TDA7396
45W/2Ω BRI DGE CAR RADIO AMPLIFIER
WITH DIAGNO STIC FA CILITY
HIG H POWER CAPABIL IT Y:
- 65W/2Ω MA X
- 60W/2Ω EIAJ
- 45W/2Ω @ VS = 14.4V, f = 1KHz, d = 10%
DIFFERENTIAL INPUTS (EITHER SINGLE
ENDED OR DIFFERENTIAL INPUT SIGNALS
ARE ACCEPT ED)
MINIMUM EXTERNAL COMPONENT COUNT:
- NO BOOTSTRAP CAPA CITORS
- NO BOUCHEROT CELLS
- INTERNALLY FIXED GAIN (26dB)
- NO SV R CAPACITOR
ST.- BY FUNC TION (C MOS COMPA TIBLE)
AUTO MAT IC MUTE DURING TURN-ON /OFF
AUTO MU T E AT MIN I MU M SUPP LY
VOLTAG E DETECT ION
SYNCHRONIZING PIN FOR SIMULTANEOUS
TURN-ON IN MULTI-DEVICE APPLICATIONS
NO AUDIBLE POP DURING MUTE AND ST-
BY OPERATIONS
Diagnostic Facilities:
CLIPPIN G D ETE CTOR
SHORT CIRCUIT
OPEN LOAD
THERMAL SHUTDOWN
PROTECTIONS:
SHORT CIRCUIT (TO GND, TO VS, A CROSS
THE LOAD )
VERY INDUCTIVE LOADS
CHIP OVER-TEMPERATURE
LOAD DUMP
OPEN GND
ESD
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
April 2002
®
1
2
11
IN-
0.22µF
0.22µF
IN+
8
STANDBY
TO µC or VS10 6
OUT+
OUT-
7
5
4
Vref
CD-DIA
TDA7396
D93AU004
10KΩ
1000µF
GND
RS
51KΩ
CM
10µF
100nF
39
TO µC
+VS
Figure 1: Test And Application Circuit
Multiwatt11
ORDERING NUMBER: TDA7396
1/11
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 possi-
bility to operate either in DIFFERENTIAL INPUT
MODE or SINGLE ENDED INPUT MODE makes
it suitable for boost ers 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 imple-
mentation of gain compression systems.
The diagnostics facility allows to detect any mis-
takes during car radio set assembly and wiring in
the car.
+
-
39
V
CC1
V
CC2
REFERENCES
STANDBY THRESHOLD
SHORT CIRCUIT
DUMP & THERMAL
PROTECTION
ICM
1
2
500Ω
500Ω
COMMON
MODE -
+
V
CC/2
-
+gm
+
-
MUTE THRESHOLD
PROGRAMMABLE
CURRENT CIRCUIT DIAGNOSTIC
CIRCUIT
10K
10K
LTS V=f
(Tj)
POWER AMP
POWER AMP
THD
DETECT
LTS
DISABLE
1011 8
5
4
7
IN-
IN+
OUT-
DIAGN
CD
OUT+
6
MUTE SYNC GND STANDBY
D94AU107
Figure 2: Block Diagram
THERMAL DATA
Symbol Description Value Unit
Rth j-case Thermal Resistance Junction-case Max 1.5 °C/W
1
2
3
4
5
6
7
D93AU003A
9
10
11
8
MUTE
SYNC
+VS
STAND-BY
OUT+
GND
OUT-
CD-DIA (CLIPPING DETECTOR - DIAG.)
+VS
IN+
IN-
TAB CONNECTED TO PIN 6
PIN C ONNECTION (Top view)
TDA7396
2/11
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
VSDC Supply Voltage 28 V
VOP Operating Supply Voltage 18 V
VPEAK Peak Supply Voltage (t = 50ms) 50 V
IOOutput Peak Current repetitive (f > 10Hz)
Output Peak Current non repetitive 6
7A
A
Ptot Power Dissipation (TCASE = 85°C) 43 W
Tstg, TjStorage and Junction-Case -40 to 150 °C
ELECTRICAL CHARACTERISTICS (VS = 14.4V; RL = 2Ω, f = 1KHz, Tamb = 25°C, unless otherwise
specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
VSSupply Voltage Range 8 18 V
IqTotal Quiescent Current 100 mA
VOS Output Offset Voltage 150 mV
ISB ST-BY Current VST-BY = 1.5V 100 µA
ISBin ST-BY Input Bias Current VST-BY = 5V 10 µA
VSBon ST-BY On Threshold Voltage 1.5 V
VSBoff ST-BY Off threshold Voltage 3.5 V
ATTST-BY ST-BY Attenuation 90 dB
REXT/RSMute Resistor Ratio for External
Mute Control (see Application Circuit of fig. 4) 0.63 0.69 V
IM in Mute Input Bias Current VMUTE = 5V 10 µA
AMMute Attenuation 90 dB
PORMS Output Power d = 10%
d = 1%
d = 10%; RL = 4Ω
45
35
27
W
W
W
EIAJ Output Power VS = 13.7V 60 W
d Distortion PO = 0.1 to 20W
PO = 0.1 to 15W; RL = 4Ω0.06
0.03 %
%
GVVoltage Gain 25 26 27 dB
fHHigh Frequency rolloff PO = 1W; -3dB 75 KHz
RIN Input Impedance Differential 60 KΩ
Single Ended 55 KΩ
EIN Input Noise Voltage Rg = 0Ω ; f = 22Hz to 22KHz 4 µV
CMRR Input Common Mode Rejection f = 1KHz; VIN = 1Vrms 70 dB
SVR Supply Voltage Rejection Rg = 0Ω; Vr = 1Vrms 60 dB
CDL Clipping Detection Level 0.5 %
Tsd Absolute Thermal Shutdown
Junction Temperature 160 dB
TDA7396
3/11
FUNCTIONAL DESCRIPTION
Pin Function Description
1, 2 INPUTS 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.
