Journal of the Korean Society of Industry Convergence (한국산업융합학회 논문집)

The Korean Society of Industry Convergence (한국산업융합학회)
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Analysis of a Buck DC-DC Converter for Smart Electronic Applications

스마트기기용 강압형 DC-DC 변환기 특성해석

  • Kang, Bo-gyeong (Dept. of Nanosciences and Engineering, Inje University) ;
  • Na, Jae-Hun (Gimhae industry promotion&bio-medical foundation) ;
  • Song, Han-Jung (Dept. of Nanosciences and Engineering, Inje University)
  • 강보경 (인제대학교 나노융합공학과) ;
  • 나재훈 (김해산업진흥의생명융합재단) ;
  • 송한정 (인제대학교 나노융합공학과)
  • Received : 2019.04.06
  • Accepted : 2019.06.03
  • Published : 2019.06.30
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Abstract

Nowadays, the IoT portable electronic devices have become more useful and diverse, so they require various supply voltage levels to operate. This paper presents a DC-DC buck converter with pulse width modulation (PWM) for portable electronic devices. The proposed step-down DC-DC converter consists of passive elements such as capacitors, inductors, and resistors and an integrated chip (IC) for signal control to reduce power consumption and improves ripple voltage with the resolution. The proposed DC-DC converter is simulated and analyzed in PSPICE circuit design platform, and implemented on the prototype PCB board with a Texas Instruments LM5165 IC. The proposed buck converter is showed 92.6% of peak efficiency including a load current range of 4-10 mA, 3.29 mV of the voltage ripple at 5 V output voltage for the supply voltage 12 V. Measured and Simulated power efficiency are made good agreement with each other.

Keywords

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Fig. 2 Basic buck converter circuit

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Fig. 3 Block diagram of the proposed buckconverter

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Fig. 4 Circuit schematic of the proposed converter

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Fig. 5 Simulation result of output voltage

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Fig. 6 Output variation according to inductor value

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Fig. 7 Output variation according to capacitor value

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Fig. 8 Implementation of the proposed DC-DC buck converter

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Fig. 9 Measured results of the DC-DC conveter with digital oscilloscope

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Fig. 10 Measurement setup for testing line-load regulation with precision power supply (Keithley 2230G) and source meter (Keithley SMU 2602A)

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Fig. 11 Measured results of the line regulation

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Fig. 12 Measured results of the load regulation

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Fig. 1 Using of DC-DC converters in various applications

Table 1. summary table of the dc-dc buck converter

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