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參數(shù)資料
| 型號： | 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)： | 4/22頁 |
| 文件大?。?/td> | 315K |
| 代理商： | TDA9556 |
TDA9556
12/22
10
APPLICATION HINTS
10.1
How to choose the high supply voltage value (VDD) in DC coupling mode
The VDD high supply voltage must be chosen carefully. It must be high enough to provide the necessary
video adjustment but set to minimum value to avoid unecessary power dissipation.
Example (see Figure 2):
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
10.2
Arcing Protection: schematics
As the amplifier outputs are connected to the CRT cathodes, special attention must be given to protect
them against possible arcing inside the CRT.
Protection must be considered when starting the design of the video CRT board. It should always be
implemented before starting to adjust the dynamic video response of the system.
The arcing network that we recommend (see Figure 16) provides efficient protection without deteriorating
the amplifier video performances.
The total resistance between the amplifier and the CRT cathode (R10+R11) protects the device against
overvoltages. We recommend to use R10+R11 > 200
.
Spark gaps are strongly recommended for arcing protection.
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