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參數(shù)資料
| 型號(hào)： | AN-23 |
| 英文描述： | TinySwitch Flyback Design Methodology |
| 中文描述： | 據(jù)稱，TinySwitch反激式設(shè)計(jì)方法 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 401K |
| 代理商： | AN-23 |
AN-23
A
7/99
10
Step 22.
Determine feedback circuit and output post filter.
The output voltage of the
TinySwitch
flyback power supply
should be sensed at the first output capacitor, which is before
the output post LC filer. This way the output post LC filter
is outside the feedback control loop and the resonant
frequency of the output post LC filter can be as low as
required to meet the output ripple specification requirement.
Use Zener diode in series with the optocoupler LED.
Output voltage V
O
is determined by
V
V
V
O
Z
LED
=
+
where
V
LED
≈
1V
Replace the Zener with a TL431 for better output accuracy.
In non-isolated design, use a bipolar NPN transistor in place
of the optocoupler. Replace the LED with the base emitter
junction and connect the collector to the ENABLE pin of the
TinySwitch
.
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