Converting 6vac to 5vdc, A little help please.

[Mysteryname]

With a load the voltage didn't go over 10VDC. but If I ride down hill I will expect the voltage to become much higher than that. Because I am spinning the wheel by hand.

I have compiled a list and a order form.
LM2575's are only ever sold in bulk, So I found LM2595-5 (fixed at 5 volts) I read the datasheet cover to cover and I made a selection of all my components from the recommended list. Based on the variables of the circuit.

I was lucky to come across another built switch mode regulator very similar to one the I'm building. That helped identify the components that I'll be using.

I'll be ordering the parts very soon then building a prototype on the bread board.
then simulating all the variables that I can before soldering the circuit together.

This is the component list. All the extra caps will not be used.. I just cant order any less of them.

But this has come a long way with amazing help from you guys. Thanks so much for helping me this much.

 

[(*steve*)]

That choke doesn't look right.

Edit: It's a common mode choke. It's used to suppress transients. It might have the right inductance (100uH) but what will you do with the extra winding (nothing I expect)

 

[Resqueline]

Yep, a common-mode noise choke can't be used in that application, it's meant to have the return current through the other winding (w/o it'll saturate at around 10mA DC).

 

[Mysteryname]

Ah OK.
The spec sheet required a 100uH @ 1.47A, That inductor was the closest to those specs.

If I'm looking for a "general purpose" inductor. I can only find inductors that are rated for a maximum of 0.67A where I need one that can handle 1.47A.

Another Inductor I'm looking it is a 2A 100uH "choke inductor" This one exceeds the specs that is required so it shouldn't saturate, right?

 

[(*steve*)]

If you can give us a link to those specs...

The common mode choke is designed to operate with current flowing in each coil, effectively cancelling out the magnetic field generated by each coil.

 

[Mysteryname]

http://docs-asia.origin.electrocomponents.com/webdocs/00ad/0900766b800ad9bc.pdf

Thats all for that particular inductor. It doesn't have a second coil to cancel out the magnetic field.. 744 70 21 (approx half way down the list.)

 

[Resqueline]

That one seems like it will work well.
Switchmode supplies needs a little headroom on the inductor current since there's a triangular ripple current around the dc output current level.
You never know at which level the coil will saturate. Most manuf's however will make it happen around the stated current (which is what the wire will take, not the core).
Some brands can stand up to twice the rated current before saturating though. In flyback switchmode designs this headroom becomes very important.

 

[NickS]

Personally I am partial to coilcraft inductors. But I don't know what there international policies are. I have used this inductor(MSS1260-104ML) with that switcher and it runs like a champ.