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LM5010无法启动问题

Other Parts Discussed in Thread: LM5010, LM5160A

请问大家有没有遇到过这种情况?在开关电源LM5010(用于24V转5V)输入上电之前,输出上存在一个3.3V的电压(后级接了LDO芯片和JLINK调试器,此3.3V电压由JLINK调试器提供),然后LM5010输入上电,结果LM5010输出的5V被拉到3.3V了,或者说是不是此时LM5010根本没有启动。请大家帮忙分析一下,谢谢