Re: high voltage bipolar idea
Nice idea , but I think you might find it difficult in practice, I can't see how you would manage to feedback the current level in the extrernal transistors to the chip for control of the PWM chopping, From the simplified diagram on the data sheets , the sense resistor is needed to give the ground for the internal bridges and the sense connection is connected to the internal bridges , Trying to superimpose a voltage from sensing on the External FETs would be a problem
Bearing in mind that the block diagrams given on data sheets are highly simplified there may be a way of doing it , but you'd need more detailes circuit info |