But yes the VGS threshold is possibly the culprit. You could post the LTSpice sim so I can take a look. Quote from: SiliconWizard on July 29, 2019, 01:41:59 pm Not sure. There is a Spice model, integrating it in LTSpice shouldn't be difficult. It has a relatively high RDSon so expect the starting time to be longer (well OTOH without a charge pump, it will be faster, so.), but it can be driven without a problem. The BSP125 came up: It looks like a nice fit for this kind of high voltage but low output current applications. There was a similar thread but for powering Geiger tubes. But then yes you need an appropriate MOSFET with a relatively low threshold. (And many MOSFETs in general.) Also do not connect the DRV pin (which powers the MOSFET driver) to the output voltage: it would destroy the LT1619 (and most likely the transistor as well, whichever dies first). Many of the high-voltage MOSFETs that have a model in LTSpice have relatively high thresholds so I wouldn't be surprised.
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