TIDT334 September 2023 UCD3138
This reference design is an industry-first digital Hybrid Hysteretic Control (HHC) design, targeted for all the server power supply unit (PSU) applications with 12-V to 54-V output. This reference design shows the HHC control advantages with the UCD3138 device, in a 400-V to 12-V, 1-kW LLC power stage. This design achieved 8-kHz peak loop bandwidth, holding less than 500-mV peak-to-peak deviation under 0% and 100% load translation with 2.5 A/μs, and less than 800-mV peak-to-peak deviation under 0% and 150% load translation with 2.5 A/μs.