Electronics > Projects, Designs, and Technical Stuff
Design of SMPS - Not sure what these spikes are being caused by.
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jmelson:
The spikes in the middle of the ramp may be real.  There are some other, taller, spikes that are very narrow.  These may not be real.
First check is to connect the probe ground to your normal ground point, and then clip the probe tip to the same point.  if you see a bunch of spikes, these are coming through the GROUND of the probe, NOT through the signal pin of the probe.  That causes current through the ground shield of the probe.  You need to improve the ground between the ground point on the scope and the ground point of the equipment under test.

Jon
Zog:

--- Quote ---The spikes in the middle of the ramp may be real.  There are some other, taller, spikes that are very narrow.  These may not be real.
First check is to connect the probe ground to your normal ground point, and then clip the probe tip to the same point.  if you see a bunch of spikes, these are coming through the GROUND of the probe, NOT through the signal pin of the probe.  That causes current through the ground shield of the probe.  You need to improve the ground between the ground point on the scope and the ground point of the equipment under test.
--- End quote ---

Thanks for that. It was pointed out before but I appreciate your input.
Zog:
This image is a little unclear.
Anyone have any idea what the main driver chip is ?



T3sl4co1l:
TL494 or similar.

Tim
Zog:
Tim,
This is the circuit I came up with after you supplied me those hand drawn sheets.
Does this look right to you in general connections terms  ?

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