SGS Thomson Microelectronics TDA7391 Datasheet



35W BRIDGECAR RADIO AMPLIFIER

HIGHPOWER CAPABILITY:
40W/4Ω MAX
35W/4Ω EIAJ
45W/3.2Ω MAX
40W/3.2ΩEIAJ
32W/3.2Ω@V
26W/4Ω @V

DIFFERENTIAL INPUTS (EITHER SINGLE
ENDED OR DIFFERENTIAL INPUT SIGNAL
ARE ACCEPTED)

MINIMUMEXTERNALCOMPONENTCOUNT:

- NOBOOTSTRAPCAPACITORS

- NOBOUCHEROT CELLS

- INTERNALLYFIXEDGAIN(30dB)

- NOSVRCAPACITOR
ST.-BYFUNCTION (CMOS COMPATIBLE)
PROGRAMMABLETURN-ON/OFF DELAY
NO AUDIBLE POP DURING MUTE AND ST-

BY OPERATIONS

PROTECTIONS:

SHORT CIRCUIT (TO GND, TO V
THE LOAD)

VERYINDUCTIVE LOADS
CHIP OVERTEMPERATURE
LOADDUMP
OPENGND

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

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

ACROSS

S,

TDA7391

Multiwatt11

ORDERING NUMBER: TDA7391

ESD

DESCRIPTION

The TDA7391 is a BRIDGEclass AB audio power
amplifier specially intended for car radio High
Powerapplications.
The high power capabilitytogether withthe possi­bility to operate either in DIFFERENTIAL INPUT
MODE or SINGLEENDED INPUT MODE makes
it suitable for boosters and high end car radio
equipments.
The exclusive fully complementary output stage
and the internal fixed gain configuration drop the
externalcomponentcount.
The on board clipping detectorallowseasy imple­mentationof gain compressionsystems.

Figure 1: Test AndApplication Circuit

+V

S

C4 1000µF

Vref

R1

4.7KΩ
TO µC

D94AU133

R2

56KΩ

C5 100nF

OUT+

7

OUT-

5

CD

4

GND

C2 0.22µF

39

C3

33µF

2

1

8

11

TDA7391

10 6

IN+

C1 0.22µF

IN-

V

S

SW1

October 1998

This is advanced informationon a new product now in development or undergoing evaluation. Details are subject to changewithout notice.

ST-BY

1/8

TDA7391

Figure 2: BlockDiagram

+

-

STANDBYTHRESHOLD

1

IN-

2

IN+

V

CC1VCC2

39

ICM

­gm

+

COMMON

MODE

REFERENCES

-

+

V

CC/2

POWER AMP

LTS V=f (Tj)

POWER AMP

THD

DETECT

SHORT

DUMP &

PROTECTION

V

S

CIRCUIT

THERMAL

L

DISABLE

TS

5

OUT-

4

CD

7

OUT+

+

-

MUTE THRESHOLD

MUTE SYNC GND STANDBY

PIN CONNECTION(Topview)

TAB CONNECTED TO PIN 6

PROGRAMMABLE

CURRENT CIRCUIT

1011 8

6

D94AU134

11
10

9
8
7
6
5
4
3
2
1

D94AU135

MUTE
SYNC
+V

S

STAND-BY
OUT+
GND
OUT­CD
+V

S

IN+
IN-

THERMAL DATA

Symbol Description Value Unit

Thermal Resistance Junction-case Max 1.8

2/8

R

th j-case

C/W

°

TDA7391

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

4.5
6

Storage and Junction-Case Temperature -40 to 150

A
A

C

°

ELECTRICAL CHARACTERISTICS (VS= 14.4V; RL=4Ω, 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

I

Min

A

M

P

O

P

O EIAJ

P

O MAX

d Distortion

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 5 10 15 %

T

sd

(*) Saturated sqare wave output.

