# AC-DC converter

#### praondevou

Joined Jul 9, 2011
2,942
I'm looking for a tiny AC-DC converter 120VAC to 5VDC. It doesn't have to have more than 50mA output current.

I found this http://www.recom-international.com/pdf/Powerline-AC-DC/RAC01_02-SC.pdf on Digikey, but $14 is too expensive. There are some which are not isolated for$6, but I wanted them to be isolated.

main thing here is they have to be CHEAP.
Has anyone had this problem and found something? I don't want to build one by myself because it's going to be more expensive (component count).

Thanks

#### praondevou

Joined Jul 9, 2011
2,942

#### iONic

Joined Nov 16, 2007
1,650
This is much too big, but now that you brought up the idea I'll have a look inside to see how big the circuit is, I have several of those.

Thanks
They don't leave much room for spare change in there so the case dimensions are pretty much what you have inside.

Last edited:

#### praondevou

Joined Jul 9, 2011
2,942
hey don't leave much room for spare change in there so the case dimensions are pretty much what you have inside.
Well, then it's too big... should a quarter of this at most.

#### iONic

Joined Nov 16, 2007
1,650
Well, then it's too big... should a quarter of this at most.

I think in this situation, money talks! 120VAC to 5VDC is not easy.
It can be done without isolation, but I am not going to venture here.

#### praondevou

Joined Jul 9, 2011
2,942
It can be done without isolation, but I am not going to venture here.
Yes, for sure, and for a few mA it's not difficult. But I need them to be isolated.
Thanks

#### iONic

Joined Nov 16, 2007
1,650

#### praondevou

Joined Jul 9, 2011
2,942
I've seen it before and it made me smile.
Too big with a 60Hz transformer and I guess more expensive than the off-the shelf encapsulated devices.

EDIT: I found one , it's the BP5710 from ROHM, but 12V and $12, still too expensive Last edited: #### blueroomelectronics Joined Jul 22, 2007 1,757 I found one , it's the BP5710 from ROHM, but 12V and$12, still too expensive
Buy thousands, they'll be much cheaper.

#### Kermit2

Joined Feb 5, 2010
4,162
How are you going to satisfy your polar opposite requirement?

If one with a transformer is to big, you need a switching supply, if they are too expensive, then you need a non isolated supply, if you must have isolated then you are back to the transformer type.

???

Problem is the 60Hz transformer, they are too big. They sell 5V wall chargers for $2, new. That means they could produce such converters. It's all a question of quantity. What I'm looking for is simply not being mass produced, that seems to be the problem... Rohm also has the BP5063-5 for$8.86 USD in single quantities.