The 2110 is not that flash at driving high freq's with lo-Z, even a BC337 / BC327 totem pole emitter follower pair on each output would improve things a lot (put schottky's across each C-E) and it will isolate the 2110 for VHF effects which is always useful, don't forget to add 470nF MLCC and 10uF electro across each buffer for supply de-coupling... a 3.3ohm res from the emitters to the fet gate should be a good starting point...But I don't get why you say that i do not use any bufffer... the IR2110 is a gate drive IC. Should I add something ?
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