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參數(shù)資料
| 型號(hào)： | TDA9556 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PZIP11 |
| 封裝： | PLASTIC, CLIPWATT-11 |
| 文件頁數(shù)： | 20/22頁 |
| 文件大小： | 315K |
| 代理商： | TDA9556 |
TDA9556
7/22
6
THEORY OF OPERATION
6.1
General
The TDA9556 is a three-channel video amplifier supplied by a low supply voltage: VCC (typ.12V) and a
high supply voltage: VDD (up to 115V).
The high values of VDD 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).
In normal operation, the output video signal must remain inside the linear region whatever the cut-off,
brightness and contrast adjustments are.
Figure 2. Output signal, level adjustments
(A) Top Non-Lin ear Region
Linear
region
VDD
(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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