In order to enhance the efticiency performance, the LD5523/R/HE integrates the multi-mode PWM controller, which consists ot Quasi-Resonant (QR) PWM contral for light load condition and Continue Conduction Mode (CCM) for heavy load condition. Moreaver, the QR controller not only gains the system performance, but also brings the worse EMl capability, while the frequency swapping function of LD5523/R/H/E can reduce the EMl emission of SMPS and helps the power circuit designers to simply deal with EMl filter and saves several component and developing time.为了提高效率，LD5523/R/HE集成了多模式PWM控制器，该控制器由轻负载条件下的准谐振（QR）PWM控制和重负载条件的连续导通模式（CCM）组成。此外，QR控制器不仅提高了系统性能，还带来了较差的EMl能力，而LD5523/R/H/E的频率交换功能可以减少SMPS的EMl发射，帮助电源电路设计人员简单地处理EMl滤波器，节省了几个组件和开发时间
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