Low-ripple hysteretic-controlled monolithic buck converter with adapted switching frequency for large step-down ratio applications

Author

Wang, Se-Won ; Woo, Young-Jin ; Yuk, Young-Sub ; Lee, Byunghun ; Cho, Gyu-Ha ; Cho, Gyu-Hyeong

Author_Institution

Dept. of Electr. Eng., KAIST, Daejeon, South Korea

fYear

2011

fDate

6-11 March 2011

Firstpage

1512

Lastpage

1515

Abstract

20V maximum input voltage and 1A load current hysteretic control based monolithic buck converter with phase locked loop (PLL) is presented. To achieve advantage of hysteretic control and reduce inductor current ripple with ceramic output capacitor, hysteretic based control with PLL is adopted. Furthermore, in order to decrease inductor current ripple due to wide input voltage range, switching frequency is adapted to the input supply voltage. This buck converter is fabricated with 0.35 μm high voltage BiCMOS-DMOS (BCD) process.

Keywords

BiCMOS integrated circuits; capacitors; load regulation; phase locked loops; switching convertors; BCD process; BiCMOS-DMOS process; PLL; adapted switching frequency; ceramic output capacitor; current 1 A; inductor current ripple; load current hysteretic control; low-ripple hysteretic-controlled monolithic buck converter; phase locked loop; size 0.35 mum; step-down ratio application; switching frequency; voltage 20 V; Capacitors; Ceramics; Frequency conversion; Inductors; Phase locked loops; Switching frequency; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE

Conference_Location

Fort Worth, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-8084-5

Type

conf

DOI

10.1109/APEC.2011.5744793

Filename

5744793