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TDA9556 Datasheet(PDF) 8 Page - STMicroelectronics

No. de pieza TDA9556
Descripción Electrónicos  7.5 NS TRIPLE-CHANNEL HIGH VOLTAGE VIDEO AMPLIFIER
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA9556 Datasheet(HTML) 8 Page - STMicroelectronics

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6.3 - Amplifier gain and cut-off adjustment
A very simplified schematic of each TDA9556
channel is shown in Figure 3.
The feedback net of each channel is integrated
with a built-in voltage gain of 19.3 (40k/2k).
The output voltage VOUT is given by the following
formula:
VOUT = (VG+1) x VREF - (VG x VIN)
for VG = 19.3 and VREF = 5.5V, we have
VOUT = 111.6 - 19.3 x VIN
Figure 3. Simplified schematic of one channel
7 ARCING PROTECTION
As the amplifier outputs are connected to the CRT
cathodes, special attention must be given to por-
tect 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 dy-
namic video response of the system.
The arcing network that we recommend (see
Figure 4) provides efficient protection without de-
teriorating the amplifier video performances.
The total resistance value between the amplifier
and the CRT cathode (R10+R11) should not be
less than 300
Ω.
Spark gap diodes are strongly recommended for
protection against arcing.
Figure 4. Arcing protection network (one channel)
2k
40k
GND
VDD
OUT
IN
VREF
+
-
R11
R29
10
150
Ω/0.5W
C18
100nF
C24
4.7
µF/150V
C12
100nF/250V
R19
33
R10
150
Ω/0.5W
L1
0.39
µH
D12
FDH400
F1
TDA9556
High Voltage (90-110V)
VDD
GND
OUT
Spark gap
(*)
(*): To be connected as close as possible to the device.


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