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Help me to check my schematic on offline flyback.

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king_griffin

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I have recently made a schematic based on datasheet of this. I simulated it on LTSpice and I think it works. But honestly, I do not understand how to calculate each value clearly. Could you help me to solve it? At least some key points such as R2, R5. Thanks alot
Capture.JPG
 

Hi,
R5=Visense/Ipri_Pk
R2=Vin_min/Istart
 

How can I cal Ipri_Pk? It's my eternal question.
 

Search for this document on the internet: "Design Guide for Off-line Fixed Frequency DCM Flyback Converter."

Follow the steps that's provided. However, if you designed your transformer for CCM, then search for a design guide of Offline CCM flyback converter.

Bear in mind the frequency that you designed the transformer for. Also bear in mind that the peak Vds mUstinov be below the Vds_rating of the mosfet.Leave some headroom of at least 20%. To make it easier, design for duty cycle below 50%.
 
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