一种具有自适应谐振时序控制的5-115V效率增强同步LED驱动器

2015 IEEE Custom Integrated Circuits Conference (CICC) Pub Date : 2015-11-30 DOI:10.1109/CICC.2015.7338387

Zhidong Liu, Hoi Lee

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引用次数: 4

摘要

本文提出了一种宽输入范围(5-115V) DC-DC同步LED驱动器。所提出的LED驱动器可以自动工作在软开关模式下，以尽量减少变换器在高压条件下的开关损耗。为实现高、低侧功率场效应管在不同输入输出电压下的零电压切换，提出了一种自适应谐振时序控制方法(ARTC)。为实现高频软开关，提出了两种高速高压体二极管零电压检测器。该LED驱动器采用0.5μm 120V CMOS工艺，最多可支持25个串联的高亮度LED。在软开关模式下，LED驱动器的工作频率可达1.6MHz，峰值功率效率为94.4%。与现有技术相比，所提出的LED驱动器首次展示了ARTC的自动配置硬开关和软开关能力，从而在最宽的输入电压和输出LED数量范围内实现高功率效率和电流精度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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A 5–115V efficiency-enhanced synchronous LED driver with adaptive resonant timing control

A wide-input-range (5-115V) DC-DC based synchronous LED driver is presented in this paper. The proposed LED driver can automatically operate in the soft-switching mode to minimize the converter's switching loss in the HV condition. An adaptive resonate timing control (ARTC) is developed to generate optimal dead-time for establishing zero-voltage switching of both high- and low-side power FETs under different input and output voltages. Two high-speed HV body-diode-based zero-voltage detectors are also proposed to realize high-frequency soft switching. Implemented in a 0.5μm 120V CMOS process, the proposed LED driver can support up to 25 series-connected high-brightness LEDs. The LED driver can operate up to 1.6MHz and achieve a peak power efficiency of 94.4% in the soft-switching mode. Compared to the prior arts, the proposed LED driver is the first to demonstrate auto-configurable hard-and soft-switching capability by the ARTC to achieve high power efficiency and current accuracy over both widest ranges of the input voltage and the number of output LEDs.

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2015 IEEE Custom Integrated Circuits Conference (CICC)

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