4W AC/DC Converter Using tiny Switch -III family

[neeteen09]

Hi everyone,

I am designing a 4W AC/DC converter using Tiny Switch III family using PI Expert software.

I got the circuit attached herewith.

I choose setting in PI software as follows:-
Output Power- 0 to 5W
Input Type- Universal 85 to 265 V
no of outputs- 1
Isolated Supply - Yes
Output Type- CV/CC
Topology - Flyback
TinySwitch-III Family
Enclosure - Adapter
Operation Mode:- CV/CC
TinySwitch IC - TNY274PN

circuit is attached herewith.

What is the significance of L1,L2 , C1 & C2 int circuit ?

Please help.

Thanks in Advance.

 

[d123]

Hi,

L1 and L2? That is L2 and L3, right? Input (low pass) filter, at a guess. You'd have to look for an LC formula to find what frequency (/ies) they cut off at. Maybe the lower one is there to smooth current spikes or something. I do not know if my guesses are correct.

 

[Easy peasy]

L1, L2 are for DM & CM filtering, C1, C2 are for energy storage and DM filtering.