LT3748 Flyback controller

TChin on Jul 16, 2021

Hi,

I would like to design LT3748 Isolated power solution to our PoE PSE source.

Following is our specification:

Vin: 14V (+-) 10%

Vout: 48V@250mA

There is a reference design on ADI website(see following link), but its transformer size is too big to fit in our design.We don't need such high power output.

https://www.analog.com/media/en/technical-documentation/user-guides/dc1860bfa.pdf

Based on our Vin/Vout requirement, could you please suggest a suitable solution to us ? or suggest a transformer to us?

Thanks!

TChin

0 W.G

on Jul 17, 2021 6:44 PM
This transformer probably would work for your application.
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0 TChin on Jul 19, 2021 2:25 AM in reply to W.G

Hi W.G,

Thank you for your answer. We will change the solution from LT3748 to LT8302-3 as your suggested circuit.

By the way, the current rating of secondary side of transformer Wurth(750313457) is 48mA~180mA. Do you

think it is a risk to our design specification 250mA ? (see attached or below picture)

PDF

Thanks!

TChin
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0 W.G

on Jul 19, 2021 4:12 PM in reply to TChin
The transformer should work well for your application.

However, the LT8302 may not be able to provide your targeted output power. If true, the LT3748 can be used along with this transformer.
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0 TChin on Jul 22, 2021 11:42 AM in reply to W.G

Hi W.G

Okay, Thanks!
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