Itsu
Your posted pics of the sim and the .asc file are not quite in agreement. One shows 3V for the FET, the other 5V.
I was not getting your waveforms, but changing the drive to agree with your posted picture (5V) solved that.
I would recommend you use 10V to drive the IRF530 as the gate threshold voltage of 2 to 4 volts only guarantees 250 uA drain current.
With 5 volts on the gate, you can't guarantee the FET is full on. ( ok in the sim but could be marginal on the bench) This would be especially problematic if the FG drive were not to the source but the other side of CSR2, which would degenerate the FET reducing the drive signal. Good that you are floating the FG and driving the FET directly, however be aware this also has it's own set of minor problems. (capacitance of the FG internal power supply to earth ground and noise that it may generate if it has a switchmode supply)
10 volts however will insure the FET is fully on and is the typical value used to specify full drain current on the data sheets.
Other thing is the run time is specified differently in the .asc file, but that is also easily changed by the user to 20m.
Regards
« Last Edit: 2019-01-17, 23:19:01 by ion »
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