Guru
Joined: 08/10/2011
Location: AustraliaPosts: 2498
| Posted: 04:26pm 25 Mar 2017 |
I have been measuring RDS on but not others, I would be interested if you could post any info on how to do that.
I recently had a power board that I tested after adding 1 MOSFET to each of the 4 legs, while doing this I had no capacitors on the pcb. It worked perfectly with very low idle current and perfect waves right through to and including having all 24 MOSFETs on board. Then I added capacitors and the whole thing went pear shaped. Idle current went from >15W to around 250W and lots of spikes in the waveform. Only change was adding capacitors, I may be wrong but I suspect both sides of the bridge are on for a few nanoseconds. While there were no caps on the PCB it could not draw much current.
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