Calculate Mosfet Switching Frequency

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salman213
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How can I calculate how fast I can switch the mosfet? I have the 8 kohm pull up so I think that impacts my charging discharging time? But how do I go abotu calculating it.
 
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  • Circuit schematic of an optocoupler-driven MOSFET stage: 5 V source feeds a 2500 Ω resistor and LED of 4N26 optocoupler U1, its phototransistor drives Probe1 node pulled up through 8 kΩ R3 to a 12 V source, which gates STF13N95K3 MOSFET Q4 with 100 Ω gate resistor R6 fed from an 800 V source.
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