SPICE analysis of RL and RC snubber circuits for synchronous buck DC-DC converters

Author

Blecic, Raul ; Gillon, Renaud ; Nauwelaers, Bart ; Baric, Adrijan

Author_Institution

Fac. of Electr. Eng. & Comput., Univ. of Zagreb, Zagreb, Croatia

fYear

2015

fDate

25-29 May 2015

Firstpage

91

Lastpage

97

Abstract

Operation of a 1.3-MHz, 12-to-1.2 V, 20-A synchronous buck converter is analyzed by SPICE simulations. Special attention is given to two resonances formed by the capacitance of FETs in the off-state and the total inductance of the input decoupling network. The resonances are the main source of the broadband electromagnetic (EM) interference. Two most common circuit level methods for reducing the EM interference, an RL snubber circuit and an RC snubber circuit, are analyzed and compared in terms of their impact on the radiation characteristics, efficiency and reliability of the analyzed synchronous buck converter.

Keywords

DC-DC power convertors; RC circuits; RLC circuits; electromagnetic interference; field effect transistors; snubbers; FET; RC snubber circuits; RL snubber circuits; SPICE analysis; circuit level methods; current 20 A; electromagnetic interference; frequency 1.3 MHz; synchronous buck DC-DC converters; voltage 12 V to 1.2 V; Field effect transistors; Inductance; Integrated circuit modeling; RLC circuits; Reliability; Resonant frequency; Snubbers; conversion efficiency; electromagnetic (EM) interference; radiated emissions; reliability; switching-mode power supply (SMPS);

fLanguage

English

Publisher

ieee

Conference_Titel

Information and Communication Technology, Electronics and Microelectronics (MIPRO), 2015 38th International Convention on

Conference_Location

Opatija

Type

conf

DOI

10.1109/MIPRO.2015.7160245

Filename

7160245