Kapanadze 6

Posted on Feb 4, 2014

If your scope probes are not isolated then it's still no problem because you can connect the grounding leads of your probes to point A and the tips of your probes to points B and C. Yes, the resulting current traces will be inverted, but only if you don't enable that inverting function in your scope's channel setup. BTW: The schematic diagram below represents exactly what you have built, but it also shows the internal TL494 transistors (the numbers in blue circles are the TL494 pin numbers) and this schematic is just drawn in a different manner.

Kapanadze 6
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Kapanadze 6 - image 1
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So this means any MOSFET with internal parasitic diodes are causing this, meaning use your suggested method of extra Shottky diodes/snubbers, or as an alternative; swap to transistors like in the diagram below? But then i probably will run in all sorts of other spiking problems, right? So i will go for the MOSFETs with Shottky diodes and my 17V snubber zeners. It is much better to put the 0.1Ω CSRs on drain current paths as illustrated on the attached diagram.

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