Supplier for SMPS transformers?

No matter how you toss and turn it that'll be a custom part. If cost is critical and quantities are high you can have it made in China. Otherwise there are also European companies who can do that.

--
Regards, Joerg

http://www.analogconsultants.com/

El 06-08-11 16:16, Nico Coesel escribió:

Hello Nico,

Maybe you can also specify the frequency range of operation, insulation requirements, supply voltage, primary inductance, maximum leakage inductance (when important) and number of units.

Wim PA3DJS

Please remove abc first in case of PM

If you do need to go custom, try Minntronics. Ask for Butch. He's a really good magnetics designer.

John

Frequency and inductance are not fixed, the rest of the circuit can be designed around it. Insulation requirement is 500V (standard) no agency approvals necessary because it is not isolated. 100 units is a good start but a bit low for a custom design. If all goes well my customer expects to sell way more though.

--
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
nico@nctdevpuntnl (punt=.)
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Buy the core sets and the bobbins and make them yourself. Wise to use Litz on the primary to maximize efficiency.

Insulation requirement ... not isolated ... huh?

John's supplier might do such a small run. If you want something more local I haven't dealt with these company personally but they make custom ferrite transformers:

But be prepared to pay some hefty NRE with such low quantities.

--
Regards, Joerg

http://www.analogconsultants.com/

"Joerg"

** Could mean the output is connected to safety ground - ie not GROUND isolated. ** Lice ?

... Phil

I mean the input and output have a common ground but the wiring should be able to withstand a couple of hundred volts.

I have dealt with ISE before for a custom low-profile flyback transformer. Not bad but it took them 3 tries to get the leakage inductance down to acceptable levels.

I'm afraid so. I'll contact these companies and see if they have something semi-custom off the shelf. Otherwise I have to fit 6 ETD39 transformers on a long eurocard.

--
Failure does not prove something is impossible, failure simply
indicates you are not using the right tools...
nico@nctdevpuntnl (punt=.)
--------------------------------------------------------------

Hello Nico,

When you are in a stage that not everything is fixed already (nice), try to do it yourself. You can find a reasonable optimum between the transformer itself and the components around it (FET's, snubbers, decoupling capacitors, etc). When done, you can have it made by some other company.

Not all companies have the design expertise they claim to have. They may hire some external expertise to do the job.

Even when you find a COTS part, you will probably subject it to (severe) testing. Of course I understand when you can use some of the shelf component it may save costs.

Wim PA3DJS

Please remove abc first in case of PM