
6-5
6-6
BLOCK DIAGRAM
SWITCHED MODE POWER SUPPLY /
WorldWide version
Blockdiagram SMPS CDR785WW, 040300
CN101
MAINS SOCKET
F101
T2A
Lightning
Protection
L101, L102
EMI-filter
T102
6,8V
22V
+5V EVER
overvoltage
protection
Q151
PC151
PC102
switch on/off
regulation
regulation
IC251
D251
D252
Q152
R152
C105
C251
D201
D206
C206
CON1
CON2
1
11
7
1
ON/OFF
+5V EVER
-F1
+F1
-38V
+5V
+5V
+5V
+12V
+12V
-8V
-8V
Q251
Q202
22V
22V
T101
15V
+12V
overvoltage
protection
D203
C204
-8V
C202
D202
C201
+5V
+5V
IC201
Q101
switching
transistor
reference
PC101
R209
D204
D205
C205
-30V
+F
-F
switching
transistor
sense
reference
S
3
4
6
2
Isense
out
on/off
Vcc
GND
feedback
5
8
7
1
R
Q
Vcc
BUFFER
OVERVOLTAGE
PROTECTION
OSCILLA
TO
R
BIAS
PWM
+
-
-
IC101
PWM CONTROLLER