Gate Driver for MOSFET


#1

Hello,

I am looking for a driver IC for these two MOSFET,
FDD7N20TMCT-ND and FQD7P20TMCT-ND. My logic is generated by CPLD which is 3.3V.

I am thinking to use MD1822K6-GCT-ND. Would these be fine for this MOSFET? Or Can you recommend any other gate driver?

Thank you, Appreciate your help!


MOSFET Driver
#2

Since the mosfets that you are looking at (FDD7N20TMCT-ND and FQD7P20TMCT-ND) have a Vgs(th) of 3.0(min) to 5.0(max) V and the Driver has an output on the MD1822K6-GCT-ND can vary from -5 to +5V they should be compatible parts.

Data sheets

md1822.pdf (227.7 KB)
FDD7N20TM
FQD7P20TM


#3

Ok thanks, and the application circuit to get -5V to+5V, is the one mentioned on page 1?

I am asking this because Timing diagram of MD1822 page.5 shows 0 to 10V output.


#4

It would be based off the example noted on page 1

As an example, the input logic levels may be 0 and 1.8V, the control logic may be powered by
+5.0 and -5.0V, and the output L and H levels may be varied anywhere over the range of -5.0 to +5.0V.

Your output High min would be Vss +2 and Max of Vdd
Your output Low min would be Vss and a Max of Vdd-4.0

These values are subject to the input values given. Absolute max is listed on the top of page 2. I believe the timing diagram would be using the 10V Vdd and 0V Vss as stated in the DC Electrical Characteristics on the bottom half of page 2.


#5

Hi Robert,

That makes sense, Thanks for explaining, So to drive those MOSFET, I would need -5V to +5V logic,

I would connect +VDD and +VH to +5V supply and VL&VSS to -5V supply, it should work then.

Thank you once again for your help!


#6

The Vgs on the Mosfets are 3-5V so anything in that range should turn them on. If you are running a 0-+5 Logic from the driver to your gate you should be fine.