Hi Expert,
I'm looking at the UVLO function of UCC27210. In my understanding, if HS is floating when UCC27210 power up, the differential voltage between HB and HS is unknown, so it may triggers VHB UVLO, then the HO is disabled. So to avoid VHB trigger UVLO when using UCC27210 in a buck topo, firstly customer should turn on the low side MOSFET, make HS connect to GND to charge BOOT capacitor to VDD-Vdiode, then customer can turn on the high side MOSFET. Is my understanding correct? Thanks.
Regards,
Jared.