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AN4414 Fiches technique(PDF) 13 Page - STMicroelectronics

No de pièce AN4414
Description  Anti-tampering ferrite less power supply for 3-phase energy meter
PDF  20 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4414 Fiches technique(HTML) 13 Page - STMicroelectronics

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AN4414
Description of SMPS
20
input as 360 V till 440 VAC input mains, hence the peak current through the device is
limited.
Looking into the waveform in Figure 8, at maximum mains input of 440 VAC (Vdcmax ~ 360
VDC to flyback input), the peak current through the device is 211 mA.
Equation 36
We have:
Figure 2. CH1: FB signal, CH3: drain current, CH4: drain source voltage at 100 VDC
Ipkp
Vdcmax Tonmin

Lp
--------------------------------------------------
360V 400ns
680
H
-------------------------------------
211mA
==
=



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