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STV9302A
Application Hints
4.2
AC-Coupled Applications
In AC-coupled applications (See
Figure 6
), only one supply (V
S
) is needed. The vertical position of
the scanning cannot be adjusted with input bias (for that purpose, usually some current is injected
or sunk with a resistor in the low side of the yoke).
4.2.1
Application Hints
Gain is defined as in the previous case:
Choose R
1
then either R
2
or R
3
. For good output centering, V
7
must fulfill the following equation:
or
Figure 6: AC-coupled Application
R
3
+Vs
R
2
R
1
Rd(*)
Yoke
Ly
(*)
recommended:
Ly
50
µ
s
-------------
Rd
Ly
20
µ
s
-------------
<
<
0.1µF
C
F
(47 to 100µF)
Power
Amplifier
Flyback
Generator
Thermal
Safety
470µF
Output
Current
Output
Voltage
I
p
000000000000000000
000000000000000000
000000000000000000
000000000000000000
000000000000000000
000000000000000000
7
3
2
5
6
1
4
V
M
V
m
+
-
000000000000000000
00000000000000000
00000000000000000
000000000000000000
000000000000000000
C
s
R
4
000000000000000000
C
L
R
5
0.22
µF
1.5
Ω
I
p
V
M
V
m
–
2
------------------------
R
2
R
1
R
3
×
----------------------
×
=
V
S
2
--------
V
7
–
R
4
R
5
+
----------------------
V
7
V
M
V
m
+
2
------------------------
–
R
3
--------------------------------------
V
7
R
2
-------
+
=
V
7
1
R
3
-------
ÿ
1
R
2
-------
+
×
1
R
4
R
5
+
----------------------
þ
V
S
2 R
4
R
5
+
(
)
------------------------------
V
M
V
m
+
2
R
3
×
------------------------
+
ÿ
þ
=
+
