An Automotive-Use 2MHz 100VOUT Flicker-Free FrequencyModulated GaN-Based Buck-Boost LED Driver Achieving Bootstrap Charge Balancing and 16.8dBµV Radiated EMI Noise Reduction

📋 论文概要

该论文提出了一种用于汽车顺序转向信号灯的2MHz、100V输出、无闪烁频率调制GaN基buck-boost LED驱动器。解决了在宽输入电压范围（4-60V）和输出变化下实现精确稳定LED电流调节的难题，同时满足汽车应用的热和尺寸限制。

💡 主要创新点

• 采用频率调制技术实现无闪烁LED驱动，避免人眼可见的闪烁。
• 利用GaN器件实现2MHz高频开关，减小无源元件尺寸并提高功率密度。
• 提出自举充电电路，支持宽输入输出范围下的可靠栅极驱动。

🏷 关键词

📄 原文摘要

(up to 30 LEDs in series) for sequential turn signal light. As the LEDs are turned on/off sequentially, the output voltage across the LED string (VOUT) can be below, equal to, or above the input battery voltage (VIN) which also experiences a large transient from 4 to 60V. To achieve accurate and stable LED current regulation over such a wide operation voltage range, high-voltage buck-boost converters are desperately demanded [1-4]. Although high- switching-frequency (fSW) solutions have been explored as in [4, 5], the stringent thermal and size limitations imposed by automotive applications have made it increasingly challenging to continue using silicon-FET-based converters. Gallium-Nitride (GaN) FET, which offers a 5× lower capacitance and nearly zero reverse recovery to

👥 作者与机构

Xugang Ke1, Wen Chuen Liu1, Min Kyu Song1, Jing Xue1, Chen Zheng2,

Kan Liu2, Yahui Leng2, Min Chen1 Analog Devices, Santa Clara, CA Analog Devices, Hangzhou, China 1 2 Automotive headlamp and/or taillamp tend to integrate a high number of LEDs