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http://dx.doi.org/10.5573/ieie.2015.52.6.050

Design of Hysteretic Buck Converter with A Low Output Ripple Voltage and Fixed Switching Frequency in CCM  

Jeong, Tae-Jin (Department of Electronic Engineering, Inha University)
Jo, Yong-Min (Department of Electronic Engineering, Inha University)
Lee, Tae-Heon (Department of Electronic Engineering, Inha University)
Yoon, Kwang Sub (Department of Electronic Engineering, Inha University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.52, no.6, 2015 , pp. 50-56 More about this Journal
Abstract
An efficient fast response hysteretic buck converter suitable for mobile application is propoesed. The problems of large output ripple and difficulty in using of small power inductor that conventional hysteretic converter has are improved by adding ramp generator. and the changeable switching frequency with load current is fixed by adding a delay time control circuit composed of PLL structure resulting in decrease of EMI noise. The circuits are implemented by using BCDMOS 0.35um 2-polt 4-metal process. Measurement results show that the converter operates with a switching frequency of 1.85MHz when drives 80mA load current. As the converter drives over 170mA load current, the switching frequency is fixed on 2MHz. The converter has output ripple voltage of less 20mV and more than efficiency 85% with 50~500mA laod current condition.
Keywords
Hysteretic converter; ramp generator; delay time control; switching frequency;
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