Cypress CY8CLEDAC02 17W LED驱动器参考设计

Cypress 公司的CY8CLEDAC02高性能离线LED驱动器,器件采用有所有权的数控技术,能自动检测调光类型. CY8CLEDAC02 AC离线输入从80VAC到277VAC,输出功率高达25W,调光范围从2%到100%.主要用在可调光的离线LED驱动器,LED替代灯以及LED照明.本文介绍CY8CLEDAC02主要特性,方框图, 简化的应用方框图, 调光输入的LED驱动电路图以及采用CY8CLEDAC02 120VAC 17W可调光LED驱动器参考设计电路图和材料清单.

The CY8CLEDAC02 is a high performance offline LED driver, designed to interface directly with most conventional phase cut based wall dimmers. The device uses proprietary digital control technology to provide automatic detection of dimmer type(leading or trailing edge). It automatically generates dimming signals for LED loads and has the ability to dim down to 2%. It modulates LED brightness using a linear dimming scheme and switches to a PWM based dimming scheme for output current levels lower than 20% of the full load current. In PWM mode optimized dimming frequencies in the range of 900 Hz result in zero visible flicker.

At the heart of a CY8CLEDAC02 based system is the chopping circuit which provides the load necessary to enable correct wall dimmer operation. It also improves PF when there is no dimmer on the line.
..

查看全文