1.外置MOS管，功率可以做的更高；                                                                                                                                                 2.带高压启动，可以降低待机功耗；                                                                                                                                                                                                                   3.带抖频（SP5876），EMI效果好；                                                                                                                                                 

4.带降频，降低待机功耗（≤0.3W）；                                                                                                                                          

5.带PFC控制，在空载和轻载时可以关闭PFC电路，降低待机功耗.