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5-8 Power supply (STR-F6654)
5-8 -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.
5-8 -2 Power supply primary part operations
An oscillator generates pulses signals which turn on and off a MOSFET transistor.
* 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
pin (pin 4).
IN
D801
R819
D802
Main AC voltage
D804
C804
C803
D803
R802
Power supply start-up circuit
- 39 -
Service manual CP-785A
T801 SMPS TRANS
2
C805
C806
Drain
I801 STR-F6653
Ground
5
6
7
4
R805
D805
L801
3
4
Vin
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