Hi all,

I've just drawn a simple circuit with LM2576t Adjustable Switcher.

I'd want to get a versatile psu, 3A , from 1.3 to 15 V.

I'm in doubt about proper wiring of trimmer - see pink ovals - bourns 50 K 24 turns.

Could you check the entire board also, in order to avoid wasting money ....... ?

As usual, thanks a lot.

Jm

 

Fix your grounds on the PCB.
Make ground planes as much as possible. Consult the LM2576 data sheet for layout tips.

Remember - modern switching regulators are basically operating at RF frequencies, you need to use RF PCB design practices.

I have had NASTY troubles with boards that do not work due to poor layout.

 

Fix your grounds on the PCB.
Make ground planes as much as possible. Consult the LM2576 data sheet for layout tips.

Remember - modern switching regulators are basically operating at RF frequencies, you need to use RF PCB design practices.

I have had NASTY troubles with boards that do not work due to poor layout.

 

Hi Sensacell,

First, thanks a lot for your reply.

My last pcb with same switchers, had some trouble too

Now, it works, don't know why???????????!!!!!! But after numerous trials, soldering, desoldering, and some pcb to trash, it's fine.

But ground plane aside, is trimmer and its traces correct?

Thanks a lot and nice day.

jm