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参数资料
| 型号： | TDA8145 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 偏转 |
| 英文描述： | EAST-WEST CORRECTION IC, PDIP8 |
| 封装： | MINI, POWER, PLASTIC, DIP-8 |
| 文件页数： | 5/9页 |
| 文件大小： | 128K |
| 代理商： | TDA8145 |
5/9
TDA8145
Figure 6. Application Circuit with Keystone Correction
CIRCUIT OPERATION
(see the shematic diagram)
A differential amplifier OP1 is driven by a vertical
frequency sawtooth current of ± 33A which is
produced via an external resistor fromthe saw-
tooth voltage. The non–inverting input of this am-
plifier is connected with a reference voltage
corresponding to the DC level of the sawtooth volt-
age. This DC voltage should be adjustable for the
keystone correction. The rectified output current of
this amplifier drives the parabola networkwhich
provides a parabolic 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 (> 40A) the internal
current is limited to 40A. This limitation can be
used for suppressing the parasitic parabolic cur-
rent 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.
LM
5
TDA8145
R5
RT3
1k
Hfly
from L.T.
Keystone
Adj.
Line Transformer
(L.T.)
Pin 1
Voltage
H. Width
Pin-cushion
adjustment
L1
10mH
R3
RT2
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
A
PP
V
FRAME
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