I`ve tried to separate the grd`s, but in this case the chart is not working. Even I have around +13 volts between COM and Vss. I think in this case the logic supply(15V) are not enough to open the low transistor. Is this normal or I have a mistake in my chart???
I want to ask another thing. Until my last attempt I was using 2 lambs(60W) for load in 220VDC circuit. This prevented any demages in the chart. In this case everything worked fine - my fan(the load) was working well. But when I`ve removed the lambs I`ve gotten an explosion. I have suspicions this happened because I`m using a different power supply for +5,+15 and 220V, and when I turn on the 220V the controller is working and 1 of the transistors should be open. I suppose the rush current is too big to be hold form only 1 transistor and this causes the demage. Is this correct or have a major problem???