STV9555 ST Microelectronics, STV9555 Datasheet - Page 13

• Manufacturer Part Number: STV9555
• Description: 9.5 ns TRIPLE-CHANNEL HIGH VOLTAGE VIDEO AMPLIFIER
• Manufacturer: ST Microelectronics

Figure 16. Arcing protection network (one channel)
10.3 Arcing protection: layout and decoupling
Several layout precautions have to be considered to get the optimum arcing protection:
100nF/250V
GNDA
(
(**): R19 must be mandatorily used
(***): Ground separation network
*
): To be connected as close as possible to the device
C12(*)
Sparkgap grounding: when an arc occurs, the energy must flow through the CRT ground without
reaching the amplifier. This is obtained by connecting the sparkgap grounding (point B) to the CRT
ground (socket) via a wide/short trace. Conversely the point B must be connected to the amplifier
ground via a longer/narrower trace.
Grounding separation: In order to set apart the amplifer ground and CRT ground, the R29/C29 net-
work
Amplifier grounding: The 3 grounds GNDS, GNDA and GNDP must be connected together as
close as possible to the device.
STV9555
(Figure
GNDS
16) can be used.
V
GNDP
DD
OUT
110 /0.5W
C29(***)
R29(***)
0.22 F
33-40
1-10
R19(**)
R10
FDH400
D12
V
FDH400
DD
D13
4.7 F/150V
0.33 H
C24
L1
110 /0.5W
R11
Spark gap
100nF
C18
200V
F1
A
B
CRT
STV9555
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