LM5072 Tranformer selection

Ferhat Bayir

Intellectual 290 points

Other Parts Discussed in Thread: LM5072, TPS23756EVM, TPS23753A

I want to make POE Power has aux input 10-35V and output 5V more than 2.5A with LM5072.

I need help for flyback transformer selection. I didnt understan how to select it acording to aux input range.

Regards

Ferhat Bayır

over 11 years ago

0 Darwin Fernandez over 11 years ago

TI__Mastermind 41790 points

Hi Ferhat,

If you are looking for a design to evaluate in your system, I recommend looking at the TPS23756EVM design as a start. This is 12V/24V/48V adapter capable with minimum rated aux input of 10V and meets your output power requirements. Please see below product page.

http://www.ti.com/tool/TPS23756EVM?keyMatch=tps23756&tisearch=Search-EN

For new class 3 designs. I recommend looking into the TPS23753A IC instead of LM5072. Below is its product page.

http://www.ti.com/product/TPS23753A?keyMatch=tps23753a&tisearch=Search-EN

There is an app note using the TPS23753A and design guidelines to designing your converter based on the your minimum input voltage (among other operating conditions). Please see below.

http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=slva305&fileType=pdf

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LM5072 Tranformer selection