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Feed-back Circuit
T801
.
6
.
3
4
.
1
1J.26049.031
C837
0.033U K
C819
0.22U M
Fig. 2 shows the feedback circuit consists of a lamp, C846, D809, R825, R827 and C837.
With the lamp current through D809, a half sin-waveform voltage signal is produced. We
may get the Maximum value through R825/R827/C837.
After OZ9938 gets the feedback voltage signal from PIN5, the duty of the PWM driver
outputs is decided.
F1
C814
C816
5P D
27P J
7
C817
27P J
C815
C838
3.3N J
4700P J
F2
8
R819
3M
R820
3.3K F
R827
R825
422 F
422 F
R823
100K
J
D805
BAV99
J
D806
BAV99
Fig. 9
- 47 -
TP801
CN801
1
1
TP802
2
2
2062204102
C846
0.01U K
K
A
D809
BAV99
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