IRAUDAMP7D with IRFB4127

[bimbla]

The IRAUDAMP7D reference design uses the 5-pin dual MOSFETs. The reference design shows scalability upto 250Wrms/8E.

I was wondering, if replacing the IRFI4020H-117P in the AMP7D-200 with one pair of IRFB4127 will enable 500Wrms/4E, 1000Wrms/2E and 1000Wrms/8E-BTL options.

If this has already been tried, are there any mods to the AMP7D-200 design, except maybe the current limit setting?

Can IRS2092 drive only one pair of IRFB4127 directly or do I need to use a gate driver?

As always, thanks in advance for your time and efforts in sharing your rich experience!!

 

[ionutzxpo]

Hi,without buffers IRS2092 cannot drive more than 2nF gate capacitance and about 35nC gate charge you can make totem pole with some SOT223 2.5A NPN+PNP emitter follower and then you cand drive one or 2 pairs of IRFB4127 at 400 Khz with no problems

 

[bimbla]

IRAUDAMP7D with one pair of IRFB4127

Thanks for your reply.
I will add buffers/ gate drivers similar to that outlined in IRAUDAMP9.

Based on the low (4 times) RdsON and almost 6 times the current capacity of IRFI4020H-117P, do you think that power levels that I have estimated can be met by using only one pair of IRFI4127?

Thanks again!!