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在使用UCC28063时,4脚(PHB)悬空或者将4脚(PHB)和15脚(VREF)连接,在其他IC外围参数都一样情况下,两种情形电源效率和THD区别很大,这是什么原因?

Other Parts Discussed in Thread: UCC28063

图一,是4脚(PHB)悬空时,输入电流波形图;

图二,是将4脚(PHB)和15脚(VREF)连接时,输入电流波形图;

现在我需要将4脚(PHB)和15脚(VREF)连接,应该怎样调整UCC28063的外围参数,才能使电源效率和THD和4脚(PHB)悬空时一样好?