Author Topic: New to Designing an Isolated Flyback Converter  (Read 656 times)

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Offline EzequielTopic starter

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  • Country: ar
New to Designing an Isolated Flyback Converter
« on: January 21, 2022, 02:07:30 pm »
Hello! I need to design an isolated flyback converter with the following specs:

Input: 4.5V-20V
Output: 5.5V // 1A

Is there any tool that could help me to design this circuit?
I have run into many ic controllers, but in all the design examples I end up having to design a transformer, and I try to avoid it. Do you know any supplier that has a catolog to look for a part that suits my application?
Or should I start learning to design a transformer for this particular application?

The IC I've been looking:
LT8304
MAX17691
BD7F100HFN-LB

Any help would be appreciated.
Thanks.
 

Offline coromonadalix

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  • Country: ca
Re: New to Designing an Isolated Flyback Converter
« Reply #1 on: January 21, 2022, 03:26:35 pm »
Why not buy already made dc-dc converters,  you have some isolated models with a wide input voltage range   around 10 to 20$ usd ??


Exemple

We use this one : non isolated   5v at 2 amp output
Input voltage from 6.5 to 32vdc ?? 

For a mere 15$ usd, the price as risen a little, we paid them 12$ usd

https://www.mouser.ca/ProductDetail/RECOM-Power/R-78B50-20?qs=X3130gGoUctzFy6YRarmwA%3D%3D

In your country   you must have electronic part resellers ??

Designing a board could be costly and time consuming

You have tons of designs on a google search    your terminology is : ''isolated dc-dc converter''  not a flyback converter

« Last Edit: January 21, 2022, 03:28:48 pm by coromonadalix »
 

Offline pardo-bsso

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  • Country: ar
Re: New to Designing an Isolated Flyback Converter
« Reply #2 on: January 21, 2022, 05:38:19 pm »
To add some context, 10u$s to 20u$s is a lot of money here.

And also importing stuff is near impossible at times.

But I concur with you. There has to be something local here that's close to what Ezequiel needs.
 

Offline Benta

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Re: New to Designing an Isolated Flyback Converter
« Reply #3 on: January 21, 2022, 08:22:32 pm »
For voltages and currents as standard as this, I see no reason for throwing a lot of effort into an own design.
And is importing a ferrite core and bobbin easier than importing a module?

 

Offline flowib

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  • Country: nl
Re: New to Designing an Isolated Flyback Converter
« Reply #4 on: January 23, 2022, 05:42:40 am »
If it werent for the weird 4.5V requirement, i could do a board in two hours flat.


Wurth Electronics has a standard transformer catalog https://www.we-online.com/catalog/en/pbs/power_magnetics

So does the Polish Ferryster but its hard to find the list of available models on their website.

Delta Elektronika fanboy.
Does collecting boat anchors count as going to the gym?
 


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