## 摘要

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% to achieve fast transient with the recovery time of 3 μs, 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%, 95.1%, and 92.8% when <formula> <tex>${V_{{IN}} }$</tex> </formula> is 12, 24, and 48 V, respectively, for <formula> <tex>${V_{{OUT} }$</tex> </formula> = 1 V.

原文 | English |
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頁（從 - 到） | 1 |

頁數 | 1 |

期刊 | IEEE Journal of Solid-State Circuits |

DOIs | |

出版狀態 | Accepted/In press - 2022 |