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參數(shù)資料
| 型號： | TEA2028-TEA2029 |
| 廠商： | 意法半導體 |
| 英文描述： | APPLICATION NOTE |
| 中文描述： | 應(yīng)用筆記 |
| 文件頁數(shù)： | 19/47頁 |
| 文件大?。?/td> | 532K |
| 代理商： | TEA2028-TEA2029 |
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Turn-off Delay
12
μ
s
64
μ
s
Blanking Time
Center of
Screen
Line Transistor
Collector Current
t
LF
Saturation
Turn-off
LINE TRANSISTOR
CONTROLOUTPUT
LINE
FLYBACK
LINE YOKE
CURRENT
VIDEO SIGNAL
ON CATHODES
0
0
2
Figure 35
1
10
12
A
mA/
μ
s
i
t
2 PhaseComparator
t’
OUT
Phase
Modulator
V
16
f(p)
Low-pass
Filter
Monostable
(29
μ
s)
HorizontalPhase
Adjustment
Output
Stage
(x 1)
Inhibition
t
OUT
Line
Yoke
EHT
Transformer
Line
Deflection
Stage
x 1
LF Pulse
Shaping
LF
t
OUT
t’
OUT
29
μ
s
Constant
Delay
by
1
2
Signal
Video
(Pin 27)
t
IN
Line
Flyback
2
Figure 36 :
SecondPhase LockedLoop ”
2” Block Diagram
V.5 - Second PhaseLocked Loop ”
φ
2”
This stage controls the horizontaldeflection of the
electron beam i.e., the horizontalpicturescanning.
Thefrequencyofoperation,in theabsenceofvideo
signal, is a multiple of the VCO frequency, i.e.
15625Hz- 500Hz.
When video signal is present, the scanning fre-
quency is synchronized with the video signal
through the first phaselocked-loop ”
φ1
”.
The output rectangularwaveform signal drives the
line switching transistor. This transistor, when
turned-off,generateswhat is commonly called the
”line flyback”.
In order to obtain a horizontally centered picture,
thelineflyback(LF) mustcoincidewiththeblanking
time on tube cathodes.
The turn-off delayis due to transistor basestorage
time. This time varies in different TV sets as the
transistors employedmayhave differentoperating
characteristicswhich are functionsof temperature
variations, powerrating and base drive.
Therefore, it follows that in order to obtain stable
image centering, the line flyback must be phase-
locked with respect to the video signal.
The second phase-lockedloop also offersthe pos-
sibility of horizontalphase-shiftadjustment.
TEA2028 - TEA2029 APPLICATIONNOTE
19/46
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PDF描述 |
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| TEA2028 | APPLICATION NOTE |
| TEA2028B | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT |
| TEA2128 | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT |
| TEA2164S | SWITCH MODE POWER SUPPLY PRIMARY CIRCUIT |
| TEA2029C | COLOR TV SCANNING AND POWER SUPPLY PROCESSOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| TEA2031A | 功能描述:視頻 IC East/West Correction RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| TEA2031A_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:COLOR TV EAST-WEST CORRECTION |
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