Denon AVR-550SD, Service Manual

Page: 6 / 71

6
AVR-550SD
SEMICONDUCTORS
Only major semiconductors are shown, general semiconductors etc. are omitted to list.
主な半導体を記載しています。汎用の半導体は記載を省略しています。
1. IC’s
Note: Abbreviation ahead of IC No. indicates the name of P.W.B., etc.
注 ): IC No. の前の記号は、基板の名称を表します。
MAIN: AUDIO DIGITAL P.W.B.
FRONT: FRONT P.W.B.
SMPS: SMPS P.W.B.
VIDEO: VIDEO P.W.B.
I/O: INPUT/OUT PUT P.W.B.
ICE1QS01 (SMPS:IC1)
Pin Assignmen
Block Diagram
1
2
3
4 5
6
7
8
N.C.
PCS
RZI
SRC
VCC
OUT
GND
OFC
RZI
UVLO
Q
Q
SET
CLR
S
R
Reference
Voltage and
Current
GND
OUT
Power
Driver
Ringing
Suppression
Time
1V
25mV
OFC
PCS
SRC
VCC
1V
2V
Burst-Mode
+
-
+
-
+
-
+
-
+
-
+
-
+
-
3.5V
4.4V
+
-
4.8V
+
-
20V
Overvoltage
Protection
Start
Digital Processing
50µs Timer
50ms Timer
ZC-Counter
UP/DO-Counter
Latch
Primary
Regulation
+
-
5V
Q
Q
SET
CLR
D
L
1V
+
-
Foldback
Point Corr.
1.5V
+
-
5.7V
5V
5V
20k