Mode Control Design of Dual Buck Converter Using Variable Frequency to Voltage Converter 


Vol. 42,  No. 4, pp. 864-870, Apr.  2017


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  Abstract

This paper describes a Dual Buck Converter with mode control using variable Frequency to Voltage for portable devices requiring wide load current. The inherent problems of PLL compensation and efficiency degradation in light load current that the conventional hysteretic buck converter has faced have been resolved by using the proposed Dual buck converter which include improved PFM Mode not to require compensation. The proposed mode controller can also improve the difficulty of detecting the load change of the mode controller, which is the main circuit of the conventional dual mode buck converter, and the slow mode switching speed. the proposed mode controller has mode switching time of at least 1.5us. The proposed DC-DC buck converter was implemented by using 0.18㎛ CMOS process and die size was 1.38×1.37mm. The post simulation results with inductor and capacitor including parasitic elements showed that the proposed circuit received the input of 2.7~3.3V and generated output of 1.2V with the output ripple voltage had the PFM mode of 65mV and 16mV at the fixed switching frequency of 2MHz in hysteretic mode under load currents of 1~500mA. The maximum efficiency of the proposed dual-mode buck converter is 95% at 80mA and is more than 85% efficient under load currents of 1~500mA.

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  Cite this article

[IEEE Style]

T. Lee, J. Kim, J. So, K. Yoon, "Mode Control Design of Dual Buck Converter Using Variable Frequency to Voltage Converter," The Journal of Korean Institute of Communications and Information Sciences, vol. 42, no. 4, pp. 864-870, 2017. DOI: .

[ACM Style]

Tae-Heon Lee, Jong-Gu Kim, Jin-Woo So, and Kwang-Sub Yoon. 2017. Mode Control Design of Dual Buck Converter Using Variable Frequency to Voltage Converter. The Journal of Korean Institute of Communications and Information Sciences, 42, 4, (2017), 864-870. DOI: .

[KICS Style]

Tae-Heon Lee, Jong-Gu Kim, Jin-Woo So, Kwang-Sub Yoon, "Mode Control Design of Dual Buck Converter Using Variable Frequency to Voltage Converter," The Journal of Korean Institute of Communications and Information Sciences, vol. 42, no. 4, pp. 864-870, 4. 2017.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880