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參數(shù)資料
| 型號： | STV202 |
| 英文描述： | TV Power Schematic |
| 中文描述： | 電視電源原理圖 |
| 文件頁數(shù)： | 30/46頁 |
| 文件大?。?/td> | 528K |
| 代理商： | STV202 |
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STV2001
30/
46
Due to the large output stage voltage range (E/W
Pin Cushion, Keystone), the combination of the
tracking function, maximum vertical amplitude,
maximum or minimum vertical position and maxi-
mum gain on the DAC control may lead to output
stage saturation. This must be avoided by limiting
the output voltage with appropriate I
2
C register
values. For the E/W part and the dynamic horizon-
tal phase control part, a sawtooth-shaped differen-
tial current in the following form is generated:
I’ = k’
.
(V
OUT
-
V
DCMID
).
Then
I and
I’ are added and converted into volt-
age for the E/W part.
Each of the two E/W components or the two dy-
namic horizontal phase control components may
be inhibited by their own I
2
C select bit.
EW output voltage is available at EWout pin direct-
ly. External buffer circuit is required to drive Dar-
lington pair transistor, which is sinking the DIODE
MODULATOR current in order to achieve EW cor-
rection. Additionally, an I
2
C controlled DC shift is
used for H-width.
The dynamic horizontal phase control drives the
H-position internally, moving the HFLY position on
the horizontal sawtooth in the range of
±
2.8 %T
H
both for side pin balance and parallelogram.
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