SPRUJF4 October 2024
A non-isolated UCC28881-based high-voltage buck supply provides auxiliary power, delivering up to 200 mA for 15 VDC for the TIEVM-MTR-HVINV. Figure 2-2 shows the UCC28881 high-voltage buck supply circuit.
A TPS54202 step-down converter is used to generate 5 VDC from the 15 VDC auxiliary power. A TLV74033P LDO then regulates the 5 V power rail to provide 3.3 VDC to the MCU daughterboard.