Low-voltage DC-DC converter 16-75 VDC in; 12VDC @ 3A out

| | Comments (0) | TrackBacks (0)

Here are some pics of the low-voltage converter that I created using the National Semiconductor LM2576HVT-12-ND buck-converter. The chip pretty much did everything for me -- all I had to do was to add two power-smoothing caps, a blocking diode, and a RF choke (which I mistaking undersized; promptly blew up and which I jerry rigged a loop of wire).

In the top left of the photo above, you will also note my premade, off the shelf 12VDC to 5VDC converter. This powers my LED headlights.

The following photo is the back side. Please note that I am a really lousy solderer. The LM2576HVT-12-ND will take any input from 16-75VDC and output a steady 12VDC @ 3A continuous but they mention that with active cooling it could do 5A continuous. That's 36-60 watts, plenty for me.

This is the wiring schematic that I used:

Top side again. The setup is small enough that my ESC and UBEC still fit in the project case with plenty of space for airflow -- and for another DC-DC converter to fit in there in case 3~5A is not enough.

The resulting low-voltage converter and ESC "mounted" on my bike with duct tape. This is an older photo, I've reduced some of the wiring and since changed the SB50 connector to a PowerPole 45.

0 TrackBacks

Listed below are links to blogs that reference this entry: Low-voltage DC-DC converter 16-75 VDC in; 12VDC @ 3A out.

TrackBack URL for this entry: http://www.photoethnography.com/cgi-bin/mt/mt-tb.cgi/734

Leave a comment

About this Entry

This page contains a single entry by Karen Nakamura published on August 8, 2008 6:40 AM.

Sunday Boxer was the previous entry in this blog.

Very very very short test run video is the next entry in this blog.

Find recent content on the main index or look in the archives to find all content.