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參數(shù)資料
| 型號： | TEA2029C |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | COLOR TV SCANNING AND POWER SUPPLY PROCESSOR |
| 中文描述： | 彩電掃描和電源處理器 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 104K |
| 代理商： | TEA2029C |
widens out to a search window and there is no
delay of frame fly-back (direct synchronization).
FrameScanning
FRAME SAW-TOOTH GENERATOR. The current
to chargethecapacitoris automaticallyswitched to
60Hzoperation to maintain constant amplitude.
FRAME PHASE MODULATOR (WITH TWO DIF-
FERENTIAL INPUTS). The outputsignal is apulse
at the line frequency,pulsewidth modulatedby the
voltageat the differential pre-amplifier input.
This signal is used to control a thyristor which
provides the scanning current to the yoke. The
saw-toothoutputisalowimpedance,however,and
can therefore be used in class B operation with a
power amplifier circuit.
Switch Mode Power Supply
(SMPS)
Secon-
dary to Primary Regulation
Thispowersupplyusesadifferentialerror amplifier
with an internal reference voltage of 1.26V and a
phase modulator operating at the line frequency.
Thepowertransistoristurnedoffbythefallingedge
of the horizontal saw-tooth.
The ”soft start” device imposes a very small con-
duction angle on starting up, this angle progres-
sively increasesto its nominal regulationvalue.
The maximum conductionanglemay bemonitored
by forcing a voltage on pin 15. This pin may also
be usedfor current limitation.
The outputpulseissenttotheprimaryS.M.P.S.I.C.
(TEA2261)via a lowcost synchro transformer.
SecurityCircuit and Start Up Processor
When the security input (pin 28) is at a voltage
exceeding 1.26V the three outputsare simultane-
ouslycutoffuntilthisvoltagedropsbelowthe1.26V
threshold again. In this case the switch mode
power supplyisrestarted bythe ”softstart” system.
If this cycle is repeated three times, the three
outputs are cut off definitively. To reset the safety
logic circuits, V
CC
mustbe zero volt.
This circuit eliminates the risk to switch off the TV
receiver in the event of a flash affecting the tube.
On startingup, thehorizontalandverticalscanning
functions come into operation at V
CC
= 6V. The
power supply then comes into operation progres-
sively.
On shutting down, the three functions are inter-
rupted simultaneouslyafter the first line fly-back.
ABSOLUTE MAXIMUMRATINGS (limitingvalues) T
amb
= 25
°
C (unless otherwise noted)
Symbol
Parameter
Min.
Max.
14
13.2
5
10
Unit
V
V
mA
mA
V
mA
mA
mA
mA
mA
mA
Supply Voltage (pin 8)
Operating Supply Voltage (pin 8)
AGC Current (pin 20)
Video Identification Current (pin 24)
Negative Line Retrace Voltage (pin 12)
Line Retrace Current (pin 12)
Line Output Current (pin 10)
Frame Saw-tooth Generator (pin 3)
Frame Output Current (pin 4)
SMPS Output Current (pin 7)
Safety Input Current (pin 28)
Safety Input Voltage (pin 28)
Common Mode Range (pins 1-2)
VCC
I
20
I
24
V
12
I
12
I
10
I
3
I
4
I
7
I
28
V
28
V
1
/V
2
Starting threshold
– 20
+ 10
40
20
100
40
5
V
CC
10
– 10
– 40
V
2
THERMAL DATA
Symbol
R
th (j-a)
Parameter
Value
55
Unit
°
C/W
Junction-ambient Thermal Resistance
2
ELECTRICALOPERATING CHARACTERISTICS
T
amb
= 25
°
C V
CC
= 12V (unless otherwise noted)Pulse duration at 50% of theampl.
Symbol
I
CC
SYNCH SEPARATOR (Pins 26-27)
Positive Video Input AC Coupled (output impedance of signal source < 200
)
–I
27
Negative Clamping Current (during synch, pulse)
I
27
Clamping Current - Pin for slicing level 0.2V < V
27pp
< 2V (50% of sync amplitude)
Parameter
Min.
Typ.
50
Max. Unit
80
Supply Current (pin 8, frame, line and SMPS output without load)
mA
0.2
- 25
3
1.8
- 40
6
3
V
pp
μ
A
μ
A
- 55
9
2
TEA2029C
4/9
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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| TEA2031A_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:COLOR TV EAST-WEST CORRECTION |
| TEA2037 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HORIZONTAL AND VERTICAL DEFLECTION MONITOR |
| TEA2037A | 功能描述:顯示驅(qū)動器和控制器 Horz/Vert Defl Montr RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
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