Cirrus CS1601 120W数字PFC控制方案
Cirrus公司的CS1601和CS1601H是用于电子镇流器的数字PFC控制器,具有最低的PFC系统成本.控制器工作在可变频率不连续导通模式(VFDCM)和零电流开关,具有最好的THD和最小化磁性元件尺寸.主要用在LED电源/驱动器,荧光灯镇流器和HID镇流器.本文介绍了CS1601和CS1601H主要特性, 方框图, 应用电路图和120W高效PFC演示板主要特性,电路图和材料清单.
The CS1601 and CS1601H are digital power factor correction (PFC) controllers designed to deliver the lowest PFC system cost in electronic ballast applications. The controller operates in a variable frequency discontinuous conduction mode (VFDCM) with zero-current switching (ZCS) optimized to deliver best-in-class THD and minimize the size and cost of magnetic components. The CS1601 operates at switching frequencies up to 70kHz while the CS1601H operates at frequencies extending to 100kHz.
The VF-DCM control algorithm varies both duty cycle and frequency. This spreads the EMI frequency spectrum, thus reducing conducted EMI filtering requirements. In addition, the maximum switching frequency is reached at the peak of the AC input, which allows for use of a smaller, more cost-effective boost inductor.
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