參數(shù)資料
型號(hào)： STV9556
廠商： 意法半導(dǎo)體
元件分類： 運(yùn)動(dòng)控制電子
英文描述： 7.5 NS TRIPLE-CHANNEL HIGH VOLTAGE VIDEO AMPLIFIER
中文描述： 7.5納秒三通道視頻放大器高壓
文件頁(yè)數(shù)： 7/24頁(yè)
文件大?。?/td> 698K
代理商： STV9556
STV9556
7/24
In normal operation, the output video signal must remain inside the linear region whatever the cut-off,
brightness and contrast adjustments are.
6
THEORY OF OPERATION
6.1
General
The STV9556 is a three-channel video amplifier supplied by a low supply voltage: V
CC
(typ.12V) and a
high supply voltage: V
DD
(up to 115V).
The high values of V
DD
supplying the amplifier output stage allow direct control of the CRT cathodes (DC
coupling mode).
In DC coupling mode, the application schematic is very simple and only a few external components are
needed to drive the cathodes. In particular, there is no need of the DC-restore circuitry which is used in
classical AC coupling applications.
The output voltage range is wide enough (
Figure 2
) to provide simultaneously :
– Cut-off adjustment (typ. 25V)
– Video contrast (typ. up to 40V),
– Brightness (with the remaining voltage range).
Figure 2. Output signal, level adjustments
(A)
Top Non-Linear Region
L
V
DD
(E)
Bottom Non-Linear Region
GND
Blanking pulse
Video Signal
(B) Cut-off Adjust. (25V Typ.)
(C) Brightness Adjust. (10V Typ.)
(D) Contrast Adjust. (40V Typ.)
15V
17V
3
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