Datasheet TDA7396 Datasheet (SGS Thomson Microelectronics)



45W/2Ω BRIDGECAR RADIO AMPLIFIER

HIGHPOWER CAPABILITY:

- 65W/2ΩMAX

- 60W/2ΩEIAJ

- 45W/2Ω @V
DIFFERENTIAL INPUTS (EITHER SINGLE

ENDED OR DIFFERENTIAL INPUT SIGNALS
ARE ACCEPTED)

MINIMUMEXTERNALCOMPONENTCOUNT:

- NO BOOTSTRAPCAPACITORS

- NO BOUCHEROT CELLS

- INTERNALLYFIXEDGAIN (26dB)

- NO SVR CAPACITOR
ST.-BYFUNCTION (CMOS COMPATIBLE)
AUTOMATIC MUTE DURING TURN-ON/OFF
AUTOMUTEATMINIMUMSUPPLY

VOLTAGEDETECTION
SYNCHRONIZING PIN FOR SIMULTANEOUS

TURN-ONIN MULTI-DEVICEAPPLICATIONS
NO AUDIBLE POP DURING MUTE AND ST-

BY OPERATIONS

DiagnosticFacilities:

CLIPPINGDETECTOR

Figure 1: Test And ApplicationCircuit

S= 14.4V,f = 1KHz,d = 10%

TDA7396

WITH DIAGNOSTICFACILITY

Multiwatt11

ORDERING NUMBER: TDA7396

SHORTCIRCUIT
OPENLOAD
THERMALSHUTDOWN

PROTECTIONS:

SHORT CIRCUIT (TO GND, TO V
THELOAD)

VERYINDUCTIVE LOADS
CHIP OVER-TEMPERATURE
LOADDUMP
OPENGND
ESD

ACROSS

S,

+V

S

1000µF

Vref

10KΩ

TO µC

7

5

4

GND

100nF

OUT+

OUT-

CD-DIA

0.22µF
39

CM

10µF

2

1

8

11

TDA7396

10 6

RS

51KΩ

IN+

0.22µF

IN-

STANDBY

TO µCorV

October 1998

This is advanced informationon a new product now in development or undergoing evaluation. Details are subject to change without notice.

S

D93AU004

1/11

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 boostersand high end car radio ap-

Figure 2:

BlockDiagram

STANDBYTHRESHOLD

1

IN-

2

IN+

V

CC1VCC2

39

+

-

ICM

500Ω

500Ω

-

+

gm

REFERENCES

10K

COMMON

MODE

-

+

V

CC/2

10K

plications.
The exclusive fully complementary output stage
and the internallyfixed gain configurationdrop the
externalcomponent count.
The on board clipping detector allows easy imple­mentationof gain compressionsystems.
The diagnostics facility allows to detect any mis­takes during car radio set assembly and wiring in
the car.

CIRCUIT

SHORT

DUMP &

THERMAL

PROTECTION

5

POWER AMP

LTS

POWER AMP

DETECT

THD

V=f
(Tj)

LTS

DISABLE

OUT-

4

DIAGN

CD

7

OUT+

+

-

MUTE THRESHOLD

MUTE SYNC GND STANDBY

PIN CONNECTION (Topview)

TAB CONNECTED TO PIN 6

THERMAL DATA

PROGRAMMABLE

CURRENT CIRCUIT

1011 8

11
10

DIAGNOSTIC

CIRCUIT

6

D94AU107

MUTE

SYNC
9
8
7
6
5
4
3
2
1

D93AU003A

+V

S

STAND-BY

OUT+

GND

OUT-

CD-DIA (CLIPPING DETECTOR - DIAG.)

+V

S

IN+

IN-

Symbol Description Value Unit

R

th j-case

Thermal Resistance Junction-case Max 1.5

2/11

C/W

°

TDA7396

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

V

V

PEAK

P

T

stg,Tj

OP

I

O

tot

DC Supply Voltage 28 V

S

Operating Supply Voltage 18 V
Peak Supply Voltage (t = 50ms) 50 V
Output Peak Current repetitive (f > 10Hz)

Output Peak Current non repetitive
Power Dissipation (T

=85°C) 43 W

CASE

6
7

Storage and Junction-Case -40 to 150 °C

A
A

ELECTRICAL CHARACTERISTICS (VS= 14.4V; RL=2Ω, f = 1KHz, T

=25°C, unless otherwise

amb

specified)

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

S

I

q

V

OS

I

SB

I

SBin

V

SBon

V

SBoff

ATT

ST-BY

R

EXT/RS

I

Min

A

M

P

O

d Distortion P

G

V

f

H

R

IN

E

IN

CMRR Input Common Mode Rejection f = 1KHz; V

SVR Supply Voltage Rejection R

CDL Clipping Detection Level 0.5 %

T

sd

Supply Voltage Range 8 18 V
Total Quiescent Current 100 mA
Output Offset Voltage 150 mV
ST-BY Current V
ST-BY Input Bias Current V

= 1.5V 100 µA

ST-BY

=5V 10 µA

ST-BY

ST-BY On Threshold Voltage 1.5 V
ST-BY Off threshold Voltage 3.5 V
ST-BY Attenuation 90 dB
Mute Resistor Ratio for External

