关键词: LED驱动, 临界导通, 过零检测, 栅极驱动, 栅极过零检测

Abstract: The principle of zero-crossing detect in the boundary conduction mode (BCM) in light emitting diode (LED) drive circuit is introduced. Aiming at the shortcoming of the traditional method using source-driven, a zero-crossing detection method based on power MOS gate is proposed. Based on the function of zero-crossing detection, the new method can optimize the circuit structure, reduce the chip area, and improve the competitiveness of the circuit.

Key words: LED driver, boundary conduction, zero-crossing detect, gate-driven, gate zero-crossing detect