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參數(shù)資料
| 型號： | TDA9106 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LOW COST DEFLECTION PROCESSOR FOR MULTISYNC MONITORS |
| 中文描述： | 低成本多頻監(jiān)聽音箱偏轉(zhuǎn)處理器 |
| 文件頁數(shù)： | 24/30頁 |
| 文件大?。?/td> | 319K |
| 代理商： | TDA9106 |
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III - VERTICAL PART
III.1- GeometricCorrections
The principle is representedin Figure21.
Startingfrom the verticalramp, a parabolashaped
current is generated for E/W correction, dynamic
horizontal phase control correction, and vertical
dynamicFocus correction.
The base of the parabola generator is an analog
multiplier the output current of whichis equalto :
I = k
(V
OUT
- V
DCOUT
)
2
Where Vout is the vertical output ramp, typically
comprisedbetween2and5V,Vdcoutisthevertical
DC output adjustablein the range 3.2V
≥
3.8V in
orderto generateadissymetricparabolaif required
(keystoneadjustment).
Corner and Corner Balance corrections may be
addedto theE/W one.These are respectively 3rd
and 2nd order waveforms.
In order to keep a good screen geometry for any
enduser preferencesadjustmentwe implemented
the “geometry tracking”.
Due to large output stages voltage range (E/W,
FOCUS), the combinationof trackingfunctionwith
maximum vertical amplitude max or min vertical
position and maximum gain on the DAC control
Figure 21 :
GeometricCorrections Principle
OPERATINGDESCRIPTION
(continued)
mayleadto theoutputstagessaturation.Thismust
be avoided by limiting the output voltage by apro-
priate I
2
C registersvalues.
ForE/WpartandDynamicHorizontalphasecontrol
part, a sawtooth shaped differential current in the
followingform is generated:
I’= k’
(V
OUT
- V
DCOUT
)
2
Then
I and
I’ are addedtogetherand converted
into voltagefor the E/W part.
Each of the four E/W components or the two Dy-
namicHorizontalphasecontrolonesmay beinhib-
ited by theirown I
2
C selectbit.
TheE/Wparabolais availableon Pin31 bytheway
of anemitterfollower whichhas tobe biasedbyan
externalresistor(10k
). It canbe DCcoupled with
externalcircuitry.
The output connectionof thevertical Dynamic Fo-
cus is the same as the E/W one.
This reverse parabolais available on Pin 32.
Dynamic Horizontal phase control current drives
internally the H-position, moving the Hfly position
on the Horizontalsawtoothin the range
±
2.8%Th
both on SidePinBalanceand Parallelogram.
EWOutput
EWamp
Keystone
Corner
CornerBalance
Sidepinamp
Parallelogram
VerticalDynamic
FocusOutput
SidepinBalance
OutputCurrent
To Horizontal
Phase
VDCOUT
VDCIN
2
VDCOUT
VDCOUT
VMID
VerticalRamp V
OUT
VerticalRamp V
OSC
31
32
9
TDA9106
24/30
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