Philips DPTV465, Руководство по обслуживанию

Страница: 114 / 127

Circuit Descriptions, List of Abbreviations, and IC Data Sheets EN 114 DPTV465 9.
Figure 9-57 Internal Block Diagram and Pin Configuration
9.7.9
Diagram S7, TDA7490 (IC7700)
Figure 9-58 Internal Block Diagram and Pin Configuration
PWM-stage
PRE +
-
-
+
470pF 470pF
R4
68K
R5 52.3K
L9 30
µ
INPUT
C23
235nF
PWM-stage
L10 30
µ
C26
470nF
dumping
(common
mode)
The LC filter is optimized for 8
Ω
(<->LC filter for 4
Ω
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
7 9
10
18
19 17
23
3
R63
4.7K
Int.
Int.
C40
C60 C59
C41
V-
C
C
V-
C
C
1
T
U
O
V
+
C
C
1
T
O
O
B
E
T
U
M-
Y
B
T
S
1
D
E
E
F
C
S
O
2
D
E
E
F
1
NI
1
T
V
5
+
D
N
G
F
E
R
R
U
C
2
T
V
5-
3
D
E
E
F
2
NI
4
D
E
E
F
.
C.
N
2
T
O
O
B
V
+
C
C
2
T
U
O
V-
C
C
g
er
V
1 25
INTERNAL BLOCK DIAGRAM
PIN CONFIGURATION
E_15000_124.eps
181004