MOSFET does not off correctly

Discussion in 'The Projects Forum' started by faustog, Mar 12, 2012.

  1. faustog

    Thread Starter New Member

    Mar 12, 2012
    Hello all

    I need to switch a mosfet as far as 333 Khz but when I reach above 25 Khz it happens it does not switch off correctly.

    any idea about how to fix this?
  2. Ralph33000

    New Member

    Feb 28, 2012
    What are you using to drive the gate? Can it pull lots of current our of the gate to shut the thing off? You probably know that turning off a mosfet is essentially discharging the gate capacitor.
  3. praondevou

    AAC Fanatic!

    Jul 9, 2011
    As Ralph stated, you will need to turn the MOSFET off faster. Either by increasing the coutput current capability of your driver or using a MOSFET with a lower gate charge.

    Is this a simulation or a real-world application?

    What's the 39Ohm resistor for?

    What's the source impedance of your MOSFET driver/power supply?, What's the gate resistor value?