ST TDA7391PD User Manual

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32W BRIDGECAR RADIO AMPLIFIER

HIGHPOWER CAPABILITY:
40W/3.2Ω EIAJ
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
ESD

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

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

ACROSS

S,

TDA7391PD

PRODUCT PREVIEW

PowerSO20

ORDERING NUMBER: TDA7391PD

DESCRIPTION

The TDA7391PD is a BRIDGE class AB audio
power amplifier specially intended for car radio
High Power applications.
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 AndApplicationCircuit

+V

S

C4 1000µF

Vref

R1

4.7KΩ
TO µC

D98AU871

R2

C5 100nF

2

19

17

GND

OUT+

OUT-

CD

C2 0.22µF

IN+

C1 0.22µF

IN-

V

S

SW1

October 1998

This is preliminaryinformationon anew product now in development. Details are subject tochange without notice.

ST-BY

C3

33µF

516

15

14

TDA7391PD

4

12

9

8 1,10,11,20

56KΩ

1/8

TDA7391PD

Figure 2: BlockDiagram

+

-

STANDBYTHRESHOLD

14

IN-

15

IN+

V

CC1VCC2

516

ICM

­gm

+

COMMON

MODE

REFERENCES

-

+

V

CC/2

POWERAMP

LTS V=f (Tj)

POWERAMP

THD

DETECT

SHORT

DUMP &

PROTECTION

V

S

CIRCUIT

THERMAL

L

DISABLE

TS

19

OUT-

17

CD

2

OUT+

+

-

MUTE THRESHOLD

MUTE SYNC S-GND STANDBY

PIN CONNECTION(Topview)

P-GND

OUT+

ST-BY

SYNC
MUTE S-GND

P-GND P-GND

PROGRAMMABLE

CURRENT CIRCUIT

894

N.C.

VCC

N.C.
N.C.

2
3
4
5
6
7
8
9
10

12

20
19
18
17
16
15
14
13

1,10,11,20

P-GND

P-GND1
OUT­N.C.
CD
VCC
IN+
IN­N.C.

D98AU872

12
11

D98AU873

THERMAL DATA

Symbol Description Value Unit

Thermal Resistance Junction-case Max 2 °C/W

2/8

R

th j-case

TDA7391PD

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) 32 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

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

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
RMS Output Power d = 10%

d=1%
d = 10%;R

EIAJ Output Power V

= 13.7V 40 W

S

= 3.2Ω

L

20 26

21
32

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 K

Single Ended 30 55 KΩ

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