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參數(shù)資料
| 型號： | TDA9533 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PZFM15 |
| 封裝： | PLASTIC, MULTIWATT-15 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 248K |
| 代理商： | TDA9533 |
TDA9533
7/16
6 - THEORY OF OPERATION
6.1 - General
The TDA9533 is a three-channel video amplifier
supplied by a low supply voltage: V(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 (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 / 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-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
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TDA9535 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:9.5NS TRIPLE HIGH VOLTAGE VIDEO AMPLIFIER |
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| 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 |
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