Electronics > Projects, Designs, and Technical Stuff

Isolated 5V 5-10ma supply

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SiliconWizard:
Also, maybe you could specify your isolation requirements (voltage) first (primary to secondaries and secondary to secondary...)

Then of course the solution would also depend on factors like cost vs. quantity, area/volume taken, EMI, ...

David Hess:

--- Quote from: ali_asadzadeh on December 08, 2019, 06:11:31 am ---Thanks david, I was thinking of driving the primary with a dirt cheap DC motor driver part, something like this
https://lcsc.com/product-detail/Motor-Drivers_MX116_C113342.html
--- End quote ---

I do not see any specifications for speed.  Above 20 kHz is typical.  Some gate driver ICs are suitable.


--- Quote ---do you suggest any circuit for your idea? since my product would be manufactured in volumes and each single unit is cost sensitive and should have 16 channel of isolated 5V supplies, I should design something reliable and dirt cheap( maybe with all chinese parts from lcsc)
--- End quote ---

The transformer will be the difficult part.  Gate drive and pulse transformers are suitable if you want to get something from Coilcraft or someone to experiment with.

rvalente:
This is siemens S7 1200 RS485 board, you can see their aproach using the MAX253 to drive the trafo.

You coud do something similar, with multiple winding in the secondary. Lets say 4 outputs per trafo.



https://datasheets.maximintegrated.com/en/ds/MAX253.pdf


--- Quote from: David Hess on December 09, 2019, 02:45:53 am ---
--- Quote from: ali_asadzadeh on December 08, 2019, 06:11:31 am ---The transformer will be the difficult part.  Gate drive and pulse transformers are suitable if you want to get something from Coilcraft or someone to experiment with.


--- End quote ---

Using pulse transformers would be very elegant design, since some of them are 1:1


--- End quote ---

David Hess:

--- Quote from: rvalente on December 10, 2019, 12:10:48 am ---Using pulse transformers would be very elegant design, since some of them are 1:1
--- End quote ---

A lot of standard pulse transformers are trifillar 1:1:1 and some are quadfillar 1:1:1:1.

https://www.mouser.com/Power/Transformers/Pulse-Transformers/_/N-8u9sj?P=1yqdy9r

rvalente:
Ethernet transformer could be pretty cheap due to the high production volumes

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