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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 320K |
| 代理商： | STV8172A |
9/14
STV8172A
Application Hints
4.3.1
Centring
When idle, both driver outputs provide i
cm
and the yoke current should be null (R
1
is negligible),
hence:
4.3.2
Peak Current
Scanning current should be I
P
when positive and negative driver outputs provide respectively
i
cm
- i
p
and i
cm
+ i
p
, therefore
and since R
7
= R
2
:
Choose R
1
in the 1
range, the value of R
2
= R
7
follows. Remember that i is one-quarter of driver
peak-peak differential signal! Also check that the voltages on the driver outputs remain inside
allowed range.
●
Example: for i
cm
= 0.4mA, i = 0.2mA (corresponding to 0.8mA of peak-peak differential
current), I
p
= 1A
Choose R
1
= 0.75
, it follows R
2
= R
7
= 1.875k
.
4.3.3
Ripple Rejection
Make sure to connect R
7
directly to the ground side of R
1
.
4.3.4
Secondary Breakdown Diagrams
The diagram has been arbitrarily limited to max I0 (2 A).
Figure 8: Output Transistor Safe Operating Area (SOA) for Secondary Breakdown
icm
R7
icm
R2 therefore R7
R2
=
=
icm
i
–
(
)
R7
Ip
R1
icm
i
+
(
)
R2
+
=
Ip
i--
R1
2R7
–
=
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