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TDA7396
45W/2 BRIDGE CAR RADIO AMPLIFIER WITH DIAGNOSTIC FACILITY
HIGH POWER CAPABILITY: - 65W/2 MAX - 60W/2 EIAJ - 45W/2 @ 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 Diagnostic Facilities: CLIPPING DETECTOR Figure 1: Test And Application Circuit
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
+VS 0.22F IN+ 0.22F INSTANDBY TO C or VS 1 2 3 9 7 100nF OUT+ 1000F
TDA7396
5
OUT-
Vref 10K TO C
8 11 CM 10F 10 RS 51K 6 4 GND
CD-DIA
D93AU004
October 1998
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 2 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 apFigure 2: Block Diagram
VCC1 3 VCC2 9
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.
+ STANDBY THRESHOLD IN1
REFERENCES 10K
SHORT CIRCUIT DUMP & THERMAL PROTECTION
5 POWER AMP 500 ICM 500 COMMON MODE + V CC/2
OUT-
LTS
V=f (Tj)
LTS DISABLE
4 DIAGN CD 7
IN+
2
gm +
POWER AMP 10K THD DETECT
OUT+
+ MUTE THRESHOLD 11 MUTE
PROGRAMMABLE CURRENT CIRCUIT
DIAGNOSTIC CIRCUIT
10 SYNC
6 GND
8 STANDBY
D94AU107
PIN CONNECTION (Top view)
11 10 9 8 7 6 5 4 3 2 1 MUTE SYNC +VS STAND-BY OUT+ GND OUTCD-DIA (CLIPPING DETECTOR - DIAG.) +VS IN+ IN-
TAB CONNECTED TO PIN 6
D93AU003A
THERMAL DATA
Symbol Rth j-case 2/11 Description Thermal Resistance Junction-case Max Value 1.5 Unit C/W
TDA7396
ABSOLUTE MAXIMUM RATINGS
Symbol VS VOP VPEAK IO Ptot Tstg, Tj DC Supply Voltage Operating Supply Voltage Peak Supply Voltage (t = 50ms) Output Peak Current repetitive (f > 10Hz) Output Peak Current non repetitive Power Dissipation (T CASE = 85C) Storage and Junction-Case Parameter Value 28 18 50 6 7 43 -40 to 150 Unit V V V A A W C
ELECTRICAL CHARACTERISTICS (VS = 14.4V; RL = 2, f = 1KHz, Tamb = 25C, unless otherwise specified)
Symbol VS Iq VOS ISB ISBin VSBon VSBoff ATTST-BY R EXT/RS IM in AM PO Parameter Supply Voltage Range Total Quiescent Current Output Offset Voltage ST-BY Current ST-BY Input Bias Current ST-BY On Threshold Voltage ST-BY Off threshold Voltage ST-BY Attenuation Mute Resistor Ratio for External Mute Control Mute Input Bias Current Mute Attenuation RMS Output Power d = 10% d = 1% d = 10%; RL = 4 VS = 13.7V PO = 0.1 to 20W PO = 0.1 to 15W; R L = 4 25 PO = 1W; -3dB Differential Single Ended EIN CMRR SVR CDL T sd Input Noise Voltage Input Common Mode Rejection Supply Voltage Rejection Clipping Detection Level Absolute Thermal Shutdown Junction Temperature R g = 0 ; f = 22Hz to 22KHz f = 1KHz; VIN = 1Vrms R g = 0; Vr = 1Vrms 75 60 55 4 70 60 0.5 160 (see Application Circuit of fig. 4) VMUTE = 5V 90 45 35 27 60 0.06 0.03 26 27 0.63 3.5 90 0.69 10 VST-BY = 1.5V VST-BY = 5V Test Condition Min. 8 100 150 100 10 1.5 Typ. Max. 18 Unit V mA mV A A V V dB V A dB W W W W % % dB KHz K K mV dB dB % dB
EIAJ Output Power d GV fH R IN Distortion Voltage Gain High Frequency rolloff Input Impedance
3/11
TDA7396
FUNCTIONAL DESCRIPTION
Pin 1, 2 Function INPUTS 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. The output stage is a bridge type able to drive loads as high as 2. 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. 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 A). When the ST-BY pin is high the IC becomes fully operational. 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 REXT / RS in to order to reach the fixed limits 0.63 REXT / RS 0.69
4
CD - DIA
5, 7
OUTPUTS
8
STAND-BY
10
SYNC
11
MUTE
Figure 3: Application Circuit with External Mute Control
+VS 0.22F IN+ 0.22F INSTANDBY TO C or VS REXT TO C 1 2 3 9 7 100nF OUT+ 1000F
TDA7396
5
OUT-
Vref 10K TO C
8 11 10 RS 6 4 GND CM
CD-DIA
D93AU007
4/11
TDA7396
Figure 4: Quiescent Current vs Supply Voltage Figure 5: EIAJ power vs Supply Voltage
RL = 2
RL = 4
Figure 6: Output Power vs Supply Voltage (RL =2)
Figure 7: Distortion vs Frequency (RL =2)
R L = 2 f = 1KHz
VS = 14.4V R L = 2 PO = 18W
f (Hz)
Figure 8: Output Power vs Supply Voltage (RL =4)
Figure 9: Distortion vs Frequency (RL =4)
R L = 4 f = 1KHz
VS = 14.4V R L = 4 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 R L = 2 Rg = 0
VS = 14.4V Vcm = 1Vrms RL = 2 Rg = 0
f (Hz)
f (Hz)
Figure 12: TotalPower Dissipation & Efficiency vs. Output Power (RL = 2)
VS = 14.4V RL = 2 f = 1KHz
Figure 13: TotalPower Dissipation & Efficiency vs. OutputPower (RL = 4)
VS = 14.4V R L = 4 f = 1KHz
6/11
TDA7396
Figure 14: Application Circuit
+VS C2 0.22F IN+ C1 0.22F INJ1 VS SW1 ST-BY 8 11 10 R2 51K 6 1 2 3 9 7 C5 100nF OUT+ C4 1000F
TDA7396
5
OUT-
5V R3 100K TO C
4 GND
CD-DIA R1 15K C6 100nF
C3 10F
D93AU108
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 (140C) 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 160C (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
FAULT DIAGNOSTICS
NORMAL OPERATION
8/11
TDA7396
Figure 17: Thermal Protection & Diagnostic Waveforms
MAX OUTPUT VOLTAGE SWING
LINEAR THERMAL SHUT DOWN ABS THERMAL SHUTDOWN
0 140C 160C
DIAGNOSTICS OUTPUT (pin 4)
D93AU006A
9/11
TDA7396
DIM. MIN. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.4 17.25 10.3 2.65 4.25 4.73 1.9 1.9 3.65 17.5 10.7 4.55 5.08 22.2 22.1 0.49 0.88 1.45 16.75 19.6 20.2 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.43 2.6 2.6 3.85 0.862 0.854 0.685 0.679 0.406 0.104 0.167 0.186 0.075 0.075 0.144 0.689 0.421 0.179 0.200 0.874 0.87 1.7 17 1 0.55 0.95 1.95 17.25 0.019 0.035 0.057 0.659 0.772 0.795 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.214 0.102 0.102 0.152 0.067 0.669 mm TYP. MAX. 5 2.65 1.6 0.039 0.022 0.037 0.077 0.679 MIN. inch TYP. MAX. 0.197 0.104 0.063
OUTLINE AND MECHANICAL DATA
Multiwatt11 V
10/11
TDA7396
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 1998 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com
11/11

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