对于ISL6745EVAL2Z离线高亮度白光LED驱动和高功率因数普遍的输入

ISL6745是成本低、双端控制器。主要应用于全桥和半桥型拓扑结构的电源和线调节的总线变换器。器件的主要特点是精确的开关频率控制、可调软启动、和过流关断保护。另外， ISL6745可精确地调整MOSFET不交迭的死区時間低至35ns，允許电源设计师优化开环总线变换器的效率。ISL6745 还包括电压控制输入适合于闭环PWM控制和线压前馈控制。

ISL6745的低启动和运作电流特点，使其在AC-DC和DC-DC应用容易地偏压。

这先进的BiCMOS设计特点是可调开关频率高至1MHz，1A FET驱动器，和非常低的传输延迟适合于过流快反应。
ISL6745EVAL2Z Offline High Brightness White LED

Driver With High Power Factor for Universal Input
Application Note June 9, 2009 AN1411.3



Introduction
The ISL6745UEVAL2Z utilizes Intersil’s double-ended
voltage mode PWM controller for a SEPIC converter
application requiring a constant output current. It consists of
separate assemblies for the driver and for the LED board,
which supports as many as 21 high brightness LEDs. The
LED driver board converts a universal (85V to 275VAC) AC
input to a DC output rated at 300mA. The design can be
further optimize