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參數(shù)資料
| 型號： | TEA2028-TEA2029 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | APPLICATION NOTE |
| 中文描述： | 應(yīng)用筆記 |
| 文件頁數(shù)： | 30/47頁 |
| 文件大小： | 532K |
| 代理商： | TEA2028-TEA2029 |
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MAXIMUMCAPTURE TIME
The worst case capture time occurswhen the first
syncpulse just precedes the syncwindow.
Let’sfind the number of periods necessary for the
captureto occur,i.e. tn = 0.
T
L
T
W
T
L
T
SYNC
, T
L
=
23ms , T
W
=
7.3ms
- 50Hz: the numberof periodsis 6
T
CAPTURE(MAX)
= 120ms
- 60Hz: the numberof periodsis 3
T
CAPTURE(MAX)
= 50ms
n
=
V.6.3.3 - Frame blanking signal
This signal is necessayto blank the displayduring
each frame flyback.It is triggeredat the beginning
of frame saw-tooth flyback. The duration of this
signal is 1.344ms(or 21 lines).
This ”frame blanking” signal is available through
Pin 4 (TEA2028 only) which is an open-collector
output.
It is alsopresentwithin thenormalizedsupersand-
castlesignal on Pin 11(TEA2028 and TEA2029).
V.6.3.4 - Frame blanking safety
(TEA2028 only,
for TEA2029 refer to section VII.5)
Itsdutyis to protectthephosphorcoatingof picture
tubein caseof anyproblem with vertical deflection
functionsuch as scanning failure.
Asignal to monitorcorrect scanningis providedby
the frameyoke and appliedto Pin 2.
Incaseofanyfailure,allframeblankingoutputsare
disabled and go high thereby blanking the entire
screen.
During tracephase, the voltage acrossframe yoke
hasaparabolicalshapeduetothecouplingcapaci-
tor in series with yoke. During frame flyback, the
current through frame yoke must be rapidly in-
verted. Conventionally, a two-fold higher supply
voltage is applied across the yoke. This will pro-
duce an overvoltagecalled ”flyback”.
The safety monitoring status is detected on the
falling-edge of flyback, i.e. at the beginning of
scanning.Adifferentiatornetwork is usedto trans-
mit only fast voltagevariations.
Therequiredpulseisthencomparedto1.26Vlevel.
Frame blankinggoes high in the absenceof nega-
tive pulse (zero deflection current) or if the pulse
does not fall within the first 21 lines (exagerated
over-scanning).
Frame
Sawtooth
Sync
Pulses
Wide
Window
0
t
W
t
N
t
2
t
1
= 0
(capture)
T
L
T
SYNC
2
Figure59
12
μ
s
20
μ
s
L335
L22
1.344ms
(21 lines)*
First Frame
Second Frame
Frame Blanking
(Pin 4)
* 24 lines for TEA2029C
2
Figure60
TEA2028 - TEA2029APPLICATIONNOTE
30/46
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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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