Class D amp with TL494 and IR2110 but there are cross-conduction, why ? fake chip ?

expressel

New member
Hi, this is my amp which worked very well with IR2111 but it doesn't work with IR2110.
With ir2110 there is a cross conduction.

Fake chip or ir2110 is only high side driver without dead time ?

firstly i tried with a chip buyed from aliexpress.
secondly i buyed one from another place because i thinked the first one is fake.

I dont believe there are no dead time in ir2110 because ive seen schs with it.
Now i believe these two chips are fake.

DSC05837.JPG
 

expressel

New member
Im planning to run it directly from 314 volts with optocoupler/s for isolation.
That will give me:

314 Vpp == 157 Vp / 8ohm = 19,625A peak == 3.1 kW peak
== 111 Vrms / 8ohm = 14A peak == 1.5 kW rms

@ 8 ohms
 

Steven.C

New member
Unfortunatly there is no dead time control with ir2110, use something like Onsemi FAN73933 or TI UCC27210 (until 100V) with programmable dead time control. Programmable is big word, its a simple resistor.

Your set up with breadboard will not work very pretty (maybe no at all), parasitic inductance on the gate of MOS will cause MOS ringing a lot. I know there is no choice sometime of breadboarding, so make the loop (out of gate driver -> resisor -> gate of MOS -> source of MOS then gnd of gate drive as small as possible).
Bring the bus capacitor as close as possible to your halfbridge
 
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