LNK6404 Current Limit - Varies with load

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It seems the LNK6404 reduces its current limit (through primary) as the power drawn by load reduces. This helps with audible noise in transformer.
Is there anything that explains this operation for the devices? I don't see the feature mentioned in datasheet.
Also, can this result in poorer regulation when a step load is applied?


Hi rkumar,

Thank you for your interest on PI product. With regards to your question, yes the current limit decrease as the load reduces to helps in audible noise as you've said as well as to increase efficiency. This algorithm are also same with several other PI products released on the market. As for the step load, PI product is an ON-OFF controller, so the response is fast enough to maintain the regulation.

Best Regards,