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Figure:
Figure:
Degaussing
When the set is switched on, the degaussingrelay 1515 is immediately activated as transistor
7580 is conducting.Due to the RC-time of R3580 and C2580, it will last about 3 to 4
secondsbefore transistor 7580 is switched off.
Basic IC Functionality
For a clear understanding of the Quasi-Resonantbehavior, it is possible to explain it by a
simplified circuit diagram(see Figure below). In this circuit diagram, the secondary sideis
transferred to the primary side and the transformer is replacedby an inductance L
P
.C
D
is the
totaldrain capacitance including the resonance capacitor C
R
, parasitic output capacitorC
OSS
of the MOSFETand the winding capacitance C
W
ofthe transformer. The turns ratio of the
transformer is representedby n (N
P
/N
S
).
Pa
g
e 15 of 32SPMS
7/8/2004