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AN4414 数据表(PDF) 5 Page - STMicroelectronics

部件名 AN4414
功能描述  Anti-tampering ferrite less power supply for 3-phase energy meter
PDF  20 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN4414 数据表(HTML) 5 Page - STMicroelectronics

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DocID025611 Rev 1
5/20
AN4414
Description of SMPS
20
1.1
Basic flyback equations
Generally the flyback design calculations are as below:
Equation 1
As we know:
Equation 2
Rewriting as below:
where:
Vdcmin = minimum DC input to flyback converter
Ipkp = peak primary current
Ton = turn-on time of primary switch (VIPer in this case).
Equation 3
Equation 4
where:
Dmax = maximum duty cycle
fsw = operating switching frequency of converter.
Equation 5
Equation 6
As we know, power = energy transferred x frequency.
Equation 7
where Pin = input transformer power.
VL
di
dt
-----
=
Vdcmin
Lp
Ipkp
Ton
------------
=
Ton
Dmax Ts
=
Ton
Dmax
fsw
----------------
=
Vdcmin
Lp
Ipkp fsw
Dmax
----------------------------
=
Ipkp
Vdcmin Dmax
Lp f
 sw
--------------------------------------------
=
Pin
1
2
--- Lp Ipkp
2
fsw
=



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