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LM5122带载工作异常

Other Parts Discussed in Thread: LM5122

你好,我现在自己仿照LM5122 单相评估板 9-20V升压至24V 4.5A的电路在自己做的PCB上进行测试,开始时发现电压没有升压,SS脚有周期性上升沿,后来看论坛说有可能是工作在hiccup模式,于是让RES直接接地不采用hiccup模式,于是电压能够升压。但是此时发现电路无法带载运作,一带负载电压马上掉下去了,能否帮忙分析下原因么?