SGS Thomson Microelectronics TDA7294V, TDA7294 Datasheet

TDA7294

100V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

VERY HIGH OPERATING VOLTAGE RANGE
(±40V)

DMOSPOWERSTAGE
HIGH OUTPUT POWER (UP TO 100W MU-

SIC POWER)
MUTING/STAND-BYFUNCTIONS
NOSWITCH ON/OFF NOISE
NOBOUCHEROTCELLS
VERYLOW DISTORTION
VERYLOW NOISE
SHORTCIRCUIT PROTECTION
THERMALSHUTDOWN

DESCRIPTION

The TDA7294 is a monolithic integrated circuit in
Multiwatt15 package, intended for use as audio
class AB amplifier in Hi-Fi field applications
(Home Stereo, self powered loudspeakers, Top­class TV). Thanks to the wide voltage range and

Figure1: TypicalApplication and TestCircuit

MULTIPOWERBCD TECHNOLOGY

Multiwatt15

ORDERING NUMBER: TDA7294V

to the high out current capability it is able to sup­ply the highest power into both 4Ω and 8Ω loads
even in presence of poor supply regulation, with
high SupplyVoltage Rejection.

The built in muting function with turn on delay
simplifies the remoteoperation avoiding switching
on-off noises.

+VsC7 100nF C6 1000µF

VM

VSTBY

February 1996

R3 22K

C2

R2

22µF

680Ω

C1 470nF

R1 22K

R5 10K

R4 22K

C3 10µFC410µF

IN- 2

IN+

IN+MUTE

MUTE

STBY

3

4

10
9

TDA7294

MUTE

STBY

1
STBY-GND

+PWVs+Vs

713

-

+

THERMAL

SHUTDOWN

-Vs -PWVs

C9 100nF C8 1000µF

-Vs

S/C

PROTECTION

158

14

6

OUT

C5

22µF

BOOTSTRAP

D93AU011

1/16

TDA7294

PIN CONNECTION (Topview)

TAB connected to -V

BLOCKDIAGRAM

S

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

I

O

P

tot

T

op

T

stg,Tj

2/16

Supply Voltage (No Signal) ±50 V

S

Output Peak Current 10 A
Power Dissipation T

=70°C50W

case

Operating Ambient Temperature Range 0 to 70 °C
Storage and Junction Temperature 150 °C

TDA7294

THERMALDATA

Symbol Description Value Unit

R

th j-case

ELECTRICALCHARACTERISTICS (Refer to the TestCircuit VS= ±35V, RL=8Ω,GV= 30dB;

=50Ω;T

R

g

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

S

I

q

I

b

V

OS

I

OS

P

O

d Total Harmonic Distortion (**) P

SR Slew Rate 7 10 V/µs

G

V

G

V

e

N

f

L,fH

R

i

SVR Supply Voltage Rejection f = 100Hz; V

T

S

STAND-BY FUNCTION (Ref: -V

V

ST on

V

ST off

ATT

st-by

I

q st-by

MUTE FUNCTION (Ref: -V

V

Mon

V

Moff

ATT

mute

Note (*):

MUSIC POWER CONCEPT
MUSIC POWER is the maximal power which the amplifier is capable ofproducingacross the ratedload resistance (regardless of non linearity)
1 sec afterthe application of a sinusoidal input signalof frequency 1KHz.

Note (**): Tested with optimized Application Board (see fig. 2)
Note (***): Limited by themax. allowable current.

