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Power Integrations Engineer Power Integrations Moderatorre: STACKFET implementation
hi,
I m designing wide range input power supply (170V - 500 Vdc input) for our application. i found our PI designers have developed STACKFET method for high voltage input supply.I found DER-205 reference design in our PI website. But i need a step by step design method as like as TOPSWITCH flyback design topology application note.
(i) Is it available for STACKFET method? application notes.
(ii) then recommend the switch (TOP,TNY,LNK or else) to be used for the below spec..
input voltage:170-450Vdc
output 1:5v,2a
output2:12v,2a
output3:+12v,1a
output4:-12v,1a
total power : 60watts
if i select topswitch-jx model,i cant find the IC in PIXLS and PIExpert software for proceed further.
And if we choose,topswitch-hx can we follow our AN-47 for designing?
then,how to select the STAFET mosfet and other components which is used for stackfet implementation....
1 reply | Created on Jan 30, 2012 22:35 PM by s.manikandan
s.manikandan
If you do a search on our website for "StackFET" there should be some links to design note, app notes and some forum entries regarding how to implement StackFET in a design.
In general, you'll need to do the design in PI XLS. Specify your input conditions as they will actually be. To specify a DC input in PI XLS for TopSwitch-JX, you have to do a slight-of-hand work-around...specify a very large input capacitance (99999999999 uF) and then adjust the AC input RMS voltages until Vmin and Vmax in PI XLS match your input specifications.
At this point, you'll work on your design in PI XLS as you normally would. You'll get a consistent error message about Vdrain exceeding BVDSS for the device you're using but you can ignore that for now. Work on iterating your design until you're satisfied.
Once you've reached this point, you'll implement the StackFET topology in your schematic. The StackFET topology really doesn't change much between product families. The basic idea is to insert another MOSFET in front of the drain terminal to reduce the voltage across our IC below 700V.
If you go through some of our current design examples as well as our archived design examples, there should be some designs for utility meter applications (typically high-voltage three phase). These should have some explanations of StackFET as well. I hope this helps. Please let me know if you need any further assistance.
-The Traveler
PI - Traveler | 206 posts 