NEC DTE-29U1TH Service Manual page 42

* STR-F665X oscillating operation
STR-F665X
OSC
Comp.2
C1
R1
C 1
( 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 )
P i n 1
( O C P / F B )
I
D
( M O S F E T d r a i n c u r r e n t )
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 )
M O S F E T s w i t c h i n g O N / O F F
D R I V E
Comp.1
V th(1)
1.35mA
V th(2)
Oscillating operation
6 . 5 V
3 . 7 V
0 . 7 3 V
0 V
O N
Waveforms during oscillating operation
Rg2
Rg1
1
2
O F F O N O F F
-41-
Service Manual CP-785F
3 TO PIN4 SM PS
D R A I N
2
SOURCE
R808
1
From PIN 6
OCP/FB
SM PS
( F E E D B A C K )
C850
5
G N D
3
4
O N
O F F
R804