Back to the ADP3450 debug probing the power MOSFET on the ADM1270
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Back to the ADP3450 debug probing the power MOSFET on the ADM1270
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Back to the ADP3450 debug probing the power MOSFET on the ADM1270
The deep memory and fast refresh rate of the ThunderScope is a godsend for stuff like this, I can see fast transients over a long time and trigger basically as fast as the data can come in.
Top is the source of the MOSFET. The supply is configured for a 50ms soft start and has a somewhat linear ramp (probably distorted a bit by supply wire inductance) from 0 to 19V as expected.
Bottom is the drain. Flatlined.
I was expecting to see it rise a little bit, then the overcurrent protection kick in (whether false positive or true doesn't matter, there should be *some* increase) after some delay.
It's not even trying to go up. So the FET isn't turning on at all./
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