I purchased SMPS transformers online but they did not come with datasheet. They are of several sizes: PC40/EE8.3; PC40/EE13; PC40/EE16; PC40/EE19; and more. The manufacturers do not seem to have datasheels for them. It's difficult proceeding with the power supply design.
Please, advise me on how to deal with this situation.
Well you do have the ferrite material so you can get all the specs for the core (Bs, Br, Hc etc.) on the web (see TDK PC40). You can also measure the P/S ratio, leakage inductance, magnetizing inductance etc. Depends what you are looking for..
Well you do have the ferrite material so you can get all the specs for the core (Bs, Br, Hc etc.) on the web (see TDK PC40). You can also measure the P/S ratio, leakage inductance, magnetizing inductance etc. Depends what you are looking for..
All of the reputable core manufacturers publish datasheets.
Who is the vendor?
To design a transformer, you will require a some parameters that you won't be able to measure yourself.
Saturation flux density Bs, remanence Br, and core loss.
By the way, this last parameter, varies with frequency.
All of the reputable core manufacturers publish datasheets.
Who is the vendor?
To design a transformer, you will require a some parameters that you won't be able to measure yourself.
Saturation flux density Bs, remanence Br, and core loss.
By the way, this last parameter, varies with frequency.
I don't know how it sounds to you but I am saying that from product review, other customers (people that also bought and had used the cores in their designs already) said the cores worked for them. There are no datasheets for the cores as far as I know.
All I know about these cores are that they are PC40 and EE-something.
However, because people said they worked for them, then I believe they work. I don't know how they went about getting them to work and I can't contact them to ask them for help on that.
I don't sense anything contrary in what I said. You probably just misunderstood me.
I need help to be able to use them in power supply designs even when there are no datasheets for them.
Please, if you have some help on that, render it to me. Thanks.
However, if you want, , assume its like N87 or 3c94 ferrite and find a core of similar area, and calculate.
Asuume Bsat = 0.3mT.
Calculate isat = Bsat.A.N/L
.....then wind somethign up and see how it goes.....wear goggles.
Measure temp of core....check that the ferrite can handle your Fsw and deltaB without overheating.
Look at the current, see if it shows signs of saturating.
Is it flyback or Bridge that you design?
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i think EE cores are quite similar in geometry to ETD cores, and ferroxcube have datasheets for those.
I've gotten some PC40 datasheet for the same core sizes that I have, although from a different manufacturer. I'll go with that for now to see what I get. Thanks.