I put a big capacitor (100 uF) on the input to my Nixie watch's power
converter, and it doesn't have that issue. A large input capacitor is
recommended in the data sheet for every DC-DC converter chip I have ever
used.
On 5/19/16 10:32 PM, gregebert wrote:
Oh yeah, test-lead inductance. 3 feet of Pomona test leads for Vcc and
GND (6 feet round trip). The board I was debugging is a nixie
wristwatch, and it has a small DC-DC converter that takes the 3.7 to
4.2V supply (typically a Li-ion battery) down to 3.25V to run the
onboard FPGA and display drivers. Even though it's low current, say
100mA max, the DC-DC converter runs at 2-3Mhz, and has very sharp
current spikes. I couldn't figure out why the converter would start,
then shut down a few hundred usec later. There was all sorts of ringing
on the power supply, and I had assumed it was bad probe-grounding,
because I could alter it with ground clip location.
--
David Forbes, Tucson AZ
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