VALLEY-FILL CURRENT CORRECTION AND DIMMABLE LED DRIVE CIRCUIT

摘要

Disclosed is a valley-fill current correction and dimmable LED drive circuit. The circuit comprises a valley-fill circuit for correcting an input current after rectification, a switch circuit connected in parallel to an output terminal of the valley-fill circuit, and a feedback circuit for providing a load current feedback. By means of the present invention, the valley-fill current correction and dimmable LED drive circuit meets the Energy Star requirements for the SSL power factor, has high efficiency and can satisfy the required index of EN55015B (EMI). Controllable LED dimming is achieved through a switch controller. The LED drive circuit has such functions as over-voltage protection, hysteretic thermal shutdown protection, automatic start-up, and output short circuit protection.