Is there standard way to get information about BJT switching time?

Is there standard way to get information about BJT switching time?

Is there some standard way to get information about BJT (Bipolar Junction Transistor) rise and fall times (the high power ones) ? In essence a IGBT is a BJT being driven by a FET, so there should be some high-power, medium-speed BJT.

Can a BJT be driven by a FET?

In essence a IGBT is a BJT being driven by a FET, so there should be some high-power, medium-speed BJT. Sure. Not all manufacturers specify the data for all their BJTs, but there are good data sheets around, for instance the 2SA2090.

What kind of BJT is used in Multisim live?

The MJ15024 used in the circuit is a very high power BJT for the purpose of this demonstration but it is the only available model in the Free Subscription version of Multisim Live. In the circuit, the ON collector current was set to just 0.5 A and the base current is about 25 mA to get a clean reference waveforms.

Which is the biggest delay in a BJT?

The biggest overall delay is storage time. When a BJT is in saturation, the base region is flooded with charge carriers. When the input goes low, it takes a long time for these charge carriers to leave the region and allow the depletion layer to begin to form.

When does the BJT come out of saturation?

Storage time (ts) is the time required for the BJT to come out of saturation. This is the time required for the VC to reach 10% of its high-state value (Vcc)

How does a faster BJT help a computer?

A faster BJT will probably help once you get the fundamentals sorted out. There are two (probably) new miracle working friends that you should meet. Speedup capacitor. (Anode to base, Cathode to collector), so that the diode is reverse biased when the transistor is off.

How is transistor rise time related to VBE?

It would be nice if there was a mathematical way to relate the transistor rise time, fall time, t-on time with Vbe and the frequency of the switching signal. For predictable switching speeds, you must quickly inject currents into the base to turn on, and quickly remove current from the base to turn off. Use speedup caps across the base resistor.

Why does the rise time of a transistor decrease?

As you can see, the collector current decreases a lot by increasing the frequency. My guess: by increasing the frequency, the period of Ib get smaller and smaller. Eventually the rise time of the transistor may be longer than the dutycycle, hence there will not be a t o n time. This is what triggered my original question.

Which is more expensive Discrete MOSFETs or BJTs?

Discrete MOSFETs are perhaps ten or twenty percent more expensive than BJTs, but they do not need base resistors which cost and occupy expensive board area.

Are there two types of bipolar junction transistors?

There is a terminal common to the input and output signals, and a signal on one of the remaining terminals controls the current in the other. There are two basic types of transistor – bipolar junction transistors and field-effect transistors, known respectively as BJTs and FETs.