7-12
2.9.3 Auxiliary Power Supply Circuit
The auxiliary power supply circuit is needed to activate IC901.
When SW.REG PWB receives “PMS” signal, Q933 and Q908 is turned off with the above-mentioned
ON/OFF circuits. The charging current flows into the capacitor C911 through IC901 pin12, IC901 pin1.
Oscillation starts when the voltage of IC901 pin1 reaches 17.5V by this charging operation.
After the start of oscillation, the fly-back voltage of auxiliary winding of T901 is rectified and smoothed by
D911 and C910.
The resulting DC voltage is supplied to IC901 1pin.
C906
C906
D911
D915
R911
IC901
C911
1
6
T901
R908
Q908
Q933
12
ZD908
R904 R905 R906
Startup
VCC
Startup
Circuit
GND
C910
(Fig.2.9.3) Auxiliary Power Supply Circuit
Summary of Contents for LCD2080UX - MultiSync - 20.1" LCD Monitor
Page 4: ...1 1 User s Manual 1 A Version MultiSync LCD2080UX TM ...
Page 30: ...1 27 2 B Version MultiSync LCD2080UX User s Manual ...
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