✔ Darlington Transistor Vce

Darlington Transistor Vce

- October 24, 2019

A darlington transistor is a back to back connection of two transistors that comes as a complete package with three leads base emitter and collector as equivalent to the single transistor. Collector emitter voltage vce is 60v.

Npn Silicon Planar Medium Power Darlington Transistors

Ksp13 14 Npn Epitaxial Silicon Darlington Transistor

Darlington Transistor Pair Configuration Working

This mean that a tiny amount of current from a sensor micro controller or similar can be used to drive a larger load.

Darlington transistor vce. A darlington pair behaves like a single transistor meaning it has one base collector and emitter. A darlington pair is two transistors that act as a single transistor but with a much higher current gain. High dc current gain hfe typically 1000.

For darlington transistor vcesat cannot be smaller than vbe. The effective vcesat of a darlington is the vcesat of the front transistor plus a vbe of around 07v about the same as the vcesat of the inherent npn structure in the 4 layer device and the 07v vbe of the pnp structure. A darlington transistor configuration also known as a darlington pair or super alpha circuit consist of two npn or pnp transistors connected together so that the emitter current of the first transistor tr 1 becomes the base current of the second transistor tr 2.

This is one of the disadvantages of a standard darlington. The pair of bipolar transistors provides a very high current gain as compared with single standard transistor as mentioned above. By the voltage collector emitter saturation voltage can i assume that in real world this could be minimum vce and if my pair operates in active region then vce will be greater than it vce in active region depends upon rc.

Hence the second transistor pinches its own base current down by sinking current that lowers the voltage on its collector and hence the ability of the first transistor to deliver base current. Base currentib is 120ma. A tip41 power transistor is not a darlington and its max allowed continuous current is 6a its typical vcesat at 1a is 015v.

The darlington vcesat is a bit of a grey area and i wouldnt risk it anyway. One last question for switching application darlington pair should be in saturation region. It typically creates a high current gain approximately the product of the gains of the two transistors due to the fact that their b values multiply together.

A tip120 power darlington has a max allowed continuous current of 5a but its typical vcesat at only 1a is 1v. Npn medium power darlington transistor. You cant saturate it overdrive the base to achive a very low vce.

Collector base voltage vcb is 60v. Peak load current is 8a. Try it in simulation or on a breadboard with a forced beta of 10.

Any saturated transistor including a darlington can have vcesat very close to 01 to 02v with vbe at 07v. Continuous collector current ic is 5a. Emitter base voltage vbe is 5v.

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