270Views7Replies

Author Options:

How to pick out a transistor? What I should look for? Answered

I need a MOSFET transistor for a flyback transformer driver. Many guys said 2n3055 and I want another. How can I compare?or can you give me a list of transistors that I can use?

Discussions

It depends on too many complex things to detail here. Start with maximum voltgage (Vds) or Vce rating, and speed. Mosfets are tricky to driver very fast, so a 3055 may be a good choice, coupled to its relatively low Vce (Sat)

can I use a 2n5020?(http://www.datasheetcatalog.org/datasheet/stmicroelectronics/9038.pdf)or a mj1000?I found this site and there are some transistors(http://www.angelfire.com/80s/sixmhz/flyback.html) or this transistor (http://www.datasheetcatalog.com/datasheets_pdf/2/N/3/7/2N3715.shtml)?

I don't know your supply voltage, I don't know your peak charging current, I don't know your driver stage....

My supply voltage is 22 and supply current is 16amps and the driver stage is 0 because I am gathering meterials. if you know a simpler driver please tell me ,I want the simplest and safest way. Thank you.

Given that Ic = 1.2 A, and Icmax is only 6A, then clearly the 5020 isn't going to work. You need a POWER transistor, and a fast switching one too. Steve

Ok, i forgot that i have a monitor pcb with all of the things on it including an new flyback transformer and lots of mosfet transistor but i dont know which to use.

If you've got that, I'd poke around and find the flyback circuit there. You'll learn a lot that way.