<![CDATA[Back to the ADP3450 debug probing the power MOSFET on the ADM1270]]>Back to the ADP3450 debug probing the power MOSFET on the ADM1270

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]]>https://board.circlewithadot.net/topic/00241802-424a-48e6-96f8-88b064d4be80/back-to-the-adp3450-debug-probing-the-power-mosfet-on-the-adm1270RSS for NodeFri, 15 May 2026 06:46:16 GMTTue, 12 May 2026 05:06:10 GMT60<![CDATA[Reply to Back to the ADP3450 debug probing the power MOSFET on the ADM1270 on Tue, 12 May 2026 05:13:16 GMT]]>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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]]>https://board.circlewithadot.net/post/https://ioc.exchange/users/azonenberg/statuses/116559891408000640https://board.circlewithadot.net/post/https://ioc.exchange/users/azonenberg/statuses/116559891408000640Tue, 12 May 2026 05:13:16 GMT