Romanian Journal of Information Science and Technology (ROMJIST)

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ROMJIST is a publication of Romanian Academy,
Section for Information Science and Technology

Editor – in – Chief:
Academician Dan Dascalu

Secretariate (office):
Adriana Neagu
Adress for correspondence: romjist@nano-link.net (after 1st of January, 2019)

Editing of the printed version: Mihaela Marian (Publishing House of the Romanian Academy, Bucharest)

Technical editor
of the on-line version:
Lucian Milea (University POLITEHNICA of Bucharest)

Sponsors:
• National Institute for R & D
in Microtechnologies
(IMT Bucharest), www.imt.ro
• Association for Generic
and Industrial Technologies (ASTEGI), www.astegi.ro

ROMJIST Volume 23, No. 2, 2020, pp. 188-203, Paper no. 647/2020
 

Cosmin Alexandru IORDACHE, Mircea BODEA
Analysis and design of a high efficiency current mode buck converter with I2C controlled output voltage

ABSTRACT: This paper presents the analysis and design of a two-version current mode buck converter whose output voltage is set by a digital potentiometer programmed through an inter-integrated-circuit interface (I2C). The first version of this converter is an asynchronous rectifier variant (arv) while the second version uses synchronous rectification (srv). First version can handle up to 300W output power, having an input voltage of 48V and the output voltage ranging from 1.5V up to 40V with a maximum output current of 7.5A while the second version can handle up to 360W with a maximum output current of 15A. This converter uses a high voltage, high efficiency, fixed frequency controller with programmable soft start, undervoltage lockout, current limit unaffected by duty cycle and internal high voltage regulator for its gate driver. This current mode control (CMC) buck converter was designed to be integrated in a computer-controlled unit for electronic devices characterization (CCUEDC) [4] as an upgrade of the internal hysteretic buck converter. It can be also integrated in a highly efficient and versatile lab power supply or to be used to power LEDs devices.

KEYWORDS: Microelectronics, dc-dc converter; I2C; buck; current mode; wide output voltage; high efficiency; synchronous rectifier

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