Hello all,

I would like to make a regular that will take 7v to 9v DC and to then regulate it to 12v DC. I would also like the circuit to shutdown at below 7v DC.

Any ideas if there is anything out there that can already achieve this, or is there a way I can make this?

Thanks all

Title should say regulator. Sorry. I can't ammending it on my phone.

 

What you're looking for is a "DC-DC boost converter". Plenty advertised online. Cheaper to buy than build.

 

Hello all,

I would like to make a regular that will take 7v to 9v DC and to then regulate it to 12v DC. I would also like the circuit to shutdown at below 7v DC.

Any ideas if there is anything out there that can already achieve this, or is there a way I can make this?

Thanks all

Title should say regulator. Sorry. I can't ammending it on my phone.

How much current?

 

Under 1A. I am awaiting the exact mA at the mo.

Is there a way I can use this: http://www.robotshop.com/uk/12v-step-up-voltage-regulator-u3v12f12.html with 3 x CR123A batteries but add something that when VIN drops below say 6V the circuit shuts down?

I am trying to ensure the reg will not get to hot and also to ensure that it remains above 80 percent efficiency.

Any thoughts?

Thanks guys

 

To get 1A out at 12V would need 12/9 = 1.33A input at 9v, assuming 100% efficiency. Factor in the 80% efficiency and you'd need 1.66A. That exceeds the rated 1.4A for the switching device in the linked converter .

 

Thanks for the info.

I waiting for the official figures so hopefully it is under 1A.

My gut says it will be near 600mA but I need the to tell me. Lol

 

Thanks for the info.

I waiting for the official figures so hopefully it is under 1A.

My gut says it will be near 600mA but I need the to tell me. Lol

You can use a boost regulator to get there, but if you look at the battery it is a little marginal.

 

Cheers ronv.

Any idea what I can do to shut the circuit down bellow 6v?

 

Cheers ronv.

Any idea what I can do to shut the circuit down bellow 6v?

This is the easiest one I know of.