庐
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
卤10
TO
卤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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