HAS ANYONE USED LM380, LM383, LM384, LM390, LM2002 ETC TO MAKE A RAIL SPLITTER ?
Typical VCC can go as high as 20 to 22 vdc for some of the chips.
No signal, no gain, just inputs pulled low and or tied together.
I would like to drive an Nfet or IGBT +15 or less and -15 or ''more'' (positive) for hard switching.
Rigging up an ISOLATED high side driver with DUAL SUPPLIES looks to be a pain.
Would also like to stay away from bootstrapping and have SOLID gate drive pulses.
I think I need a virtual ground on the source/emitter and After looking at several rail splitters and op amps that only sink/source 20 to a few hundred ma. I saw some discrete designs with npn and pnp totem pole (?) output.
Since these audio amps have the quiescent output at 1/2 VCC and should be able to source and sink current, I think grounding the inputs so all the output has to do is fight to keep the output at 1/2 VCC seems like it would work. Worst case is I may need to add a boost smps to boost to 22 volts or so with my virtual ground at 9 volts and 13 more volts or so to mash the gate/base on.
The fet will hopefully bucking 450 volts down to 165 volts to feed a modified sine inverter using two half bridge igbt modules as an H bridge to create a noisy dirty simulated 120VAC at hopefully a kilowatt (plus or minus 1 kilowatt). If that works I may try to simulate a true sine inverter...
Brian In santa cruz