Tantalum Capacitors

[Jon Elson]

John Larkin wrote:

Al polys can make voltage regulators oscillate. Tantalums have a nice
middle-of-the-road ESR that makes 7800s happy.

My favorite cheap "MDO" regulator, the LM1117, loves a 10 uF tantalum
on its output.

I've had excellent results using two 22uF aluminum electrolytics, one on the
input, one on the output, of ZLDO1117 regulators. I've built several
hundred devices with that setup, to produce 1.2 to 3.3 V supplies for FPGAs.

Jon

 

[Jon Elson]

rickman wrote:

Is it about clearing damage or just to show the added resistance
prevented the failure? I found the story a bit hard to follow.

I believe he set up the production line to ramp up the supply voltage with
current limiting on EVERY board as it comes out of the reflow oven.

Jon