Greetings.

Have a few of these; would like to use one in an adjustable power supply. What circuit should be built to drive its gate properly ?



Or, to use it as a 'pass transistor' after a LM317.
----> The maximum voltage range near to 80 Volts, current of 30 Amperes would be enough. How to do it ? A simple voltage divider feeding the gate ?

 

Here's the Spec-Sheet ...........

 

Greetings.

Have a few of these; would like to use one in an adjustable power supply. What circuit should be built to drive its gate properly ?

View attachment 331973

Or, to use it as a 'pass transistor' after a LM317.
----> The maximum voltage range near to 80 Volts, current of 30 Amperes would be enough. How to do it ? A simple voltage divider feeding the gate ?

A simple voltage divider won't do the job. Like a MOSFET you want to rapidly move charge on to and off of the gate. You need a gate drive for maximum effect. You could also consider an NPN-PNP push-pull driver. It kind of depends on what kind of a supply topology you have in mind.

 

Do you want a linear or a switching supply?

 

Linear supply.

 

An IGBT has a much higher Gate-Threshold-Voltage than a standard BJT-Transistor.
This means that it won't work very well with the standard "Current-Booster" Circuits
normally used with something like a LM317 Regulator.

I would suggest that You use the exact Circuit and Components specified in the LM317 Spec-Sheet.
With a very large Heat-Sink.

I can supply You with a Part-number and Schematic of a Chip that is a
Linear-Regulator designed to drive a big-fat-N-Channel-MOSFET.
It also has built-in Current-Limiting.
.
.
.

 

The maximum voltage range near to 80 Volts, current of 30 Amperes would be enough.

Learn to walk before you run. This is not a simple project.

 

Do You actually "NEED" ~80-Volts ?
You're talking about ~2,400 Watts !!!!
.
.
.

 

Do You actually "NEED" ~80-Volts ?
You're talking about ~2,400 Watts !!!!
.
.
.

At those power levels a linear supply seems like a dubious proposition.

 

That IGBT and possibly all IGBTs, are more suitable for switching type applications. A BJT would certainly be simpler to use in a linear application.

 

Do You actually "NEED" ~80-Volts ?
You're talking about ~2,400 Watts !!!!

Hi. What I need depends on the thing am testing/using. Sometimes can be near 70V at a couple of Amperes, some times can be a few Volts at 20+ Amperes. That IGBT should be capable of both well over 300 Watts; may be used for minutes not hours. The power transformer windings are selectable for the chosen use.

 

Here's the Spec-Sheet ...........

Reading and understanding the spec sheets it is obvious to me that this transistor is intended for SWITCHING APPLICATIONS. That means ON/OFF switching, not linear applications.
BOB has it right in post #10. Here are some details:
One chart shows that the maximum non-switching current could be possibly up to ten amps. Under very specific conditions. maybe.
So this transistor could be OK in a switched mode power supply., but not at all in a linear regulator circuit. The problem in a switching regulator would be the very large gate capacitance, which will require a monster gate driver system. so really this one will be a VERY POOR CHOICE for use in a linear pass transistor regulator system.