P Ower Supply (Str F6653); Str-F6654 Gener Aral Descr I Ption; Power Supply Primary Part Operations - Daewoo CHASSIS : SC-150 Model : DSC-3220E Service Manual

Service manual SC-150
5-9 Power supply (STR F6654)
5-9-1 STR-F6654 general description
The STR-F6654 is an hybrid IC with a build-in MOSFET and control IC, designed for flyback converter type switch
mode power supply applications.

5-9-2 Power supply primary part operations

An oscillator generates pulses signals which turn on and off a MOSFET transistor.
5-9-2-1 Start-up circuit : V
IN
The start-up circuit is used to start and stop the operation of the control IC, by detecting a voltage appearing at V
IN
pin (pin 4).
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