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Posted by: sonam on 03/12/2012


The question is regarding the connection between the feed back pin and Q2 in the schematic (in with capacitor design) while in Surge ckt(Without cap), there is no connection between them.
Can u please explain the cycle for the Q2,Q3 ckt with or without cap to get the idea of how it works?

Thanx & Regards


Submitted by PI-Dunwell on 03/13/2012

The network formed by Q2 and Q3 are for open load function. Q2 collector is connected to FB pin of LNK419 as shown in Figure 4.This should not be different with Fig 3. Its a typo error (on Fig 3) and I'll feedback it to the engineer. Good catch.