Use of LNK304 For ISOLATED Application
Dear All,
I have a query related to use of LNK304 for isolated flyback converter.
As per datasheet details, LNK304 is specified as suitable for building non-isolated power supplies.
However in one of the appliaction note (web: http://www.powerint.com/en/design-support/reference-designs/design-examples)
Di-124, it's used in ultra widerange power supply design (for Utility meters).
I just want to is it safe, reliable and suitable to make use of LNK304 in isolated power supply design?
Regards
Amit
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Hi Spocks,
Thanks for your reply. I want to highlight following points with reference to LNK304. With reference toe design/application note di124.pdf posted on PI website
I have following doubts:
1. The stack MOSFET shown is P-Channel, I believe it should be n-channel. (P/N given also is of N-channel MOSFET - IRFBC20)
2. Is the shown opto-coupler connection correct? When I made circuit with the connection, there is no o/p coming. If I connect like: Emitter of Opto to ground (secondary) and collector to FB pin of LNK304, then o/p starts coming
Regarding 1) Yes its supposed to be a N channel. The symbol should be corrected
Regarding 2) No. the connection of opto is correct. See http://www.powerint.com/sites/default/files/PDFFiles/di124.pdf or http://www.powerint.com/sites/default/files/PDFFiles/der58.pdf for a design example using LNK-TN in Flyback topology
Yes its perfectly safe. There is a design spreadsheet available for Linkswitch-TN family in PIXls application. You can use that to do your prototype. Other than that use the same guidelines as LinkSwitch-XT family for flyback designs