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LM3489: 输出5V有个回勾,在2V左右有个回勾,且后面上升至5V较慢

Part Number: LM3489


上电瞬间,输出5V有个回勾,在2V左右有个回勾,且后面上升至5V较慢,波形如附件,请问是什么原因,谢谢