Thermal Resistance Junction-case Max 1.5 °C/W

=25°C,f = 1 kHz; unlessotherwisespecified.

amb

Supply Range ±10 ±40 V
Quiescent Current 20 30 60 mA
Input Bias Current 500 nA
Input OffsetVoltage +10 mV
Input OffsetCurrent +100 nA
RMS Continuous OutputPower d = 0.5%:

V

Music Power (RMS)
IEC268.3 RULES - ∆t = 1s (*)

= ± 35V, RL=8Ω

S

V

=±31V, RL=6Ω

S

V

=±27V, RL=4Ω

S

d = 10%
R

=8Ω ;VS=±38V

L

R

=6Ω ;VS=±33V

L

R

=4Ω ;VS=±29V (***)

L

= 5W; f = 1kHz

O

P

=0.1to50W;f=20Hzto20kHz

O

= ±27V, RL=4Ω:

V

S

P

= 5W; f = 1kHz

O

P

=0.1to50W;f=20Hzto20kHz

O

60
60
60

70
70
70

100
100
100

0.005

0.01

0.1

0.1

W
W
W

W
W
W

%
%

%
%

Open Loop Voltage Gain 80 dB
Closed Loop Voltage Gain 24 30 40 dB
Total Input Noise A = curve

f = 20Hz to 20kHz

1
25

µV
µV

Frequency Response (-3dB) PO= 1W 20Hz to 20kHz
Input Resistance 100 kΩ

= 0.5Vrms 60 75 dB

ripple

Thermal Shutdown 145 °C

or GND)

S

Stand-by on Threshold 1.5 V
Stand-by off Threshold 3.5 V
Stand-by Attenuation 70 90 dB
Quiescent Current @ Stand-by 1 3 mA

or GND)

S

Mute on Threshold 1.5 V
Mute off Threshold 3.5 V
Mute AttenuatIon 60 80 dB

3/16

TDA7294

Figure2: P.C.B.and components layoutof the circuit of figure 1. (1:1 scale)

Note:

The Stand-by and Mute functions can be referred either to GND or -VS.
On the P.C.B. is possibleto set both the configuration through the jumper J1.

4/16

TDA7294

APPLICATION SUGGESTIONS(see Test and ApplicationCircuits of the Fig. 1)

The recommendedvalues of the external components are those shown on the applicationcircuit of Fig­ure 1. Differentvaluescan be used;the followingtable can helpthe designer.

COMPONENTS SUGGESTED VALUE PURPOSE

R1 (*) 22k INPUT RESISTANCE INCREASE INPUT

R2 680Ω CLOSED LOOP GAIN

SET TO 30dB (**)

R3 (*) 22k INCREASE OF GAIN DECREASE OFGAIN

R4 22k ST-BY TIME

CONSTANT

R5 10k MUTE TIME

CONSTANT

C1 0.47µF INPUT DC

DECOUPLING

C2 22µF FEEDBACK DC

DECOUPLING

C3 10µF MUTE TIME

CONSTANT

C4 10µF ST-BY TIME

CONSTANT

LARGER THAN

SUGGESTED

IMPRDANCE

DECREASE OF GAIN INCREASE OF GAIN

LARGER ST-BY

ON/OFF TIME

LARGER MUTE

ON/OFF TIME

LARGER MUTE

ON/OFF TIME

LARGER ST-BY

ON/OFF TIME

SMALLER THAN

SUGGESTED

DECREASE INPUT

IMPEDANCE

SMALLER ST-BY

ON/OFF TIME;

POP NOISE

SMALLER MUTE

ON/OFF TIME
HIGHER LOW

FREQUENCY

CUTOFF

HIGHER LOW

FREQUENCY

CUTOFF

SMALLER MUTE

ON/OFF TIME

SMALLER ST-BY

ON/OFF TIME;

POP NOISE

C5 22µF BOOTSTRAPPING SIGNAL

C6, C8 1000µF SUPPLY VOLTAGE

C7, C9 0.1µF SUPPLY VOLTAGE

(*) R1 = R3 FOR POP OPTIMIZATION
(**) CLOSED LOOP GAINHAS TO BE ≥ 24dB

BYPASS

BYPASS

DEGRADATION AT
LOW FREQUENCY

DANGER OF

OSCILLATION

DANGER OF

OSCILLATION

5/16