SGS Thomson Microelectronics TDA7494S Datasheet

®

TDA7494S

10W AMPLIFIER

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

CC

= 28V
ST-BY AND MUTE FUNCTIONS
NO BOUCHEROT CELL
NO ST-BY RC INPUT NETWORK
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

DESCRIPTION

The TDA7494S 10W is class AB power amplifier
assembled in the @Multiwatt 15 package, spe-

BLOCK AND APPLICATION DIAGRAM

MULTIPOWER BI50II TECHNOLOGY

Multiwatt15

ORDERING NUMBER:

cially designed for high quality sound, TV applica­tions.
Features of the TDA7494S include Stand-by and
mute functions.

TDA7494S

December 1999

IN 1

PWR GND

SGN GND

470nF

1

30K

15

8

D99AU1012

PWR

MUTE/STBY

PROTECTIONS

79 10

SVR

STAND-BY

470µF

13 +V

14

10K 1µF

MUTE

CC

470µF

OUT

1/12

TDA7494S

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

S

V

IN

P

tot

T

amb

, T

T

stg

(1) Operation between -20 to 85 °C guaranteed by correlation with 0 to 70°C.
(2) Pin 3 is ESD sensitive (max. voltage ±1.5KV)

PIN CONNECTION

DC Supply Voltage 40 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

D99AU1014

PWR GND
OUT
+V

CC

N.C.
N.C.
MUTE
STAND-BY
SGN GND
SVR
N.C.
N.C.
N.C.
N.C.
N.C.
IN 1

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 -550 550 mV

SVR Potential
Quiescent Output Voltage VS = 18V 7.8 9 10.2 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

3.5

2.2

10

8

5.5
4

6.6

5.5
6

4.5

3.75

2.85

W

W

W

W
W

W

2/12

TDA7494S

ELECTRICAL CHARACTERISTICS

(continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

THD Total Harmonic Distortion P

I

T

peak

op

V
G

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

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

O

BW 0.6 MHz

e

N

Total Output Noise f = 20Hz to 22KHz

30 50 µV

Play
f = 20Hz to 22KHz

30 50 µV

Mute

SR Slew Rate 5 8 V/µs

R

i

SVR Supply Voltage Rejection f = 1kHz;

T

M

T

s

V

ST-BY

V

MUTE

I

qST-BY

A

MUTE

I

stbyBIAS

Input Resistance 22.5 30 KΩ

36 43 dB

C

= 470µA; V

SVR

RIP

= 1V

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
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

3/12

TDA7494S

Figure 1:

Figure 2:

Test and Application Circuit.

C4 470nF

IN 1

1

87910

SGN GND

P.C.B. and component layout.

SVR

PWR

470µF

STAND-

MUTE/STBY

PROTECTIONS

C8

BY

13 +V

C2

C10

0.1µF

OUT
PGND

14

470µF

GND

15

MUTE

C9

1µF

+5V
+5V

D99AU1013

R5

10K

S3S2

C1

1000µF

GND

CC

4/12

TDA7494S

APPLICATION SUGGES TION S

The recommended values of t he external components are those shown on t he application circuit of fig­ure 1. Different values can be used; the following table can help the designer.

COMPONENT

R5 10KΩ Mute time constant Larger mute on/off time Smaller mute on/off time
C1 1000µF Supply voltage bypass Danger of oscillation
C2 100nF Supply voltage bypass Danger of oscillation

C5 470nF Input DC decoupling
C8 470µF Ripple Rejection Better SVR Worse SVR

C9 1µF Mute time constant Larger mute on/off time Smaller mute on/off time

C10 470µF Output DC decoupling

SUGGESTION

VALUE

TYPICAL CHARACTERISTICS:

PURPOSE

Lower low frequency
cutoff

Lower low frequency
cutoff

Refer to the Application Circuit of Fig.1 V

RS = 8Ω; Tamb = 25°C; RS = 50Ω; unless otherwise specified

Figure 3:

P

OUT

(W)

14
12
10

Output Power vs Supply Voltage

D96AU517

Figure 4:

d

(%)

1

LARGER THAN

SUGGESTION

Higher low frequency
cutoff

Higher low frequency
cutoff

= 21V; RL = 8Ω; f = 1KHz;

S

Distortion vs Output Power

VS=28V
R

=8Ω

L

SMALLER THAN

SUGGESTION

D96AU518

8
6
4
2
0

5 10 15 20 25 30 Vs(V)

d=10%

d=1%

f=15KHz

0.1

f=1KHz

0.01
02468P

OUT

(W)

