7-15
2.9.7 Over Voltage Protection
If some failure occurs and the output voltage of the secondary windings of T901 increase, the voltage of the
auxiliary winding of T901 also will increase proportionally. The protection circuit built into IC901 operates
when the voltage of 1pin of IC901 rises to about 28V,and Q911 is turn on.
Then the voltage of IC901 pin7 reaches over 8.8V and the oscillation is stopped.
C910
GND
R922
R9X4
R636
C9X2
IC901
C911
D911
T901
1
6
R911
D915
7
C920
Q911
R920
ZD920
VCC
MultFP
(Fig. 2.9.7) Over Voltage Protection
2.9.8 Over Current Protection
If some failure occurs and the total power of secondary outputs increase, the peak voltage of 4pin of IC901
increase proportionally. And when the peak voltage of 4pin reaches 0.62V, IC901 decrease on period duty
cycle of Q901 , and limits the transmission of the electric power. IC901 stops oscillating.
GND
OCP
T901
R909
IC901
R917
C913
Q901
FROM IC901 PIN2
DRIVE CIRCUIT
6
4
0.62V
C906
C906
(Fig. 2.9.8) Over Current Protection
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 ...
Page 439: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 1 14 10 1 ...
Page 440: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 2 14 10 2 ...
Page 441: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 3 14 10 3 ...
Page 442: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 4 14 10 4 ...
Page 443: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 5 14 10 5 ...
Page 444: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 6 14 10 6 ...
Page 445: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 7 14 10 7 ...
Page 446: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 8 14 10 8 ...
Page 447: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 9 14 10 9 ...
Page 448: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 10 14 10 10 ...
Page 449: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 11 14 10 11 ...
Page 450: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 12 14 10 12 ...
Page 451: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 13 14 10 13 ...
Page 452: ...SCHEMATIC DIAGRAM LCD2080UX MAIN PWB 14 14 10 14 ...
Page 453: ...SCHEMATIC DIAGRAM LCD2080UX POWER PWB 1 1 10 15 ...