dick_freebird
Advanced Member level 7
Working on an isolating GaN Driver chip design,
I'm discovering a lack of appropriate diodes for
the boostrap role. Part is supposed to do 200V
and options get slim quick, especially as NASA
now wants to derate 50% for Schottky diodes
absent beam line data. Given that I also have a
speed tasking, I think I need ultrafast (not so
desirable for the forward voltage drop) or Schottky.
But Schottky diodes I find in this voltage range are
all pretty high current, high Cj and that Cj*VIN
comes right off the top as switching loss (and high
shuttle peak current).
Something like 400V, 3A peak / <1A steady, sub-nF
Cj (not commonly one of the selection params) is
where I'm centered now.
Any faves, or familes to look at?
I'm discovering a lack of appropriate diodes for
the boostrap role. Part is supposed to do 200V
and options get slim quick, especially as NASA
now wants to derate 50% for Schottky diodes
absent beam line data. Given that I also have a
speed tasking, I think I need ultrafast (not so
desirable for the forward voltage drop) or Schottky.
But Schottky diodes I find in this voltage range are
all pretty high current, high Cj and that Cj*VIN
comes right off the top as switching loss (and high
shuttle peak current).
Something like 400V, 3A peak / <1A steady, sub-nF
Cj (not commonly one of the selection params) is
where I'm centered now.
Any faves, or familes to look at?