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UCC21520: Bootstrap diode on UCC21520

Part Number: UCC21520

Hello TI,

i am confused with the usage of bootstrap diode.

From the datasheet, it shows that the typical application only has the bootstrap diode connected to the VDDA side.

  • Why is there are no bootstrap diode on the VDDB side?
  • Are the values Cboot and Cvdd different? And why so? if it perform the same switching task.

In the datasheet, page 4 (Pin Configuration and Functions) only states that the decoupling capacitors are needed on VDDA and VDDB.