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參數(shù)資料
| 型號： | TDA9535 |
| 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)： | 12/15頁 |
| 文件大?。?/td> | 1749K |
| 代理商： | TDA9535 |
TDA9535
6/15
6 THEORY OF OPERATION
6.1 - General
The TDA9535 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 out-
put 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 (B: typ. 25V)
– Video contrast (D: typ. up to 40V),
– Brightness (C: with the remaining voltage
range).
In normal operation, the output video signal must
remain inside the linear region whatever the cut-
off / brightness / contrast adjustment is.
Figure 2. Output signal, level adjustments
6.2 - How to choose the high supply voltage value (VDD)
The VDD high supply voltage must be chosen care-
fully. It must be high enough to provide the neces-
sary video adjustment but set to minimum value to
avoid unecessary power dissipation.
Example:
The following example shows how the optimum
VDD voltage value is determined:
– Cut-off adjustment range (B) : 25V
– Max contrast (D) : 40V
Case 1:
10V Brightness (C) adjusted by the preamplifier :
VDD =A + B +C +D +E
VDD = 15V + 25V + 10V + 40V + 17V = 107V
Case 2:
10V Brightness (C) adjusted by the G1 anode:
VDD =A + B +D +E
VDD = 15V + 25V + 40V + 17V = 97V
(A) Top Non-Linear Region
Lin
ear
r
egion
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
2
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TDA9536 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:7.5 NS TRIPLE HIGH VOLTAGE VIDEO AMPLIFIER |
| TDA9550 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:TV signal processor-Teletext decoder with embedded m-Controller |
| TDA9556 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:7.5 NS TRIPLE-CHANNEL HIGH VOLTAGE VIDEO AMPLIFIER |
| TDA955X | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:TV signal processor-Teletext decoder with embedded m-Controller |
| TDA955XN1 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:TV signal processor-Teletext decoder with embedded m-Controller |
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