4 CD - DIA
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.
5, 7 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 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.
11 MUTE
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
1
2
11
IN-
0.22µF
0.22µF
IN+
8
STANDBY
TO µC or VS10 6
OUT+
OUT-
7
5
4
Vref
CD-DIA
TDA7396
D93AU007
10KΩ
1000µF
GND
RS
CM
100nF
39
TO µC
+VS
REXT
TO µC
Figure 3: Application Circuit with External Mute Control
TDA7396
4/11
Figure 4: Quiescent Current vs Supply Voltage Figure 5: EIAJ power vs Supply Voltage
Figure 6: Output Power vs Supply Voltage (RL =2Ω)Figure 7: Distortion vs Frequency (RL =2Ω)
Figure 8: Output Power vs Supply Voltage (RL =4Ω)Figure 9: Distortion vs Frequency (RL =4Ω)
RL = 2Ω
RL = 4Ω
RL = 2Ω
f = 1KHz
VS = 14.4V
RL = 2Ω
PO = 18W
f (Hz)
VS = 14.4V
RL = 4Ω
PO = 15W
RL = 4Ω
f = 1KHz
f (Hz)
TDA7396
5/11
Figure 10: Supply Voltage Rejection vs Fre-
quency Figure 11: C ommon Mode Rejection vs. Fre-
quency
Figure 12: T otal Pow er Dissip ation & Efficien cy vs.
Output Power (RL = 2Ω)F igure 13: Total Power Dissipation & Efficiency vs.
Output Power (RL = 4Ω)
f (Hz)
f (Hz)
VS = 14.4V
RL = 4Ω
f = 1KHz
VS = 14.4V
RL = 2Ω
f = 1KHz
VS = 14.4V
Vr = 1Vrms
RL = 2Ω
Rg = 0
VS = 14.4V
Vcm = 1Vrms
RL = 2Ω
Rg = 0
TDA7396
6/11
1
2
11
IN-
C2 0.22µF
C1 0.22µF
IN+
8
ST-BY 10 6
OUT+
OUT-
7
5
4
5V
CD-DIA
TDA7396
D93AU108
R3
100KΩ
C4 1000µF
GND
R2
51KΩ
C3
10µF
C5 100nF
39
TO µC
+VS
VS
SW1
J1
R1 15KΩ
C6
100nF
Figure 14: A pplication Circuit
Figure 15: P.C. Board and Component Layout (1:1 scale)
TDA7396
7/11
CLIPPING DE TECTION & DIAGNOSTICS
(see fig. 16)
An active pull-down circuit is provided to signal
out the occurrence of any of the conditions de-
scribed later. In order to use this function, the CD-
DIA 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 dis-
tortion level reaches a fixed 0.5% threshold; this
function allows gain c ompression f acility 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 W ARNING (see fig. 17)
Thermal protection has been implemented in ac-
cordance 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 be-
low the preset threshold (140°C) the IC delivers
the full power. Once the threshold has been
reached, a thermal foldback starts limiting the out-
put signal level; the out put power is then reduced,
thus decreasing also the temperature without out-
put signal interruption (LTS). Supposing the ther-
mal foldback does not reduce the junction tem-
perature to a safe level, a complet e 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 t he IC comes out of ther-
mal shutdown.
Current is sunk from the CD- DIA pin ( #4)when the
thermal protection is acting. T he voltage at pin #4
bounces back and forth (depending on the ampli-
fier input signal magnitude ) during t he linear t her-
mal intervention (LTS) and stays low (sinking cur-
rent) after the amplifier has been eventually
shut-down (Absolute Thermal Shutdown)
D93AU005A
CLIPPING
DETECTOR/
DIAGNOSTICS
OUTPUT
(pin 4)
Vo
0
CLIPPING S/C TO GND
NORMAL OPERATION FAULT DIAGNOSTICS NORMAL OPERATION
Figure 16: Clipping Detection & Diagnostics Waveforms
TDA7396
8/11
D93AU006A
0
DIAGNOSTICS
OUTPUT
(pin 4)
LINEAR
THERMAL
SHUT DOWN ABS THERMAL
SHUTDOWN
140˚C 160˚C
MAX OUTPUT
VOLTAGE
SWING
Figure 17: T hermal Protection & Diagnostic Waveforms
TDA7396
9/11
Multiwatt11 V
DIM. mm inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 5 0.197
B 2.65 0.104
C 1.6 0.063
D 1 0.039
E 0.49 0.55 0.019 0.022
F 0.88 0.95 0.035 0.037
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 0.772
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 0.713
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 0.114
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
OUTLINE AND
MECHANICAL DATA
TDA7396
10/11
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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
grante d by implication or other wise under any paten t or patent righ ts of STMicr oelectronics. Specification m entioned in this publication are
subj ect to change without notic e. This public ation supers edes and rep laces all informat ion p reviously supplied. STMic roelec tronic s products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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TDA7396
11/11
