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AN2623 Datasheet(PDF) 14 Page - STMicroelectronics

Part # AN2623
Description  Evaluation board for off-line forward converter based on L5991
PDF  25 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2623 Datasheet(HTML) 14 Page - STMicroelectronics

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Design circuit
AN2623
14/25
Choosing the crossover frequency
it is possible to place
compensator zero fzc around
and the compensator pole fpc above
.
Considering R3=5.6 kΩ, R5=15 kΩ, CTR=1 Ω were calculated, choose the following values:
C12=1 nF, C8=6 nF, R7=20 kΩ .
f
c
0.1
f
sw
f
c
5kHz
=
⇒
⋅
≅
f
c
3
----
f
zc
1600 Hz
=
⇒
3f
c
f
⇒
pc
15 kHz
=
⋅



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