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Please help! Excessive half-bridge driver ringing

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beefalo

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Hello everyone,

I am having problems with my half-bridge driver circuit. I am using the linear technology LT1160 (https://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1142,C1114,P1133,D1303) to drive two IXYS IXFN170N10 mosfets (https://www.ixys.com/97505.pdf). My problem is exceptionally bad ringing and noise in the circuit which is causing false turn-on of the mosfets (turning on when they should be off!).

I have tried adding gate resistance, filter caps, etc., to no avail! I have the circuit wired up as shown in the linear data sheet. Has anyone ever had these problems using these kinds of drivers? Right now I am just trying to prototype my design so I have everything in a protoboard, do you think this could be part of the problem (non-ideal wiring and interconnects).

Any ideas or suggestions would be greatly helpful! Please help me out if you have any suggestions.
 

VVV

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My first thought was the layout.
Since you mention proto board, I suspect that is the culprit.
So, if you are convinced that you wired everything correctly, then try doing a proper layout. You can use perfboard, but make sure the connections to the gates are kept short. And gate resistors should indeed help.
 

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