A Digital–Controlled Soft-Start Circuit for Negative Output DC–DC Converter

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  • Yan-Ming Li
    School of Electronic and Control Engineering, Chang’an University, Middle-section of Nan’er Huan Road, Xi’an, ShaanXi Province 710064, P. R. China
  • Xiao-Li Xi
    School of Electronic and Control Engineering, Chang’an University, Middle-section of Nan’er Huan Road, Xi’an, ShaanXi Province 710064, P. R. China
  • Hao Zhang
    School of Electronic and Control Engineering, Chang’an University, Middle-section of Nan’er Huan Road, Xi’an, ShaanXi Province 710064, P. R. China
  • Zhong-Hui Chen
    School of Electronic and Control Engineering, Chang’an University, Middle-section of Nan’er Huan Road, Xi’an, ShaanXi Province 710064, P. R. China
  • Jian Sun
    School of Electronic and Control Engineering, Chang’an University, Middle-section of Nan’er Huan Road, Xi’an, ShaanXi Province 710064, P. R. China
  • Yang Luo
    School of Electronic and Control Engineering, Chang’an University, Middle-section of Nan’er Huan Road, Xi’an, ShaanXi Province 710064, P. R. China
  • Hai-Qin Jin
    School of Electronic and Control Engineering, Chang’an University, Middle-section of Nan’er Huan Road, Xi’an, ShaanXi Province 710064, P. R. China
  • Zan Zhang
    School of Electronic and Control Engineering, Chang’an University, Middle-section of Nan’er Huan Road, Xi’an, ShaanXi Province 710064, P. R. China

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<jats:p> To suppress the inrush current and overshoot voltage generated at the start-up stage of Buck–Boost converter, a digital–controlled soft-start circuit based on digital-to-analog converter (DAC) control technology is proposed in this paper. The power consumption of the circuit is zero and the circuit is also keeps the characteristics of simple structure and high reliability. The circuit has been integrated into a Buck–Boost converter with negative voltage output by using the 0.18[Formula: see text][Formula: see text]m CDMOS high voltage process. The experimental results show that this circuit can effectively suppress the rush current, and the output voltage drops smoothly from 0 to the adjustment value, [Formula: see text][Formula: see text]V. </jats:p>

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