3.3v 80ma power supply for energy meter
i want to design a power supply for single phase energy meter with following specifications
(using switched power supply)
1. 3.3 v and 5 v
2. 80mA
3. upto 4Watt power
4. flyback topology
5. low cost and high efficiency
please help me ..
Comments
my input will be 85-288VAC. I dont need to worry about high voltage issues right now at least..
if i get 5v output only then also it is fine. I can add some few more components to get 3.3v
my input will be 85-288VAC. ..i checked that stack FET . my input voltage range is different from that.
The lower input voltages you have in your application make the project easier than I initially thought.
Based on the power levels you've described, LinkSwitch-CV would be a good fit for your needs. If you want one of our Reference Design Kits, RDK-201 would be a good one to start with. It's only a single output design but it would give you an idea about where to start. When you have a better idea of what your final specs will be, you can optimize a new design using our PI Expert Design Software.
RDK-201 Documentation:
http://www.powerint.com/sites/default/files/PDFFiles/rdr201.pdf
Regards,
The Traveler
instead of lnk625 that you have mentioned ,can i use lnk304 . what are the differences between them?
LNK304 is part of the LinkSwitch-TN product line. It offers a simpler control scheme and a generally simpler design. It's also a bit better suited for non-isolated designs although flyback designs can be created with it.
The LinkSwitch-CV product line has a more advanced controller and will give you better load and line regulation, better efficiency, light-load operating characteristics, etc.
Regards,
The Traveler
We actually have a section on our website for Utility/Energy/Smart Meters:
http://www.powerint.com/en/applications/utility/power-meters
Without knowing your input specifications, isolation requirements, etc, I can't fully make a reccomendation but there are a dozen different Reference Designs and Design Ideas on this page to help you get started.
Often with Utility/Energy Meter questions, the issue of high input voltages comes up. If this is the case for your application, I would recommend searching on our website for our StackFET solution for these appliacations.
Here is one of our guides/explanations of StackFET:
http://www.powerint.com/en/community/papers-circuit-ideas-puzzlers/circuit-ideas/-high-voltage-input-switching-power-supply-usi
Here is one of our Reference Designs that uses StackFET:
http://www.powerint.com/sites/default/files/PDFFiles/der105.pdf
Let me know if I can be of further help.
Regards,
The Traveler