DAEWOO ELECTRONICS DTE-21U6TH, Руководство по обслуживанию

Страница: 40 / 63

Service manual CP-785AF
- 39 -
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
IN
pin (pin 4).
R819
D802
D801
D803
D804
C804
C803
R802
C806
C805
Main AC voltage
2 7
6
4
D805
R805
L801
4
Ground
Drain Vin
T801 SMPS TRANS
3
I801 STR-F6653
5
Power supply start-up circuit