J. Semicond. > 2008, Volume 29 > Issue 6 > 1210-1215

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An On-Chip Soft-Start Circuit for DC-DC Switching Regulators

Li Yanming, Lai Xinquan, Yuan Bing, Ye Qiang and Jia Xinzhang

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Abstract: A soft-start circuit based on DAC (digital-to-analog converter) control for DC-DC switching regulator is presented.Using the techniques of DAC control and soft-start voltage sense,the rush current and overshoot of the output voltage during start-up are eliminated effectively,allowing for a smooth output voltage ramp from zero to regulation.At the end of start-up,the biased current of the soft-start circuit is cut off completely. Consequently,it is power-efficient.The circuit is designed using CMOS devices without the need of any external components,so it is suitable for integration in DC-DC switching regulators.The proposed soft-start circuit has been applied to a Buck PWM controller successfully.The experimental results show that in the entire load range the output of the system can start up smoothly,the inductor current remains stable,the output voltage rises smoothly without overshot,and the soft-start time is about 1.2ms.

Key words: soft-startDC-DC switching regulatorrush currentovershoot

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    Received: 18 August 2015 Revised: 29 November 2007 Online: Published: 01 June 2008

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      Li Yanming, Lai Xinquan, Yuan Bing, Ye Qiang, Jia Xinzhang. An On-Chip Soft-Start Circuit for DC-DC Switching Regulators[J]. Journal of Semiconductors, 2008, In Press. Li Y M, Lai X Q, Yuan B, Ye Q, Jia X Z. An On-Chip Soft-Start Circuit for DC-DC Switching Regulators[J]. J. Semicond., 2008, 29(6): 1210.Export: BibTex EndNote
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      Li Yanming, Lai Xinquan, Yuan Bing, Ye Qiang, Jia Xinzhang. An On-Chip Soft-Start Circuit for DC-DC Switching Regulators[J]. Journal of Semiconductors, 2008, In Press.

      Li Y M, Lai X Q, Yuan B, Ye Q, Jia X Z. An On-Chip Soft-Start Circuit for DC-DC Switching Regulators[J]. J. Semicond., 2008, 29(6): 1210.
      Export: BibTex EndNote

      An On-Chip Soft-Start Circuit for DC-DC Switching Regulators

      • Received Date: 2015-08-18
      • Accepted Date: 2007-11-06
      • Revised Date: 2007-11-29
      • Published Date: 2008-06-05

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