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| 型號(hào)： | TEA2028 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | APPLICATION NOTE |
| 中文描述： | 應(yīng)用筆記 |
| 文件頁(yè)數(shù)： | 26/47頁(yè) |
| 文件大?。?/td> | 532K |
| 代理商： | TEA2028 |
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B. STUDYOF SHIFT ADJUSTMENT
With R, P network connected to Pin 16, the t
out
becomes :
t
OUT
=
BR
′
I
IN
1
+
T
2
+t
D
59.7
μ
s
1
+
T
2
+
BR
′
R
KV
CC
1
+
T
2
With : T2 = ABR’(where R’ = R //R
IN
) andK
∈
[0;1]
Substitutingthe following values into above equa-
tion :
- R = 470k
- R’ = 470k
//25M
= 46k
- A= 17
×
10
-6
A/
μ
s
- B = 16
μ
s/V
- t
d
= 10
μ
s
- T
2
= 125
- V
CC
= 12V
- t
OUT
= - 38ns - 390ns+ 1.5
μ
s
×
K
thereforet
out
= 1.5
K - 0.43 ( in
μ
s )
If K varies between0 and 1
t
out
[-0.43ms to 1.07
μ
s]
which correspondsto a picture displacement of :
LINE
[- 4mm to + 11mm].
Shift variationsas a functionof V
CC
(with adjustment)
BR
′
R
K
1
+
T
2
T
2
dt
OUT
dV
CC
=
≈
BR
′
R
K
≈
K
AR
= K
0.12
μ
s/V
dL
dV
CC
= 0.34mm/V
at K
NOMINAL
= 0.28
Therefore, a constant V
CC
must be appliedto the
potentiometer.
V.6 - Verticaldeflection driver stage
This stage must constantly drive the vertical spot
deflection.Suchdeflectionwillhorizontallyscan the
screen from top to bottom thus generating the
displayed image. Similar to horizontal deflection,
the verticaldeflectionis obtainedby magneticfield
variationsof a coil mountedon thepicture tube.
A saw-tooth current at frame frequency will go
through this coil commonly called ”frame yoke”.
Frame period is the time required for the entire
screen to be scannedvertically.
C.C.I.R.andN.T.S.C.TVstandardsrequirerespec-
tively 50Hz and 60Hz Frame Scanning Frequen-
cies.Also, a full screen display is obtained by two
successivevertical scanningssuchthatthesecond
scanning is delayed by a half line period with
respect to the first.
This method increases the number of images per
second (50 half images/s or 50 frames/s in 50Hz
standard). This scanning mode called ”Interlaced
Scanning” eliminates the fliker which would have
been otherwise produced by scanning 25 entire
imagesper second.
The circuit willgeneratea saw-toothvoltagewhich
is linear as a function of time and called ”frame
saw-tooth”. A power amplifier will deliver to the
”frame yoke” a current proportional to this saw-
tooth voltage. It is thus clear that this saw-tooth
voltage reflects the function of the vertical spot
deflection; which must itself be synchronized with
the video signal. Synchronization signals are ob-
tained from an extraction stage which will extract
the useful signal during line pulse inversion of the
composite sync signal.
Synchronizationoccurs at the end of scanning, in
other words, when the saw-tooth voltage at Pin 5
is reset. This function is accomplished by the
”frame logic circuitry” of full digital implementation.
This processing method offers various advan-
tages :
-
Accurate free-running scanning frequency
eliminates the frequencyadjustment requiredby
previous devices.
-
Digital synchronization
locked onto half line
frequencytherebyyielding perfect interlaced dis-
playandexcellentstabilitywithnoisyvideosignal.
-
Automatic 50/60Hz standard recognition
and
switching the correspondingdisplay amplitude.
-
Optimizedsynchronizationin VCR mode.
-
Generationof variousaccuratetimeintervals
,
such as narrow ”sync windows” thus reducing
considerablythe vertical image instabilityincase
of forinstance,mainsinterference,superimposed
on framesync pulse.
-
Generationof vertical blanking
signal for spot
flyback and to
protectthe picture tube in case
of scanningfailure.
TEA2028 - TEA2029APPLICATIONNOTE
26/46
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| TEA2164S | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT |
| TEA2029C | COLOR TV SCANNING AND POWER SUPPLY PROCESSOR |
| TEA2031A | COLOR TV EAST-WEST CORRECTION |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA2028B | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:COLOR TV SCANNING AND POWER SUPPLY PROCESSOR |
| TEA2028-TEA2029 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:APPLICATION NOTE |
| TEA2029 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:APPLICATION NOTE |
| TEA2029C | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:COLOR TV SCANNING AND POWER SUPPLY PROCESSOR |
| TEA2029CV | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Timing Processor (LINE, FRAME, SMPS) for TV Sets |
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