what is the efficiency of Viper26 at low load, as low as 10% load?

[PIbra.1]

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[Peter BENSCH]

Welcome, @PIbra.1​, to the community!

The efficiency depends, among other things, strongly on the respective input voltage and the switching frequency: at high frequencies, the passive components can become smaller, but the switching losses increase.

The best way to check the behaviour is with a simulator, such as the free eDesign Suite:

Power Management Design Center > Power Supply Design Tools > AC/DC > Isolated > FF Flyback

There you can, for example, click on the magnifying glass symbol at the top right of the small window that visualises the efficiency in order to see it enlarged.

Does it answer your question?

Regards

/Peter

[PIbra.1]

Hello Peter!

Thank you for your answer!

I have DC input. 175VDC to 415VDC. I need very high efficiency, even at 10% load.

which Viper du you think will match that?

[Peter BENSCH]

You could take a look at the VIPer38L and simulate it using the eDesignSuite.

Good luck!

If the problem is resolved, please mark this topic as answered by selecting Select as best. This will help other users find that answer faster.

/Peter

[PIbra.1]

Thank you Peter

[Peter BENSCH]

I just remembered another hint: the eDesignSuite can only handle the VIPer38 as ACDC converter (of course we both know that such a switching regulator is actually a DCDC because the ACDC conversion is done by the diode bridge ;)).

So if you want to simulate the VIPer38 with eDesignSuite, but you have DC as input voltage, please convert it numericallY to AC by dividing by square root 2, because the parameter input expects AC values.

Regards

/Peter