault removal. OUTPUTS The output stage is a bridge type able to drive loads as high as 2Ω. It consists of two class AB fully complementary PNP/NPN stages fully protected. A rail to rail output voltage swing is achieved with no need of bootstrap capacitors. No external compensation is necessary. 8 STAND-BY The device features a ST-BY function which shuts down all the internal bias supplies when the ST-BY input is low. In ST-BY mode the amplifier sinks a small current (in the range of few µA). When the ST-BY pin is high the IC becomes fully operational. 10 SYNC 11 MUTE 5, 7 A resistor (RS) has to be connect between pin 10 and GND in order to program the current that flows into CM capacitor (pin 11). The values of CM and RS determine the time required to bias the amplifier. a) The pin will have a capacitor (CM) tied to GND to set the MUTE/STAND-BY time. An automatic Mute during turn on/off is provided to prevent noisy transients b) If a independent Mute function is needed, an external transistor circuit (see fig. 4) may be connected to this pin; 1% precision resistors have to be used for R EXT / RS in to order to reach the fixed limits 0.63 ≤ REXT / RS ≤ 0.69 Figure 3: Application Circuit with External Mute Control +VS 100nF 0.22µF IN+ 2 3 9 7 0.22µF IN- 1 STANDBY TO µC or VS 8 REXT TDA7396 10 11 5 6 4 1000µF OUT+ OUT- CD-DIA Vref 10KΩ TO µC GND TO µC CM RS D93AU007 4/11 TDA7396 Figure 4: Quiescent Current vs Supply Voltage Figure 5: EIAJ power vs Supply Voltage RL = 2Ω RL = 4Ω Figure 6: Output Power vs Supply Voltage (RL =2Ω) RL = 2Ω f = 1KHz Figure 7: Distortion vs Frequency (RL =2Ω) VS = 14.4V RL = 2Ω PO = 18W f (Hz) Figure 8: Output Power vs Supply Voltage (RL =4Ω) RL = 4Ω f = 1KHz Figure 9: Distortion vs Frequency (RL =4Ω) VS = 14.4V RL = 4Ω PO = 15W f (Hz) 5/11 TDA7396 Figure 10: Supply Voltage Rejection vs Frequency Figure 11: Common Mode Rejection vs. Frequency VS = 14.4V Vr = 1Vrms RL = 2Ω Rg = 0 f (Hz) Figure 12: Total Power Dissipation & Efficiency vs. Output Power (RL = 2Ω) VS = 14.4V Vcm = 1Vrms RL = 2Ω Rg = 0 f (Hz) Figure 13: Total Power Dissipation & Efficiency vs. Output Power (RL = 4Ω) VS = 14.4V RL = 2Ω f = 1KHz VS = 14.4V RL = 4Ω f = 1KHz 6/11 TDA7396 Figure 14: Application Circuit +VS C5 100nF C2 0.22µF IN+ 2 3 9 7 C1 0.22µF IN- 1 J1 VS SW1 ST-BY C3 10µF 8 11 TDA7396 10 5 6 R2 51KΩ D93AU108 4 C4 1000µF OUT+ OUT- 5V CD-DIA R3 100KΩ TO µC R1 15KΩ GND C6 100nF Figure 15: P.C. Board and Component Layout (1:1 scale) 7/11 TDA7396 CLIPPING DETECTION & DIAGNOSTICS (see fig. 16) An active pull-down circuit is provided to signal out the occurrence of any of the conditions described later. In order to use this function, the CDDIA pin (#4) has to be resistively connected to a positive voltage reference (between 5V and Vs). A) Clipping Detection Current is sunk whenever the output clipping distortion level reaches a fixed 0.5% threshold; this function allows gain compression facility when the amplifier is overdriven. B) Output Fault Diagnostics Current is sunk as soon as one of the following output faults is recognized: - short-circuit to GND - short-circuit to Vs - short-circuit across the load (after turn-on) - open load (before turn-on) The diagnostics signal remains steadily on until the fault is removed. All the output fault conditions (listed above) can be distinguished from the clipping detection (A) because of their different time duration. THERMAL WARNING (see fig. 17) Thermal protection has been implemented in accordance to a new principle involving different steps: 1) Thermal foldback (Linear Thermal Shutdown) 2) Shutdown with soft restart (Absolute Thermal Shutdown) As long as the junction temperature remains below the preset threshold (140°C) the IC delivers the full power. Once the threshold has been reached, a thermal foldback starts limiting the output signal level; the output power is then reduced, thus decreasing also the temperature without output signal interruption (LTS). Supposing the thermal foldback does not reduce the junction temperature to a safe level, a complete shutdown will occur at 160°C (ATS). Soft restart avoids large voltage disturbance across the loudspeaker, due to the presence of high input signals when the IC comes out of thermal shutdown. Current is sunk from the CD-DIA pin (#4)when the thermal protection is acting. The voltage at pin #4 bounces back and forth (depending on the amplifier input signal magnitude) during the linear thermal intervention (LTS) and stays low (sinking current) after the amplifier has been eventually shut-down (Absolute Thermal Shutdown) Figure 16: Clipping Detection & Diagnostics Waveforms Vo CLIPPING S/C TO GND CLIPPING DETECTOR/ DIAGNOSTICS OUTPUT (pin 4) 0 D93AU005A NORMAL OPERATION 8/11 FAULT DIAGNOSTICS NORMAL OPERATION TDA7396 Figure 17: Thermal Protection & Diagnostic Waveforms MAX OUTPUT VOLTAGE SWING LINEAR THERMAL SHUT DOWN ABS THERMAL SHUTDOWN 0 140˚C 160˚C DIAGNOSTICS OUTPUT (pin 4) D93AU006A 9/11 TDA7396 mm DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 5 0.197 B 2.65 0.104 C 1.6 D 0.063 1 E 0.49 0.039 0.55 0.019 0.022 F 0.88 0.95 0.035 G 1.45 1.7 1.95 0.057 0.067 0.077 G1 16.75 17 17.25 0.659 0.669 0.679 H1 19.6 0.037 0.772 H2 20.2 0.795 L 21.9 22.2 22.5 0.862 0.874 0.886 L1 21.7 22.1 22.5 0.854 0.87 0.886 L2 17.4 18.1 0.685 L3 17.25 17.5 17.75 0.679 0.689 0.699 L4 10.3 10.7 10.9 0.406 0.421 0.429 L7 2.65 2.9 0.104 0.713 0.114 M 4.25 4.55 4.85 0.167 0.179 0.191 M1 4.73 5.08 5.43 0.186 0.200 0.214 S 1.9 2.6 0.075 0.102 S1 1.9 2.6 0.075 0.102 Dia1 3.65 3.85 0.144 0.152 10/11 OUTLINE AND MECHANICAL DATA Multiwatt11 V TDA7396 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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