A high-frequency non-isolated ZVS synchronous buck-boost LED driver with fully-integrated dynamic dead-time controlled gate drive

摘要

This paper presents a high-efficiency and high-frequency non-isolated ZVS synchronous buck-boost LED driver for automotive lighting applications. The synchronous gate driver IC with embedded high-and low-side ZVS detection is developed to generate dynamic dead-time with minimized detection delay. This enables high-frequency low-loss ZVS operation in the non-isolated synchronous converter topology over wide ranges of the input voltage and the output LED number. The buck-boost LED driver with eGaN FETs and the gate driver IC designed in a 0.5μm HV CMOS process can support up to 20 series-connected LEDs and achieve a peak power efficiency of 94.2% at 2.5-MHz switching frequency.