A 94.7% Efficiency Direct-Step-Down Switched-Tank-Based 48V to 1V-3.3V Hybrid Converter with Constant-Resonant-Time Closed-Loop Control

Si Yuan Sim1; Xin Zhang2; Junmin Jiang3; Kang Wei4; Cheng Huang1

10.1109/APEC48139.2024.10509251

2024-02-29

1048-2334

979-8-3503-1665-0

2024 IEEE Applied Power Electronics Conference and Exposition (APEC)

25-29 Feb. 2024

Long Beach, CA, USA

This paper presents a new hybrid topology for 48V to point-of-load DC-DC converters. The proposed direct-step-down switched tank converter (DSDSTC) combines a resonant switched-tank stage and a non-resonant buck stage into a single stage with shared power switches. By adjusting the global duty-cycle between the effective stages, closed-loop regulation is achieved with a comparator-based low-complexity constant-resonant-time (CRT) control with fast transient response. A prototype has been designed using 8 GaN switches (at least 4 less than the original conceptual design presented by Google) for 48V to 1-3.3V conversion, achieving a peak efficiency of 94.7%, a maximum current of 50A and a maximum power density of 595-W/in3. Only a 40-mV droop is observed in a 1-20A load transient.

其他

EI

1.Department of Electrical and Computer Eng., Iowa State University, Ames, USA
2.IBM, IBM T.J. Watson Research Center, Yorktown Heights, USA
3.Department of Electronic and Electrical Eng., Southern University of Science and Technology, Shenzhen, China
4.Texas Instruments, Kilby Labs, Dallas, USA

Si Yuan Sim,Xin Zhang,Junmin Jiang,et al. A 94.7% Efficiency Direct-Step-Down Switched-Tank-Based 48V to 1V-3.3V Hybrid Converter with Constant-Resonant-Time Closed-Loop Control[C],2024.