Hi
I have a design problem that I cant solve. I have a negative supply (-1000VDC) that I need to switch on and off through a TTL level PWM signal. The power MOSFET I have picked is this STW9N150.
I have been experimenting with the power mosfet I have (which is n channel mosfet) and noticed the following:
1- I have to connect the gate of the mosfet to the source (the negative supply), otherwise the mosfet will never switch.
2- when I connect the gate to ground or positive voltage, the FET turns on, the only way I found to switch the mosfet off is by leaving the gate FLOATING (not connected to anything) which is not a good practice..
How do I turn this mosfet switch off?
(the load I am driving will draw about 2A, the current will be limited by the supply).
I attached an image of the seed circuit that I need to drive.
Thanks in advance.
I have a design problem that I cant solve. I have a negative supply (-1000VDC) that I need to switch on and off through a TTL level PWM signal. The power MOSFET I have picked is this STW9N150.
I have been experimenting with the power mosfet I have (which is n channel mosfet) and noticed the following:
1- I have to connect the gate of the mosfet to the source (the negative supply), otherwise the mosfet will never switch.
2- when I connect the gate to ground or positive voltage, the FET turns on, the only way I found to switch the mosfet off is by leaving the gate FLOATING (not connected to anything) which is not a good practice..
How do I turn this mosfet switch off?
(the load I am driving will draw about 2A, the current will be limited by the supply).
I attached an image of the seed circuit that I need to drive.
Thanks in advance.
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