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參數(shù)資料
| 型號： | TDA8145 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TV EAST/WEST CORRECTION CIRCUIT FOR SQUARE TUBES |
| 中文描述： | 電視東/西校正電路方形管 |
| 文件頁數(shù)： | 4/5頁 |
| 文件大小： | 81K |
| 代理商： | TDA8145 |
LM
5
TDA8145
R5
RT3
1k
Hfly
from L.T.
Keystone
Adj.
Line Transformer
(L.T.)
Pin 1
Voltage
H. Width
Pin-cushion
adjustment
RT2
L1
10mH
R3
4.7k
47k
7
2
1
3
4
8
6
C1
47nF
R4
18k
V
S
C2
100nF
D1
1N4148
C3
4.7nF
R2
12k
RT1
100k
R1 =
V
FRAME
66
μ
A
PP
V
FRAME
8
APPLICATION CIRCUIT WITH KEYSTONE CORRECTION
CIRCUIT OPERATION
(see the schematic diagram)
A differential amplifier OP1 is driven by a vertical
frequency sawtooth current of
±
33
μ
A which is
produced via an external resistor from the sawtooth
voltage. The non–inverting input of this amplifier is
connected with a reference voltage corresponding
to the DC level of the sawtooth voltage. This DC
voltage should be adjustable for the keystone cor-
rection. The rectified output current of this amplifier
drives the parabola network which provides a para-
bolic output current.
This output current produces the corresponding
voltage due to the voltage drop across the external
resistor at pin 7.
If the input is overmodulated (> 40
μ
A) the internal
current is limited to 40
μ
A. This limitation can be
used for suppressing the parasitic parabolic current
generated during the flyback time of the frame
sawtooth.
A comparator OP2 is driven by the parabolic cur-
rent. The second input of the comparator is con-
nected with a horizontal frequency sawtooth
voltage the DC level of which can be changed by
the external circuitry for the adjustment of the pic-
ture width.
The horizontal frequency pulse–width modulated
output signal drives the final stage. It consists of a
class D push–pull output amplifier that drives, via
an external inductor, the diode modulator.
TDA8145
4/5
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| TDA8146 | EAST/WEST CORRECTION FOR RECTANGULAR TV-TUBES |
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| TDA8170 | TV VERTICAL DEFLECTION OUTPUT CIRCUIT |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TDA8145_04 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TV EAST/WEST CORRECTION CIRCUIT FOR SQUARE TUBES |
| TDA8146 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:EAST/WEST CORRECTION FOR RECTANGULAR TV-TUBES |
| TDA8153 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:RGB VIDEO OUTPUT AMPLIFIER |
| TDA8160 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:INFRARED REMOTE CONTROL RECEIVER |
| TDA8170 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:TV VERTICAL DEFLECTION OUTPUT CIRCUIT |
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