Hi. I am trying to put together a PNP/NPN totem pole FET gate driver since I added an isolator and theh bootstrap IC doesn't work anymore (or is more than needed).
THe problem I have is that the gate current pulse needed (that the bootstrap IC could provide) is 3A. Now looking at BJTs, beta is drops like a rock at the collector currents I need (for any BJT of "reasonable size"). THe datasheet charts don't even make up to the currents I need.
Am I missing something here? Or are the BJTs inside the boostrap IC far larger than the ones found in discrete packages? Because I kind of doubt that.
THe problem I have is that the gate current pulse needed (that the bootstrap IC could provide) is 3A. Now looking at BJTs, beta is drops like a rock at the collector currents I need (for any BJT of "reasonable size"). THe datasheet charts don't even make up to the currents I need.
Am I missing something here? Or are the BJTs inside the boostrap IC far larger than the ones found in discrete packages? Because I kind of doubt that.