SGS Thomson Microelectronics TDA7494 Datasheet

TDA7494

10W AMPLIFIER WITH DC VOLUME CONTROL

10W OUTPUT POWER RL = 8Ω, @ THD = 10% V

CC

= 28V ST-BY AND MUTE FUNCTIONS LINEAR VOLUME CONTROL DC COUPLED

WITH POWER OP AMPLIFIER NO BOUCHEROT CELL NO ST-BY RC INPUT NETWORK SIGNAL LINE OUTPUT BEFORE VOLUME

CONTROLLING AND MUTING 3 SWITCHABLE VOLTAGE CONTROLLED

INPUT PINS SINGLE SUPPLY RANGING UP TO 35V SHORT CIRCUIT PROTECTION THERMAL OVERLOAD PROTECTION INTERNALLY FIXED GAIN SOFT CLIPPING LOW TURN-ON TURN-OFF POP NOIS E MULTIWATT 15 PACKAGE

BLOCK AND APPLICATION DIAGRAM

MULTIPOWER BI50II TECHNOLOGY

Multiwatt15

ORDERING NUMBER:

DESCRIPTION

The TDA7494 10W is class AB power amplifier assembled in the @Multiwatt 15 package, specially designed for high quality sound, TV applications.

Features of the TDA7494 include volume control, 3 switchable inputs, Stand-by and mute functions.

TDA7494

3 x

470nF IN 1 IN 2 IN 3

PWR GND

SGN GND

February 1997

5 6 1

15

8

D95AU414D

100K

2

SW CTL

SW

1

3

243 7910

MONITOR

OUT

100K

300nF

VOL PWR

2K

VOL CTL

300nF

SVR

MUTE/STBY

PROTECTIONS

STAND-BY

470µF

10K 1µF

13 +V

14

MUTE

CC

470µF

OUT

1/12

TDA7494

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

S

V

IN

P

tot

T

amb

, T

T

stg

, V

V

2

(1) Operation between -20 to 85 °C guaranteed by correlation with 0 to 70°C.

PIN CONNECTION

DC Supply Voltage 35 V Maximum Input Voltage 8 Vpp Total Power Dissipation (Tamb = 70°C) 16 W Ambient Operating Temperature Range (1) -20 to +85 °C Storage and Junction Temperature -40 to 150 °C

j

Volume CTRL DC voltage 7 V

3

D95AU415A

PWR GND OUT +V

CC

N.C. N.C. MUTE STAND-BY SGN GND SVR IN 2 IN 1 MONITOR OUT VOLUME CONTROL SW CTL IN 3

15 14 13 12 11 10

9 8 7 6 5 4 3 2 1

THERMAL DATA

Symbol Parameter Value Unit

R

th j-case

R

th j-amb

ELECTRICAL CHARACTERISTICS

= 25°C; unless otherwise specified.)

T

amb

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

S

I

q

DCV

OS

V

O

P

O

Thermal Resistance Junction-case Typ = 3.8 Max = 4.8 °C/W Thermal Resistance Junction-ambient max 35 °C/W

(Refer to the test circuit, V

= 21V, RL = 8Ω; Rg = 50Ω;

S

Supply Voltage Range 11 35 V Total Quiescent Current 22 50 mA Output DC Offset Referred to

No Input Signal -400 400 mV

SVR Potential Quiescent Output Voltage VS = 28V 14 V Output Power THD = 10%; VCC = 28V, RL = 8Ω

THD = 1%; V

CC

= 28V

THD = 10%; VCC = 21V, THD = 1%; V

THD = 10%; V THD = 1%; V

= 21V,

CC

= 21V, RL = 4Ω

CC

= 21V,

CC

THD = 10%; VCC = 18V, THD = 1%; V

THD = 10%; V THD = 1%; V

= 18V

CC

= 18V, RL = 8Ω

CC

= 18V

CC

8 6

5

3.5 5

3.9

4.5

3.5

2.5

10

8

5.5 4

7.5

5.5 6

4.5

3.75

2.85

W

W W

W

2/12

TDA7494

ELECTRICAL CHARACTERISTICS

(continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

THD Total Harmonic Distortion P

I

G

A

MinVol

peak

T

V G

vLine

op

in

V

Output Peak Current (internally limited) 1.4 1.9 A Operating Temperature 0 70 °C Input Signal 2.8 Vrms Closed Loop Gain Vol Ctrl > 4.5V 24.5 26 27.5 dB Monitor Out Gain R Attenuation at Min Volume Vol Ctrl < 0.5V 80 dB

= 1W; f = 1KHz; Gv = 26dB 0.4 %

O

LOAD Mon

= ∞ -3 -1.5 0 dB

BW 0.6 MHz

e

N

Total Output Noise f = 20Hz to 22KHz

350 700 µV

Play, max volume f = 20Hz to 22KHz

60 100 µV

Play, max attenuation f = 20Hz to 22KHz

30 50 µV

Mute

SR Slew Rate 5 8 V/µs

R

i

R

Mon

R

load Mon

SVR Supply Voltage Rejection f = 1kHz; max volume

T

M

T

s

V

ST-BY

V

MUTE

Input Resistance 22.5 30 KΩ Monitor Output Resistance 1.4 2 3 KΩ Monitor Output Load 30 KΩ

36 43 dB

C

= 470µA; V

SVR

f = 1kHz; max attenuation C

= 470µA; V

SVR

RIP

= 1V

RMS

60 73 dB

RMS

Thermal Muting 150 °C Thermal Shut-down 160 °C Stand-by threshold 2.3 2.5 2.7 V

Mute Threshold 2.3 2.5 2.7 V Sel #1 Control Voltage Input #1 selected 0 1 V Sel #2 Control Voltage Input #2 selected 2.3 2.7 V Sel #3 Control Voltage Input #3 selected 4 5 V I

qST-BY

A

MUTE

I

stbyBIAS

Quiescent Current @ Stand-by 0.6 1 mA

Mute Attenuation 60 75 dB

Stand-by bias current Stand by on; V

V

= 5V;

MUTE

ST-BY

= 5V;

80 150 µA

Play or Mute 2 20 µA

I

muteBIAS

Mute bias current Mute 1.5 10 µA

Play 0.5 5 µA

I

switchBIAS

Switch bias current Input #1 selected -0.5 5 µA

Input #2 selected 1 10 µA Input #3 selected 1.5 20 µA

3/12

TDA7494

Figure 1:

+5V

R1

3.3K

R2

3.3K

Figure 2:

Test and Application Circuit.

MONITOR

OUT

213

IN 1

IN 2

IN 3

C3 470nF

C4 470nF

C5 470nF

S1

4

JMP1

TP1

4

5 6 1

R3 100K

300nF

C6

SGN GND

P.C.B. and component layout.

13 +V

SW

1

2

3

82

+5V VOL

P1

50K

LOG

R4

100K

5K

VOL PWR

TP2

C10 470µF

14

MUTE/STBY

PROTECTIONS

37910

SVR

C7

300nF

C8

470µF

STAND-

BY

R5

10K

S3S2

15

MUTE

GND

C9

1µF

+5V +5V

D96AU492B

C2

0.1µF

OUT PGND

C1

1000µF

GND

CC

4/12