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參數(shù)資料
| 型號(hào)： | STV8172A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Vertical Deflection Booster for 3-APPTV/Monitor Applications with 70-V Flyback Generator |
| 中文描述： | 垂直偏轉(zhuǎn)助推器與70 - V反激式發(fā)電機(jī)3-APPTV/Monitor應(yīng)用 |
| 文件頁(yè)數(shù)： | 6/14頁(yè) |
| 文件大?。?/td> | 320K |
| 代理商： | STV8172A |
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Application Hints
STV8172A
6/14
4.1.1.1 Centering
Display will be centered (null mean current in yoke) when voltage on pin 7 is (R
1
is negligible):
+
------------------------
=
4.1.1.2 Peak Current
Example: for V
m
= 2 V, V
M
= 5 V and I
P
= 1 A
Choose R
1
in the1
range, for instance R
1
=1
From equation of peak current:
Then choose R
2
or R
3
. For instance, if R
2
= 10 k
, then R
3
= 15 k
Finally, the bias voltage on pin 7 should be:
4.1.2
Ripple Rejection
When both ramp signal and bias are provided by the same driver IC, you can gain natural rejection
of any ripple caused by a voltage drop in the ground (see
Figure 5
), if you manage to apply the
same fraction of ripple voltage to both booster inputs. For that purpose, arrange an intermediate
point in the bias resistor bridge, such that (R
8
/ R
7
) = (R
3
/ R
2
), and connect the bias filtering
capacitor between the intermediate point and the local driver ground. Of course, R
7
should be
connected to the booster reference point, which is the ground side of R
1
.
Figure 5: Ripple Rejection
V7
+
---------------------
×
IP
-VM
Vm
–
(
)
2
R1xR3
----R2
×
=
-------
2
-----------------------------
×
×
–
2
3
--
=
=
V7
VM
Vm
+
2
1
R3
R2
-------
+
------1
×
7
2
2.5
-1
×
1.4V
=
=
=
R
3
R
2
R
1
Rd
Yoke
Ly
Power
Amplifier
Flyback
Generator
Thermal
Safety
7
3
2
5
6
1
4
+
-
R
7
R
8
R
9
Reference
Voltage
Ramp
Signal
Driver
Ground
Source of Ripple
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