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AN701 Datasheet(PDF) 19 Page - Vishay Siliconix

Part No. AN701
Description  reduce the size of energy storage components
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Maker  VISHAY [Vishay Siliconix]
Homepage  http://www.vishay.com
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AN701 Datasheet(HTML) 19 Page - Vishay Siliconix

 
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AN701
Vishay Siliconix
Document Number: 70575
16-Jan-01
www.vishay.com
19
Therefore
N
N
P
N
S
+
1
0.35 + 2.86
The primary turns can be derived from the same equation used
for the forward converter output indicator:
N
min +
L
P xIpK
Bmax xAmin
N N
min + 14 Turns.
+
12
mHx 3 A
200 mT x 13 mm2
+ 13.85 Turns.
For 5 V, the number of turns will then be:
N
S + Npx0.35 + 14 x 0.35 + 4.9 T ] 5T
In the flyback converter, all windings appear in parallel with
each other, and will track the voltage of the controlled output.
Small variations will be present due to the differences between
Schottky and bipolar rectifiers. It must also be remembered
that this will also cause the bias winding to collapse under short
circuit conditions with possible overpower dissipation.


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