Home
Back
Formula Used:
| From: | To: |
The BJT (Bipolar Junction Transistor) Turn OFF Time is the total time required for a transistor to switch from the ON state to the OFF state. It is defined as the sum of the storage time (Ts) and the fall time (Tf) of the transistor.
The calculator uses the formula:
Where:
Explanation: The storage time is the time interval between the trailing edge of the input pulse to the 90% of the maximum value of the output. The fall time is the time taken for the collector current to reach from 90% of its maximum value to 10% of its initial value.
Details: Accurate calculation of turn OFF time is crucial for designing efficient switching circuits, optimizing transistor performance, and preventing switching losses in power electronics applications.
Tips: Enter storage time and fall time values in seconds. Both values must be positive numbers. The calculator will compute the total turn OFF time.
Q1: What factors affect the turn OFF time of a BJT?
A: The turn OFF time is influenced by the transistor's construction, doping levels, operating temperature, and the driving circuit characteristics.
Q2: Why is turn OFF time important in switching applications?
A: A shorter turn OFF time allows for higher switching frequencies, reduced switching losses, and improved efficiency in power conversion circuits.
Q3: How can turn OFF time be minimized?
A: Turn OFF time can be minimized by using faster switching transistors, optimizing base drive circuits, and using appropriate snubber networks.
Q4: What is the typical range of turn OFF times for power BJTs?
A: Turn OFF times for power BJTs typically range from nanoseconds to microseconds, depending on the transistor type and application.
Q5: How does turn OFF time affect circuit design?
A: The turn OFF time determines the maximum switching frequency of the circuit and affects the design of timing components, heat dissipation requirements, and overall system efficiency.