Re: Polyfet LR401
Hi,
I've had quite a bit of experience with mosfets; is this the DMOS or LDMOS? If the latter, then there's probably a parasitic bipolar transistor intrisic to the device and you may have missed the oscillation on the SA. If you have a curve tracer you can determine if this is the case by looking at it's output characteristics. I've noticed that most LDMOS devices have the PBT, it's just a matter of what degree/sensitivity and whether the external circuitry is sympathetic and enhances it.
Regards,
MoonShine