DAEWOO ELECTRONICS DTE-21U6TH, Service Manual

Page: 42 / 63

Service manual CP-785AF
- 41 -
* STR-F665X oscillating operation
T O P I N 4 SM PS
2
3
1
5
G N D
R804
C850
OCP/FB
From PIN 6
SM PS
( F E E D B A C K )
SOURCE
R808
D R A I N
D R I V E
OSC
Rg2
Rg1
Comp.2
Comp.1
C1
R1
STR-F6653
1.35mA
V th(1)
V th(2)
Oscillating operation
O N
O N O N
O F F
O F F O F F
M O S F E T s w i t c h i n g O N / O F F
V
D S
( M O S F E T d r a i n - s o u r c e v o l t a g e )
I
D
( M O S F E T d r a i n c u r r e n t )
P i n 1
( O C P / F B )
0 V
0 . 7 3 V
( S T R - F 6 6 5 3
i n t e r n a l c a p a c i t o r )
C 1
3 . 7 V
6 . 5 V
1
3
2
4
Waveforms during oscillating operation