• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

negative input with a postive output dc/dc - automotive grade with ~90% efficiency

Status
Not open for further replies.

Jeff Colwell

New Member
Anyone have ideas on how to build a dc/dc with a negative rail input, a single rail positive output with a max load of ~160mA?
 

ronsimpson

Well-Known Member
Most Helpful Member
This is a typical "boost" supply. Normally this is a +12 to +24 supply. But I changed to -12 to +12V.
upload_2018-7-29_22-3-28.png
This is not right because it is trying to make 24V from -12 to +12V. If Vin is -11V then the out put will be 13V.

Below I changed the feed back circuit. Below it is trying to make +12. If Vin is -11V then the output will be 12V.
upload_2018-7-29_22-15-30.png
 

Attachments

Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top