J
Jim Drew
- Jan 1, 1970
- 0
I have a question about driving the gate on standard MOSFETS. I am very
familiar with building h-bridge controllers using the typical 4 MOSFET
h-bridge configuration, but my source voltage has always been a maximum
of 12 volts. So, tieing the gate through a resistor to the positive
rail for the P-channel fets (and driving them low with another
transistor to enable the them) has always worked just fine. Now, I have
an application where the voltage is an unknown between 7.4v and 65.0v.
I know that the VGS max on most devices is +/-20v, so anything higher
than this is going to kill the MOSFET. Does anyone have any idea on
what should be used to drive the gate that will work within that voltage
range? I am not aware of any gate drivers that will work that high. I
was considering something as simple as zener diode/resistor voltage
regulation to get the voltage to a usable level. For that matter, does
the gate voltage really need to be any higher than about 10v?
Thanks for any insight!
familiar with building h-bridge controllers using the typical 4 MOSFET
h-bridge configuration, but my source voltage has always been a maximum
of 12 volts. So, tieing the gate through a resistor to the positive
rail for the P-channel fets (and driving them low with another
transistor to enable the them) has always worked just fine. Now, I have
an application where the voltage is an unknown between 7.4v and 65.0v.
I know that the VGS max on most devices is +/-20v, so anything higher
than this is going to kill the MOSFET. Does anyone have any idea on
what should be used to drive the gate that will work within that voltage
range? I am not aware of any gate drivers that will work that high. I
was considering something as simple as zener diode/resistor voltage
regulation to get the voltage to a usable level. For that matter, does
the gate voltage really need to be any higher than about 10v?
Thanks for any insight!