48-to-1 V Direct Conversion Using High-Voltage Storage and Low-Voltage Boost Bootstrap Technique and Early Comparison On-Time Generator for Precise Nanosecond Pulses and 90.3% Efficiency in Automotive Applications

Si Yi Li, Bo Ruen Chen, Ke Horng Chen, Ying Hsi Lin, Shian Ru Lin, Tsung Yen Tsai

Research output: Contribution to journalArticlepeer-review

Abstract

This article presents a one-stage buck converter with an accurate nanosecond ON-time ( <formula> <tex>${T_{ON}}$</tex> </formula> ) control for 48-1-V direct conversion for automotive applications. In order to overcome the low duty cycle from 48 to 1 V, the proposed high-voltage storage and low-voltage boost (HSLB) bootstrap circuit can reduce the level shifter delay to close to zero and the bootstrap delay to less than 2 ns. In addition, the early comparison <formula> <tex>${T_{ON}}$</tex> </formula> generator can reduce the comparator delay ( <formula> <tex>$${T_{d_{ comp}}}$$</tex> </formula> ) to close to zero at steady state to achieve precise nanosecond pulse <formula> <tex>${T_{ON}}$</tex> </formula> . On the other hand, <formula> <tex>${T_{d_{ comp}}}$</tex> </formula> can be quickly extended to increase <formula> <tex>${T_{ON}}$</tex> </formula> by 540&#x0025; to achieve fast transient with the recovery time of 3 &#x03BC;s, in case load changes from 200 mA to 1 A. Based on the precise nanosecond <formula> <tex>${T_{ON}}$</tex> </formula> , the OFF-time is extended by the load-dependent current limiting OFF-time modulation for improving light-load efficiency. Experimental results show that the peak efficiency reaches 96.5&#x0025;, 95.1&#x0025;, and 92.8&#x0025; when <formula> <tex>${V_{{IN}} }$</tex> </formula> is 12, 24, and 48 V, respectively, for <formula> <tex>${V_{{OUT} }$</tex> </formula> = 1 V.

Original languageEnglish
Pages (from-to)1
Number of pages1
JournalIEEE Journal of Solid-State Circuits
DOIs
StateAccepted/In press - 2022

Keywords

  • 48-1-V direct conversion
  • Automotive applications
  • automotive applications
  • buck converter
  • Buck converters
  • Capacitors
  • Delays
  • high step-down ratio
  • low total loop delay
  • Low voltage
  • seamless transition.
  • Switches
  • Voltage

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