ROMJIST Volume 23, No. 2, 2020, pp. 188-203
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 rectifierRead full text (pdf)