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Power supply topology opinion

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bowman1710

bowman1710

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Hi guys,

Specification

200-400V DC input
isolated output: 30V @ 1A
switching frequency 300Khz

What topology would you use for this?
 

Simple flyback.
 

300khz at the 400v is going to give you a hot FET with a flyback. But its doable.
You could always go for a LLC with eg one of those integrated fairchild LLC chips that has the two fets, drivers and controller on the same chip. Wind the transformer simply, sec over primary, and add another series resosonant inductor to get it to your wanted performance regarding the vout vs frequency graph.
 

Why does it have to run at 300 Khz
Why not 30 Khz ?

I have never understood why the very first thing people decide on is the switching frequency, then run into insurmountable difficulties designing the magnetics.
 

Hi,

Switching frequency:

With high sensitive analog applications containing ADC and DACs i try to use continous switching SMPS and synchronize it somehow to the same clock source as the ADC/DAC.

This generates only predictable "alias frequencies" that can easily eliminated. Often it only generates DC offset.

In any case a good pcb layout and a solid GND plane is essential.

Klaus
 

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