(see Application Circuit of fig. 4) 0.63 0.69 V

Mute Control
Mute Input Bias Current V

=5V 10

MUTE

Mute Attenuation 90 dB
RMS Output Power d = 10%

d=1%
d = 10%; R

EIAJ Output Power V

= 13.7V 60 W

S

= 0.1 to 20W

O

P

= 0.1 to 15W; RL=4Ω

O

=4Ω

L

45
35
27

0.06

0.03
Voltage Gain 25 26 27 dB
High Frequency rolloff PO= 1W; -3dB 75 KHz
Input Impedance Differential 60 K

Single Ended 55 K

Input Noise Voltage Rg=0Ω;f= 22Hz to 22KHz 4 mV

= 1Vrms 70 dB

IN

=0Ω;Vr= 1Vrms 60 dB

g

Absolute Thermal Shutdown

160 dB

Junction Temperature

A

µ

W
W
W

%
%

Ω
Ω

3/11

TDA7396

FUNCTIONAL DESCRIPTION

Pin Function Description

1, 2 INPUTS

4 CD - DIA

5, 7 OUTPUTS

8 STAND-BY

10 SYNC

11 MUTE

The input stage is a high impedance differential type also capable of operation in single
ended mode with one input capacitively coupled to the signalGND. 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 (afterturn-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 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.

The device features a ST-BY functionwhich 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.

A resistor (R
current that flows into C
required to bias the amplifier.

a) The pin will have a capacitor(C
automatic Mute duringturn 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 thispin; 1% precision resistors have to be used for R
to reach the fixed limits 0.63

) has to be connect between pin 10 and GND in orderto program the

S

capacitor (pin 11). Thevalues of CMand RSdetermine the time

M

) tied to GND to set the MUTE/STAND-BY time. An

M

≤ R

EXT/RS

≤0.69

EXT/RS

in to order

Figure 3: ApplicationCircuit with ExternalMute Control

0.22µF
39

2

1

TDA7396

8

11

CM

10 6

RS

TO µCorV

TO µC

IN+

0.22µF

IN-

STANDBY

S

REXT

7

5

4

GND

100nF

OUT+

OUT-

CD-DIA

1000µF

Vref

10KΩ

D93AU007

+V

S

TO µC

4/11

Figure 4: Quiescent Current vsSupply Voltage Figure5: EIAJ power vs SupplyVoltage

RL=2

=4

R

L

TDA7396

Ω

Ω

Figure 6: OutputPowervs SupplyVoltage(R

=2

R

Ω

L

L

=2Ω)

f = 1KHz

Figure 8: OutputPowervs SupplyVoltage(RL=4Ω)

R

=4Ω

L

f = 1KHz

Figure7:

Distortionvs Frequency(R

= 14.4V

V

S

R

=2

Ω

L

P

= 18W

O

f (Hz)

Figure9: Distortionvs Frequency(R

V

= 14.4V

S

R

=4

Ω

L

P

= 15W

O

=2Ω)

L

=4Ω)

L

f (Hz)

5/11

TDA7396

Figure 10: SupplyVoltageRejection vsFre-

quency

V

= 14.4V

S

V

= 1Vrms

r

R

=2

Ω

L

R

=0

g

f (Hz)

Figure 12: TotalPowerDiss i pation&Efficienc yvs.

=2Ω)

L

V

= 14.4V

S

R

=2

Ω

L

f = 1KHz

OutputPower(R

Figure11: CommonMode Rejection vs. Fre-

quency

= 14.4V

V

S

V

= 1Vrms

cm

R

=2

Ω

L

=0

R

g

f (Hz)

Figure13:

TotalPowerDissipati on& Efficiencyvs.

OutputPower (R

=4Ω)

L

= 14.4V

V

S

R

=4Ω

L

f = 1KHz

6/11

Figure 14: ApplicationCircuit

C2 0.22µF

IN+

C1 0.22µF

39

2

C5 100nF

OUT+

7

+V

S

C4 1000µF

TDA7396

IN-

1

TDA7396

J1

V

S

SW1

D93AU108

Figure 15: P.C.Board and Component Layout (1:1 scale)

ST-BY

C3

10µF

8

11

10 6

R2

51KΩ

5

4

GND

OUT-

CD-DIA

R1 15KΩ

100nF

5V

R3

100KΩ

TO µC

C6

7/11

TDA7396

CLIPPINGDETECTION & 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
positivevoltagereference (between 5V and Vs).

A) ClippingDetection

Current is sunk whenever the output clipping dis­tortion level reaches a fixed 0.5% threshold; this
function allows gain compressionfacility when the
amplifier is overdriven.

B) OutputFault Diagnostics

Current is sunk as soon as one of the following
output faultsis recognized:

- short-circuit to GND

- short-circuit to Vs

- short-circuit across the load(after turn-on)

- openload (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 theirdifferenttime duration.

THERMAL WARNING (seefig. 17)
Thermal protection has been implemented in ac-

cordance to a new principle involving different
steps:

1) Thermalfoldback(LinearThermal 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 decreasingalso the temperaturewithout out­put signal interruption (LTS). Supposing the ther­mal foldback does not reduce the junction tem­peratureto a safe level, a completeshutdown will
occurat 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.

Currentis sunkfrom the CD-DIA pin (#4)whenthe
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

DETECTOR/

DIAGNOSTICS

OUTPUT

(pin 4)

8/11

ClippingDetection & DiagnosticsWaveforms

Vo

CLIPPING

0

NORMAL OPERATION FAULT DIAGNOSTICS NORMAL OPERATION

S/C TO GND

D93AU005A

Figure 17: ThermalProtection& Diagnostic Waveforms

MAX

OUTPUT

VOLTAGE

SWING

0

140°C 160°C

DIAGNOSTICS

OUTPUT

(pin 4)

LINEAR

THERMAL

SHUT DOWN

ABS

THERMAL

SHUTDOWN

D93AU006A

TDA7396

9/11

TDA7396

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A5
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
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

mm inch

0.197

0.886

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.

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11/11