I have problem understanding how the IGBT gatedriver works

[libbresse]

IGBT gate driver

I have problem understanding how the gatedriver below works :?:

Do I set ref to the voltage I want to retain on the output ?

Input is only for turn on the gatedriver :?:

https://www.fairchildsemi.com/ds/FA/FAN3111C.pdf

 

[Prototyp_V1.0]

IGBT gate driver

My guess is that you can put this gate driver after a circuit that cannot provide enough voltage to switch the mosfet completely on.

 

[libbresse]

Re: IGBT gate driver

I understand that it is a gatedriver that can give enough voltage to the gate. The thing is that I don't understand how to connect it properly to the circuit.

Please help me with input

https://www.fairchildsemi.com/ds/FA/FAN3111C.pdf

 

[libbresse]

Re: IGBT gate driver

Ok I have get it totally wrong the ref is when the input will be triggered as high and set the output high



How do I know what the fan3111 sends out then when the output is set to high I mean what voltage vill it give on the output pin :?:

 

[Prototyp_V1.0]

Re: IGBT gate driver

How do I know what the fan3111 sends out then when the output is set to high I mean what voltage vill it give on the output pin :?:

I tried to read the file, but it doesn't answer that.

My guess is that the output voltage might have an upper limit, but I'm not sure.

What about assembling your circuit and measure the output with a scope?

 

[Guest]

Re: IGBT gate driver

Output voltage will be VDD in case when IN+ is above the 2/3 VDD (cmos input ) , and the IN- is below that level. and VDD to GND can be max 18V and is connected to pin VDD.This is valid for FAN3111C. The difference in FAN3111E is that IN+ must be above Xref in order to have output at VDD. In all other cases OUT is AT GND level.

 

[libbresse]

Re: IGBT gate driver

dragan: thank you for the input, now its clear how it works

Prototyp_V1.0: I did not have fan3111 in pspice so I could not simulate the driver