PFS7329H 功率因素低

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你好,在用PFS7329H设计300W电源的PFC电路时发现功率因数低,在150W(50%负载)时,AC220V输入,功率因数是67%,满载(300W)时AC220V输入,功率因数是90.2%,是什么原因?(The  issue is during full load, the PF is 67% and 300W load PF is 90.2% ,AC220V input .too low! why?)