AssemblyLine
Member level 1
I need some help understanding how much current a MOSFET driver would need.
I saw that for example a half bridge driver can source on (external ) mosfet gate 3-4 Amps (for short duration , in order to charge the gate capacitance), although the input current through the supply pins is far less than that;
What would be the power needed by a driver which have to drive external transistors?
I now that this power is proportional to the switching frequency , the gate capacitance size, and the peak output gate current capability of the driver, but i don't have a formula for that( even an approximate one)
Let s say for example a half bridge driver powered from +15V , namely FAN7390 :4.5A source/sink
If I would design the power supply which generates the +15V needed , how much current will be needed? It will be in range of 100mA? 200mA? 500mA? (Regardless of Mosfet driven )
How about IR21363 : ~0.4A source/sink; +15V supply. What will be power requirement aproximately?
I saw that for example a half bridge driver can source on (external ) mosfet gate 3-4 Amps (for short duration , in order to charge the gate capacitance), although the input current through the supply pins is far less than that;
What would be the power needed by a driver which have to drive external transistors?
I now that this power is proportional to the switching frequency , the gate capacitance size, and the peak output gate current capability of the driver, but i don't have a formula for that( even an approximate one)
Let s say for example a half bridge driver powered from +15V , namely FAN7390 :4.5A source/sink
If I would design the power supply which generates the +15V needed , how much current will be needed? It will be in range of 100mA? 200mA? 500mA? (Regardless of Mosfet driven )
How about IR21363 : ~0.4A source/sink; +15V supply. What will be power requirement aproximately?