Supply Voltage Range 8 18 V
Total Quiescent Current 60 150 mA
Output Offset Voltage 120 mV
ST-BY Current V
ST-BY Input Bias Current V

= 1.5V 100

ST-BY

=5V 10

ST-BY

ST-BY On ThresholdVoltage 1.5 V
ST-BY Off thresholdVoltage 3.5 V
ST-BY Attenuation 90 dB
Mute Input BiasCurrent (V

= 5V) 10

MUTE

Mute Attenuation 90 dB
Output Power d = 10%

d=1%
d = 10%;R

= 3.2Ω

L

EIAJ Output Power (*) VS = 13.7V;RL= 3.2
MAX Output Power (*) VS= 14.4V; RL= 3.2

Ω
Ω

20 26

21
32

40 W
45 W

0.06

P

= 0.1 to 15W

O

0.03

Voltage Gain 29.5 30 30.5 dB
High Frequency rolloff PO= 1W; -3dB 75 KHz
Input Impedance Differential 36 60 KΩ

Single Ended 30 55 K

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

= 1Vrms 65 dB

IN

=0Ω;Vr= 1Vrms 60 dB

g

Absolute Thermal Shutdown

160

Junction Temperature

A

µ

A

µ

A

µ

W
W
W

%
%

Ω

C

°

3/8

TDA7391

FUNCTIONAL DESCRIPTION

Pin Function Description

1, 2 INPUTS

3,9 +V

S

4CD

5, 7 OUTPUTS

6 GND Ground.

8 STAND-BY

10 SYNC

11 MUTE

The input stage is a high impedance type also capable ofoperation in single ended mode
with one input capacitively coupled to the signal GND. The impedanceseen by the
inverting and non inverting input pins must be matched.

Supply Voltage.
The TDA7391 is equippedwith a diagnostic circuitry ableto detect the clipping in the

Output Signal (distortion= 10%).
The CD pin(open collector)gives out low level signal during clipping.

The output stage isa bridge type able to drive loads as low as 3.2Ω.
It consists of two class AB fully complementary PNP/NPN stages fully protected.
A rail to rail outputvoltage swingis achievedwithout need ofbootstrap capacitors.
No external compensation is necessary.

The device features aST-BY functionwhich shuts downall the internal bias supplies
when the ST-BY pinis low.
In ST-BY mode the amplifier sinks a small current(in therange of few µA).
When the ST-BY pin ishigh theIC becomes fully operational.

A resistor (R
that flows in the C

) has to beconnect between pin 10 and GND in order to program thecurrent

2

capacitor (pin 11). The values of C3and R2determine the time

3

required to bias the amplifier.
The pin will havea capacitor (C

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

3

automatic Mute during turn on/off is provided to preventnoisy transients.

Figure 3: P.C. Boardand ComponentLayout of theFig. 1 (1:1 scale).

4/8

Figure 4: Quiescent Current vsSupply Voltage Figure5: EIAJpower vsSupplyVoltage

TDA7391

Figure 6: OutputPowervs SupplyVoltage

=4Ω)

(@R

L

R

=4

Ω

L

f = 1KHz

RL= 3.2

Ω

R

=4

L

Figure7: Distortionvs Frequency(@ R

V
R
P

Ω

=4Ω)

L

= 14.4V

S

=4

L

= 12W

O

Ω

Figure 8: OutputPowervs SupplyVoltage

=3.2Ω)

(@R

L

R

= 3.2Ω

L

f = 1KHz

f = (Hz)

Figure9: Distortionvs Frequency(R

f = (Hz)

=4Ω)

L

V
R
P

= 14.4V

S

= 3.2

L

= 15W

O

Ω

5/8

TDA7391

Figure 10: SupplyVoltageRejection vsFre-

quency

= 14.4V

V

S

V

= 1Vrms

r

R

=4

Ω

L

R

=0

g

f = (Hz)

Figure 12: TotalPowerDissipation&Efficienc yvs.

OutputPower(@R

=4Ω)

L

Figure11: CommonMode Rejectionvs. Fre-

quency

V

= 14.4V

S

V

= 1Vrms

cm

R

=4

Ω

L

R

=0

g

f = (Hz)

Figure13: PowerBandwidth

V

= 14.4V

= 14.4V

V

S

R

=4Ω

L

f =1KHz

P

(W)

O

R
P

S

L

O

=4Ω

=1W

f = (Hz)

6/8

TDA7391

DIM.

Dia1 3.65 3.85 0.144 0.152

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

mm inch

0.197

0.886

OUTLINE AND

MECHANICAL DATA

Multiwatt11 V

7/8

TDA7391

Information furnished is believed tobe 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. Specificationmentioned in this publication are
subject to change without notice. This publicationsupersedes 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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 1998STMicroelectronics – Printedin Italy– All Rights Reserved

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