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AN2450 Datasheet(PDF) 25 Page - STMicroelectronics

Part # AN2450
Description  LLC resonant half-bridge converter design guideline
PDF  35 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2450 Datasheet(HTML) 25 Page - STMicroelectronics

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AN2450
Design procedure
35
–
Step 9 - calculate the minimum operating frequency at full load and minimum input
voltage, according to the following approximate formula:
Equation 63
–
Step 10 - calculate the characteristic impedance of the resonant tank and all
component values (from definition):
Equation 64
fmin
fr
1
1
1
--- 1
1
Mmax
1
Qzvs
Qmax
-------------


4
+
---------------------------------------
–






+
-----------------------------------------------------------------
=
Zo
QzvsRac
=
Cr
1
2
f
rZo
-----------------
=
Lr
Zo
2
f
r
----------
=
Lm
Lr
-----
=



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