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Non isolated dc- dc converter

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Bjtpower

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I am looking to design a Non-isolated DC-DC Converter with POWER Integration Tool.

Input specs:90-270VAC

Output:12v-500mA (Max)

The design should be transformeless.. can include only inductors cos it is Non-isolated converter.
I have gone thru Linkswitch in PI-Expert, But i am not getting the Non isolated design options.

Kindly Help with weblinks

Marx
 

Using a flyback converter with small transformer will give much better efficiency than a single inductor buck converter, whether you want an isolated design or not. Because the switched power of a buck converter is input current * output current, resulting in respective switching losses. A Vin/Vout ratio above 20 isn't suitable for a buck converter.
 

Bjtpower said:
I am looking to design a Non-isolated DC-DC Converter with POWER Integration Tool.

Input specs:90-270VAC

Output:12v-500mA (Max)

The design should be transformeless.. can include only inductors cos it is Non-isolated converter.
I have gone thru Linkswitch in PI-Expert, But i am not getting the Non isolated design options.

Kindly Help with weblinks

Marx
Click to expand...


If you cannot use transformers... and keep high efficiency maybe you have to employ interleaved bucks.
As FvM says... i think it's not a good idea to use buck converter...but here it is a simple calculator to design it fastly:
https://www.daycounter.com/Calculators/Switching-Converter-Calculator.phtml
 

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