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UCC28070: UCC28070设计电路后进行输入电源切换(切换时间150ms),轻载状况下PFC管子会出现击穿问题

Part Number: UCC28070

使用UCC28070芯片设计4kwPFC电路,各项功能均正常工作,负载2.2A-5A时进行输入电源切换(输入电源切换时间150ms左右,如图是输入切换时电感电流,与CSB波形db07af28965f29321f61de3542a02bbd.jpg

e1c90f1e41175b5c4768930d3a4d2d7e.jpg),PFC管子会概率出现击穿,切换6次击穿1次这样。