- #1
GlenS
- 6
- 0
Hi,
I'm new here and not sure if this is the appropriate forum for my question. I'm trying to drive a power MOSFET (2SK3746) but I'm having trouble getting it to switch 'on' consistently because my trigger is a 5V trigger from a BJT and the drain voltage is 1300V above source. To fix this I need to switch a (separate) 20V power supply to the gate of the power MOSFET using the 5V input. I know that if I try to switch the rail by adding another MOSFET in a source-follower I will get a voltage which is the drain current, id, of the switching MOSFET times the output resistance RL, which will be almost-but-not-quite my 5V input voltage.
Can anyone suggest a way I can (quickly, i.e. ns) use the 5V trigger to switch a 20V rail? Or even where I might look for such a circuit?
Thanks
I'm new here and not sure if this is the appropriate forum for my question. I'm trying to drive a power MOSFET (2SK3746) but I'm having trouble getting it to switch 'on' consistently because my trigger is a 5V trigger from a BJT and the drain voltage is 1300V above source. To fix this I need to switch a (separate) 20V power supply to the gate of the power MOSFET using the 5V input. I know that if I try to switch the rail by adding another MOSFET in a source-follower I will get a voltage which is the drain current, id, of the switching MOSFET times the output resistance RL, which will be almost-but-not-quite my 5V input voltage.
Can anyone suggest a way I can (quickly, i.e. ns) use the 5V trigger to switch a 20V rail? Or even where I might look for such a circuit?
Thanks