Part Number: UCC21520
I use the UCC21520 to drive an IGBT which has 4.4nF input capacitance, 10 Ohm Integrated Gate resistor.
I used 7.5 to 10 ohm serial reistor to directly drive the IGBT gate. I observe that only when I use 0R (ZERO!) resistor, I get satisfying Switch- ON waveform (20nSec). The turn off waveform is also improved at 0 Ohm resistor (5nSec).
The resistor slows down switch ON time to 100nS or more. I ask whether a 0R resistor is still a correct design, without over-stressing the UCC21520.
I calculated my peak source and sink current, with resistor = 0R, and I am well below 2A, which looks fine to me.
My design:
I don't have a bootrap diode. My VDDA cap is 0.1uF , VDDB cap is 0.1uF and 1uF.
VCC is 5V, VDDA and VSSA is 16v and -9v while VDDB and VSSB is 16v and -16v, respectively.
No Rgs resistor.
Thanks for your support!