1 Answer
The MOSFET duty cycle refers to the percentage of time a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is "on" (conducting) versus when it is "off" (non-conducting) in a switching cycle. It’s commonly used in applications like PWM (Pulse Width Modulation) where a MOSFET is used to rapidly switch on and off to control power to a load.
Duty Cycle Formula:
The duty cycle \( D \) is calculated using this formula:
\[
D = \frac{T_{\text{on}}}{T_{\text{total}}} \times 100
\]
Where:
In simpler terms:
Example:
For a PWM signal with a period of 10ms (milliseconds), if the MOSFET is on for 4ms, then the duty cycle would be:
\[
D = \frac{4}{10} \times 100 = 40\%
\]
This tells you that the MOSFET is conducting 40% of the time and non-conducting 60% of the time.
In power applications, adjusting the duty cycle allows you to control the average power delivered to a load. Higher duty cycles mean more power, and lower duty cycles mean less power.
Duty Cycle Formula:
The duty cycle \( D \) is calculated using this formula:\[
D = \frac{T_{\text{on}}}{T_{\text{total}}} \times 100
\]
Where:
- \( T_{\text{on}} \) is the time the MOSFET is on (conducting).
- \( T_{\text{total}} \) is the total period of the switching cycle (which is the sum of the time the MOSFET is on and the time it's off).
In simpler terms:
- If the MOSFET is on for half the time and off for half the time, the duty cycle would be 50%.
- If the MOSFET is on for 80% of the time and off for 20%, the duty cycle would be 80%.
Example:
For a PWM signal with a period of 10ms (milliseconds), if the MOSFET is on for 4ms, then the duty cycle would be:\[
D = \frac{4}{10} \times 100 = 40\%
\]
This tells you that the MOSFET is conducting 40% of the time and non-conducting 60% of the time.
In power applications, adjusting the duty cycle allows you to control the average power delivered to a load. Higher duty cycles mean more power, and lower duty cycles mean less power.