1. What is MOSFET Turn ON Time?

MOSFET Turn ON Time is the total time required for a MOSFET to switch from the OFF state to the fully ON state. It is the sum of the MOSFET ON delay time and the rise time of the device.

2. How Does the Calculator Work?

The calculator uses the MOSFET Turn ON Time equation:

Where:

• \( T_{on} \) — Turn ON Time (seconds)
• \( T_{d-on} \) — MOSFET ON Delay Time (seconds)
• \( T_r \) — Rise Time (seconds)

Explanation: The MOSFET ON delay time is the initial delay during which the input capacitance charges, and the rise time is the time required for the drain current to rise from 10% to 90% of its maximum value.

3. Importance of Turn ON Time Calculation

Details: Accurate Turn ON Time calculation is crucial for designing efficient switching circuits, minimizing switching losses, and optimizing the performance of power electronic systems using MOSFETs.

4. Using the Calculator

Tips: Enter MOSFET ON delay time and rise time in seconds. Both values must be non-negative numbers. The calculator will sum these values to provide the total Turn ON Time.

5. Frequently Asked Questions (FAQ)

Q1: What factors affect MOSFET Turn ON Time?
A: Gate drive voltage, gate resistance, input capacitance, and Miller capacitance all significantly impact the Turn ON Time of a MOSFET.

Q2: How can Turn ON Time be reduced?
A: Using lower gate resistance, higher gate drive voltage, and selecting MOSFETs with lower input and Miller capacitances can help reduce Turn ON Time.

Q3: What is the typical range of MOSFET Turn ON Time?
A: Turn ON Time typically ranges from nanoseconds to microseconds, depending on the MOSFET type and circuit configuration.

Q4: Why is Turn ON Time important in switching applications?
A: Shorter Turn ON Time reduces switching losses, improves efficiency, and allows for higher switching frequencies in power converters.

Q5: How does temperature affect Turn ON Time?
A: Higher temperatures generally increase the ON resistance and may slightly affect the switching characteristics, though the impact on Turn ON Time is usually minimal.