5/12

TDA7494S

Figure 5:

P

OUT

(W)

7
6
5
4
3
2
1
0

11 13 15 17 19 VS(V)

Figure 7:

d

(%)

1

Output Power vs Supply Voltage

D96AU519

RL=4Ω

d=10%

d=1%

Distortion vs Frequency

D96AU521

P

=1W

OUT

R

=8Ω

L

Figure 6:

d

(%)

1

0.1

0.01
0246P

Figure 8:

d

(%)

1

Distortion vs Output Power

VS=21V

=4Ω

R

L

f=15KHz

f=1KHz

Distortion vs Frequency

P

=1W

OUT

=4Ω

R

L

D96AU520

OUT

D96AU522

(W)

0.1

0.01
20

Figure 9:

I

Q

(mA)

28

26

24

22

20

18

16

10 14 18 22 26 30 VS(V)

100

1K

f(Hz)

Quiescent Current vs Supply Voltage

D96AU523

0.1

0.01
20

Figure 10:

V

DDC

(V)

15

13

11

9

7

5

10 14 18 22 26 30 VS(V)

100

1K

f(Hz)

Quiescent Output Voltage vs Supply

Voltage

D96AU524

6/12

TDA7494S

Figure 11:

ATT
(dB)

0

-20

-40

-60

-80

-100

-120

-140
0 1 2 3 4 Vpin#9(V)

Figure 13:

P

DISS

(W)

8

6

Stand-by Attenuation vs Vpin # 9

D96AU527

0dB=1W

Power Dissipation vs Output Power

D96AU529

RL=8Ω

VS=35V

Figure 12:

ATT
(dB)

0

-20

-40

-60

-80

-100
01234Vpin#10(V)

Figure 14:

P

DISS
(W)

8

6

Mute Atttenuation vs Vpin # 10

D96AU528

0dB=1W

Power Dissipation vs Output Power

D96AU530

RL=4Ω

VS=21V

4

VS=28V

2

VS=21V

0

0.1 1 10 P

OUT

(W)

4

VS=18V

2

0

0.1 1 10 P

OUT

(W)

7/12

TDA7494S

MUTE STAND-BY TRUTH TABLE

MUTE ST-BY OPERATING CONDITION

H H STANDBY

L H STANDBY

H L MUTE

L L PLAY

Turn ON/OFF Sequences (for optimising the POP performances)

A) USING MUTE AND STAND-BY FUNCTION S

(V)

V

S

28

ST-BY

pin#9 (V)

5

V

SVR

pin#7(V)

2.5V

MUTE

pin#10 (V)

5

INPUT

(mV)

V

OUT
(V)

I

Q

(mA)

B) USING ONLY THE MUTE FUNCTI ON
To semplify the application, the stand-by pin can

be connected directly to Ground.
During the ON/OFF tr ansitions we recommend to

respect the following conditions:

OFFSTBY MUTE PLAY STBYOFF MUTE

D96AU531A

- At the turn-on the transition mute to play must
be made when the SVR pin is higher than

2.5V

- At the turn-off the TDA7494S must be brought
to mute from the play condition when the SVR
pin is higher than 2.5V.

8/12

PINS:

PIN:

IN1

SVR

INn

SVR

D97AU581

30K

V

TDA7494S

S

100µA

SVR

V

S

20K

20K

100µA

V

S

V

S

+

OUT L

-

6K

6K

1K

1K

30K

30K

-

OUT R

+

D97AU585A

9/12

TDA7494S

PIN:

ST-BY

PIN:

MUTE

PIN:

OUT

STBY

D97AU588

200

10µA

D97AU586

OUT

V

S

300MUTE

10K

V

S

50µA

D97AU587

PINS:

PW-GND , S-G ND

V

S

V

S

GND

D97AU593

10/12

TDA7494S

DIM.

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

A 5 0.197

B 2.65 0.104
C 1.6 0.063
D 1 0.039

E 0.49 0.55 0 .019 0.022

F 0.66 0.75 0.026 0.030
G 1.02 1.27 1.52 0.040 0.050 0.060

G1 17.53 17.78 18.03 0.690 0.700 0.710

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 0.870 0.886
L2 17.65 18.1 0 .695 0.713
L3 17.25 17.5 1 7.75 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 4.63 5.08 5.53 0.182 0.200 0.218

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

OUTLINE AND

MECHANICAL DATA

Multiwatt15 V

11/12

TDA7494S

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12/12