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AN4414 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN4414
Description  Anti-tampering ferrite less power supply for 3-phase energy meter
PDF  20 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4414 Datasheet(HTML) 6 Page - STMicroelectronics

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Description of SMPS
AN4414
6/20
DocID025611 Rev 1
The primary inductance is calculated as:
Equation 8
Equation 9
where:
= efficiency of flyback stage
Pout = output power required.
Equation 10
Using Equation 10, we can rewrite Equation 6 as:
Equation 11
Reflected voltage is defined as:
Equation 12
RMS primary current is:
Equation 13
Turn ratio, n is defined as:
Equation 14
where:
Np = number of primary turns
Ns = number of secondary turns.
Lp
2Pin
Ipkp
2
fsw
-------------------------------
=
Pin
Pout
-------------
=
Lp
2 Pout
 Ipkp
2
fsw
-----------------------------------------
=
Ipkp
2Pout
 Vinmin Dmax
-----------------------------------------------------
=
VR
Dmax
1Dmax
–

------------------------------ Vdcmin
=
Iprms
Ipkp
Dmax
3
----------------
=
n
VR
Vout VF
+
---------------------------
Np
Ns
--------
==



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