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Isolated 5V 5-10ma supply

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ali_asadzadeh:
Thanks for suggestions, The isolation from primary to secondary is about 1Kv and secondary to secondary is about 500V, the links for the transformers are useful, but they would fail the production due to the cost! who would pay 7.7$ on a single transformer |O |O |O we have 0.03MUC and 0.07 DC motor driver, we should be able to find some sub 0.1$ transformer too.

ebclr:
The easiest and cheaper way will be buying one ready to use

https://pt.aliexpress.com/item/32970698143.html?spm=a2g0o.productlist.0.0.32b2ad14r3Nb1E&algo_pvid=dcbdee7c-994d-480f-af12-58c746218f39&algo_expid=dcbdee7c-994d-480f-af12-58c746218f39-25&btsid=0727019c-b39d-44fc-b1b6-765fe6496c6a&ws_ab_test=searchweb0_0,searchweb201602_9,searchweb201603_53

Marco:

--- Quote from: ali_asadzadeh on December 10, 2019, 06:41:38 am ---we should be able to find some sub 0.1$ transformer too.

--- End quote ---

Chinese UU9.8 common mode filters seem to get close to that.

David Hess:

--- Quote from: rvalente on December 10, 2019, 01:54:26 am ---Ethernet transformer could be pretty cheap due to the high production volumes
--- End quote ---

Ethernet transformers could work but I have not tried them myself.  The inverter frequency would need to be higher but should still be feasible.

GreggD:
B0505S-1W

200mA out
About 68% eff
Requires a 10% load
Keep load capacitors below 47uF

10pcs for $7.20 USD, free shipping

https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20191210125104&SearchText=b0505s

I just ordered boards today from JLCPCB that have one on it as well as the mentioned UU9.8 choke.

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