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Power Integrations Engineer Power Integrations ModeratorHow to compute the Reset and Clamp circuitry ?
I am designing a universal AC input 21V 3A output using a TOP247Y.
This is the first time I design such a switching power supply and I'm not so sure how to design the Clamp and Reset circuitry for that power.
I went thru the AN31 but I'm still unable to figure out the components value.
Attached is my PIExpert design.
Please help me.
Regards.
4 replies | Created on Aug 2, 2008 07:58 AM by Chris
Chris
It was a bit dificult if you have the correct diodes and a good transformer the circut will work but if you transformer is not good than it will never work and the diodes at the clamp will blow. You may contact Ep-Co elektronic for the correct transformer I buy from there. arge@epcoelektronik.com
regards
sabahaddin babacan | 1 post
hello,
pls do not go with TOP 247Y because it may be a older part, a new version of series TOP-Hx is already out. Pls refer data book & select the device suitably based on power specification,enclosure & Operating line.
Also, yes, PI-XLS software is available of PI web itself for better snubber design.
prasun | 76 posts
PI Expert version 7.0 now includes clamp circuit design. For example for your design it will recommend a RCD clamp circuit and will recommend initial values for the components based on the estimated leakage inductance and the peak primary current.
PI-Spock | 695 posts 