Part Number: UCC21750
Other Parts Discussed in Thread: , UCC21521
I'm designing a half-bridge driver using the UCC21750. I would like to use two of these gate drivers to drive a half-bridge module from Wolfspeed (PN CAB3R5M12DM4). I'm a little confused on a bootstrapping configuration for this driver. I would like to use a single supply to drive both the high-side and low-side FETs. The datasheet doesn't mention bootstrapping and I'm a little confused as to how it should be connected considering that there is an internal kelvin connection to the gate and source. Does this mean that the COM pin should be connected to the half-bridge center on the high-side driver? Does the fact that the OUTL line already connects to the source pin on the gate drive module perform this action for me? Is this even possible to do with the hardware that I'd like to use?
The datasheet has a configuration diagram of a similar situation, however it does not indicate how the power supplies are configured for the UCC21750:
The evaluation module for a half-bridge driver UCC21750QDWEVM-054, the gate drives are simply separated into two supplies. I'm not certain if this is because it is necessary or if the they had concerns about overstressing the power supply for a general application.
Looking at the datasheet for a similar part, UCC21521, I can see this configuration which uses a single source:
Is this what I would need to do except with the OUTH and OUTL in a differential path to the gate and the drivers separated into separate blocks? Is that possible with UCC21750?
Thank you!
