J4 ›› 2011, Vol. 38 ›› Issue (2): 135-140.doi: 10.3969/j.issn.1001-2400.2011.02.024

• Original Articles • Previous Articles     Next Articles

Design of a high output power step down DC/DC converter with the peak current control mode

LIU Lianxi1,2;YANG Yintang1,2;ZHU Zhangming1,2
   

  1. (1. School of Microelectronic, Xidian Univ., Xi'an  710071， China;
    2. Ministry of Education Key Lab. of Wide Band-Gap Semiconductor Materials and Devices, Xidian Univ., Xi'an  710071， China)
  • Received:2010-09-07 Revised:2010-10-14 Online:2011-04-20 Published:2011-05-26
  • Contact: LIU Lianxi E-mail:lxliu@mail.xidian.edu.cn

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Abstract:

This paper presents a high output-power step-down DC/DC converter based on the CSMC 0.5μm BCD (Bipolar-CMOS-DMOS) process. This chip provides a fast transient response and eases loop stabilization by using the current mode operation with the peak-current-control and slope compensation scheme. A power MOSFET with the conduct-resistor less than 0.18Ω is integrated in the chip, and it can provide an over 3.0A continuous output current. Simulation results and measurement show that the oscillating frequency is 400kHz, that the output power is more than 10W, and that the average efficiency is up to 85% over a wide supply range from 4.7V to 24V. The die area is less than 1.6mm×1.3mm, and the chip can be widely used in various distributed power systems.

Key words: BCD process, step-down, peak current control, transient response

CLC Number: 

  • TN402

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