ST L6564H 基于L6564H宽范围高功率因数升降压电源参考设计方案
ST公司的L6564H是一款除具有L6564功能外，增加了高电压启动源功能的电流模式PFC控制器芯片，该功能使芯片更适合应用在节能稳压器设计和在主控制阶段进行PFC预稳压高调节的设计。内嵌高度线性倍增器具有一个特殊的修正电路，通过这个修正电路减少电源电流的转换失真，即使在大的负载范围，也允许一个具有极低总谐波的宽范围电源进行操作。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。
The L6564H is a current-mode PFC controller operating in transition mode (TM) which embeds the same features existing in the L6564 with the addition of a high voltage startup source. These functions make the IC especially suitable for applications that must be compliant with energy saving regulations and where the PFC preregulator works as the master stage.
The highly linear multiplier, along with a special correction circuit that reduces crossover distortion of the mains current, allows wide-range-mains operation with an extremely low THD even over a large load range.
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