DocID025611 Rev 1

13/20

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

==

=