3.3V output add in DER-403

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Dear Sir,

I am designing Energy Meter using Microcontroller PIC or Arduino and wants to design suitable Power Supply for my Energy Meter.

I read DER-403 application note by using LNK6448k and tested on PI Expert Suite and matched all readings but it is 5VDC @ 2A output and

I want to add 3.3VDC output winding for 3.3VDC supply for Energy meter IC.


Thanks & Regards,
Engr.Hafiz Imran Ahmed.
Cell # +92-333-8876726.
Email : falcon7voyage@gmail.com.
Falcon Business Associates.
Karachi, Pakistan.

Hi Hafiz,
Do you need (a) dual output 5V@2A and 3.3V@1A, or (b) single output 3.3V@1A?
LNK-3 ICs are only recommended up to 12W output power. If you need (a), you can have an additional secondary winding for the 3.3V output but you will need to adjust the output power requirements. Or if you need (b), then you will need to adjust the transformer design as recommended by the PI Expert Suite.