STV9556 STMicroelectronics, STV9556 Datasheet - Page 12

• Manufacturer Part Number: STV9556
• Manufacturer: STMicroelectronics

Specifications of STV9556

• Single Supply Voltage (typ): Not RequiredV
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Mounting: Through Hole
• Lead Free Status / RoHS Status: Specific Sites Compliant

STV9556
10 APPLICATION HINTS
10.1 How to choose the high supply voltage value (V
The V
video adjustment but set to minimum value to avoid unecessary power dissipation.
Example (see
The following example shows how the optimum V
Case 1:
10V Brightness (C) adjusted by the preamplifier :
Case 2:
10V Brightness (C) adjusted by the G1 anode:
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
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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– Cut-off adjustment range (B) : 25V
– Max contrast (D) : 40V
V
V
V
V
DD
DD
DD
DD
DD
= A + B + C + D + E
= 15V + 25V + 10V + 40V + 17V = 107V
= A + B + D + E
= 15V + 25V + 40V + 17V = 97V
high supply voltage must be chosen carefully. It must be high enough to provide the necessary
Figure
2):
Figure
DD
16) provides efficient protection without deteriorating
voltage value is determined:
.
DD
) in DC coupling mode