TDA7490L Datasheet TDA7490L | P1-P3

1/11

TDA7490L

December 2005

1FEATURES

■ 20W + 20W OUTPUT POWER:

@R

L

= 8Ω/4Ω; THD = 10%

■ HIGH EFFICIENCY

■ WIDE SUPPLY VOLTAGE RANGE (FROM ±10

TO ±25V)

■ SPLIT SUPPLY, SINGLE SUPPLY

OPERATION

■ TURN OFF/ON POP FREE

■ ST-BY AND MUTE FEATURES

■ SHORT CIRCUIT PROTECTION ACROSS

THE LOAD

■ THERMAL OVERLOAD PROTECTION

■ EXTERNALLY SINCHRONIZABLE

■ BRIDGE CONFIGURATION

2DESCRIPTION

The TDA7490L is a dual audio class D amplifier

assembled in Flexiwatt 25 package; it is specially

designed for high efficiency application mainly for

TV and Home Stereo sets.

20W + 20W STEREO CLASS-D AMPLIFIER

40W MONO IN BTL

Figure 2. Test and Application Circuit. (Stereo Configuration)

PWM-stage1G=2.5

PREAMPLIFIER1

INTEGRATOR1

R21 4.7K

C26 470pF C25 470pF

R20

68K

R17 52.3K

C23

2200µF

C22

100nF

C21

2200µF

R4

130K

L1 30µ

INPUT1

OSC

C19

560pF

C20

33nF

C18 330pF

C17

24pF

C16 330pF

R15

100

-V

CC

R14 22K

R12 22K

C10

220nF

OUT1

PWM-stage2

L2 30µ

OUT2

C29

220nF

R13

10K

C15

560pF

R11

100

-V

CC

EXT_CK

G=2.5

PREAMPLIFIER2

C8 470pF

C9 470pF

R6

68K

R5 4.7K

C14

33nF

R9 52.3K

+V

CC

-V

CC

+V

CC

+V

CC

-V

CC

C28

2200µF

C12

2200µF

C11

100nF

C1 330nF

C2

1nF

STBYMUTE R2

30K

C27

2.2µF

R1 10K

C3

100nF

C4

100nF

INPUT2

C5 330nF

C6

1nF

-V

CC

-V

CC

D98AU978A

79

14 2 46

10

12

13

16

1

25

18

19 17

20 24 22

21

23

15

8

11

3

5

INTEGRATOR2

R3

10K

C7 100nF

R1 10K

R 6.8

Rev. 2

Fi

gure 1.

P

ac

k

age

Table 1. Order Codes

Part Number Package

TDA7490L Flexiwatt 25

Flexiwatt 25

Obsolete Product(s) - Obsolete Product(s)

TDA7490L

2/11

Figure 3. Test and Application Circuit. (Bridge Configuration)

Table 2. Absolute Maximum Ratings

Table 3. Thermal Data

Symbol Parameter Value Unit

V

CC

DC Supply Voltage (no signal) ±30 V

P

tot

Power Dissipation T

case

= 70°C 35 W

T

stg

, T

j

Storage and Junction Temperature –40 to 150 °C

T

op

Operating Temperature Range 0 to 70 °C

V

6,8,10,18

Maximum Voltage on pins # 6,8,10,18 referred to GND ±5V

Symbol Parameter Value Unit

R

th j-case

Thermal Resistance Junction-case Typ. 1 °C/W

PWM-stage

PRE

+

-

+

470pF

R4

68K

R5 52.3K

L9 30µ

INPUT

C23

235nF

PWM-stage

L10 30µ

C26

470nF

dumping

(common

mode)

The LC filter is optimized for 8Ω

(<->LC filter for 4Ω in single-ended)

It hos to be changed for other loads

C24

235nF

C29

470nF

R28

10

R27

10

R25

Rload

PRE

470pF 470pF

R61

68K

R62 52.3K

D99AU1081

7

9

10

18

19 17

23

3

R63

4.7K

Int.

C40

C60 C59

C41

Obsolete Product(s) - Obsolete Product(s)

3/11

TDA7490L

Figure 4. Application in Supply Voltage

*

New component

EXT_CK

+VS

IN 1

IN 2

+Vs

C20

33nF

1

2

C18

330pF

1 2

C14

33nF

1

2

C19

560pF

12

C16

330pF

1 2

C17

24pF

12

C29

220nF

12

C26

470pF

1 2

C25

470pF

1 2

C7

100nF

1 2

C15

560pF

12

L1

30uF

1 2

R15

100

12

R14

22K

1 2

R12

22K

1 2

OUT 2

1

2

1 2

L2

30uH

1 2

R11

100

12

R4

130K

12

R20

68K

12

R17

52.3K

1 2

R21

4.7K

1 2

R2

30k

12

R1

10K

1 2

R3

10k

12

Stby

1 2

Mute

1 2

C1

330nF

1 2

C2

1nF

1 2

C3

100nF

1 2

C5

330nF

1 2

C4

100nF

1

2

C6

1nF

1

2

C9

470pF

12

C8

470pF

12

R6

68K

1 2

R9

52.3K

12

R5

4.7K

12

C27

1 uF

12

R13

10K

12

C10

220nF

12

OUT 1

1

2

C21

2200uF

12

C12

2200uF

12

R22

1K

12

R23

1K

12

C22

100nF

1

2

U1

TDA7490L

MUTE

6

IN 1

10

-VS

1

IN 2

18

10V REG

25

OUT1

3

BOOT1

5

-5V REG

16

+5V REG

12

SGND

13

BOOT2

21

FEED1

7

FEED2

9

T1

11

T2

15

OSC

8

+VSP2

22

FEED4

19

-VSP2

24

FEED3

17

OUT2

23

N.C.

20

CURREF

14

+VSP1

4

-VSP1

2

C11

100uF

1 2

TDA7490L

TDA7490L

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