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廬

TDA7490

25W + 25W STEREO CLASS-D AMPLIFIER

50W MONO IN BTL

PRODUCT PREVIEW

25W + 25W OUTPUT POWER:

R

L

= 8鈩?4鈩? THD = 10%

HIGH EFFICIENCY

WIDE SUPPLY VOLTAGE RANGE (FROM

鹵10

TO

鹵25V)

SPLIT SUPPLY

TURN OFF/ON POP FREE

ST-BY AND MUTE FEATURES

SHORT CIRCUIT PROTECTION ACROSS

THE LOAD

THERMAL OVERLOAD PROTECTION

EXTERNALLY SINCHRONIZABLE

BRIDGE CONFIGURATION

Flexiwatt 25

ORDERING NUMBER:

TDA7490

DESCRIPTION

The TDA7490 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.

Figure 1.

Test and application circuit. (Stereo Configuration)

R1 10K

+V

CC

R17 52.3K

-V

CC

+V

CC

MUTE

STBY

R2

30K

C27

2.2碌F

6

R21 4.7K

C26 470pF C25 470pF

R20

68K

7

9

R3

10K

R4

130K

C23

2200碌F

14

2

C22

100nF

4

C21

2200碌F

-V

CC

R15

100

C1 330nF

INPUT1

C2

1nF

10

G=2.5

PWM-stage1

INTEGRATOR1

5

C20

33nF

C18 330pF

C19

560pF

L1 30碌

OUT1

C10

220nF

PREAMPLIFIER1

12

3

C3

100nF

C4

100nF

R1 10K

-V

CC

C7 100nF

-V

CC

R 6.8

C5 330nF

INPUT2

C6

1nF

11

R14 22K

OSC

8

C17

24pF

15

C16 330pF

R13

10K

EXT_CK

13

16

1

25

PREAMPLIFIER2

18

G=2.5

INTEGRATOR2

PWM-stage2

20

24

22

23

R12 22K

C14

33nF

L2 30碌

C15

560pF

R11

100

-V

CC

OUT2

C29

220nF

21

19

R5 4.7K

C8 470pF

R6

68K

17

C9 470pF

C28

2200碌F

-V

CC

R9 52.3K

C11

100nF

C12

2200碌F

+V

CC

D98AU978A

December 1999

This is preliminary information on a new product now in development. Details are subject to change without notice.

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