How to understand the inverted state of the triode? Does anyone have an application in this area? Please explain, thank you!
Sammie 发表于 November 10, 2020
It is a triode anti-reverse connection, very common, this is to use the triode as a diode.
Leopold 发表于 November 10, 2020
It seems wrong, the simulation result is not a diode.
Orson 发表于 November 10, 2020
In textbooks, the triode structure is often described as a PNP or NPN three-layer structure. It seems to be symmetrical, C pole and E pole can be used interchangeably.
but!
Today's transistors usually use diffusion technology, so:
The E pole is usually highly doped and thin, so the diode structure formed between the E pole and the B pole is similar to a Zener tube, and the reverse breakdown voltage is only about 7V.
The C pole is usually low doped and thick, so the diode formed between the C pole and the B pole is close to a normal diode, and the reverse breakdown voltage can be 100V or more.
Then!
After reverse connection, it is still a triode, but the current magnification of this triode is greatly reduced, maybe only 10 times.
And the breakdown voltage BVceo of this triode will drop to about 7V.
Debbie 发表于 November 10, 2020
Is anti-reverse connection to protect the power supply?
Aline 发表于 November 10, 2020
The reverse connection is generally used as a diode.
