Reference design for Kaschke SP-E 36/11 - URGENT
Hy,
we've to design a 24V/4A power supply(Uin = 85 - 265V). We want to use the kaschke SP-E36/11 flyback transformer. We also want to use the TopSwitch - Series. Are u able to recommend me any reference design suitable for this transformer?
Which TopSwitch familiy suits best for my problem? I ve tried to get a schematic with the PI Expert 9.0 but the Kaschke SP-E36/11 isnt in the component library.
Is it possible to add the transformer? Ive only the data with is related in the datasheet(see attachment)!
Thanks & regards
Christoph
Comments
Hy!
In the meantime i collected the following data from the transformer. AL of the ungapped core 3120nH. AL 180nH gap 1mm.
Primary windings re 186 turns. cross section 126mm2, core factor 0,656. I would choose the TopSwitch 248YN.
I get the 24V at the output but if i do a load at the output the voltage drops nearly to zero. I checked the signal at the control pin of the topswitch. Without the load its like it should be, but with the load i fall back into the open loop, short-circuit mode.
The schematic is from the pi expert. Did i forget any key factor of the transformer? Do you have any idea for improvement!?
Thanks & regards
Christoph
Furthermore in the datasheet of the transformer is mentioned that it is suitable for the TopSwitch 248. Therefore I thought that you can provide a reference design for this application. I already talked to Kaschke support and they said i should talk to the PI support.
regards
christoph
Christoph -
With the additional information you gathered about the core, you can add a new component (transformer/core) to the component library in PI expert. When you have that added, you would start a design and then fill in some of your known parameters (primary number of turns, secondary number of turns, inductance, etc) and then have PI Expert "Optimize design with fixed parameters".
Depending on how many errors you get, it may become a trial and error situation and PI XLS might be more useful.
-The Traveler
There really doesn't seem to be enough information provided on the transformer documentation to complete a design. This is a common problem associated with using off-the-shelf transformers. For example, the PDF gives you the different turns ratios but doesn't give you the actual number of turns which is something you would need in order to complete a design in PI Expert. I would highly reccomend building your own transformer or requesting more detailed build information from the transformer vendor.
-The Traveler