LNK306D Blow Up
Hi,
I designed a Constant Voltage Buck Converter with LNK306. My reference is LNK306 datasheet Figure 5. I changed the R1 to 3.9K for 5V output and used 22uf 400V for C4, C5 not used. Rectification type is bridge.
When I applied the AC mains LNK306 is blowing up. I checked the layout and tried several times change the chip and board. But there is no difference.
What can effect the IC's blowing up except layout mistakes?
Best Regards,
Comments
Sorry to resurrect an old thread, but I'm looking for possible fatal issues in a design I am working on before I order boards.
Why do you suggest that L2 be removed? Is that because C5 is not being installed?
Thanks!
Yes, if C5 is not being installed, the L2 will cause a very high voltage on the LNK TN drain source during the turn off, that may cause the blowing up of the device.
Would you please check?
did you removed L2 from the circuit and put a solid wire instead of it? You have to.