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LM5023: lm5023疑似进入打嗝模式,但观察ss引脚一直拉低像是没有启动

Part Number: LM5023


观察到的辅助绕组波形如图所示,一直在大于12.5和小于7.5V之间波动,疑似进入打嗝模式,但无论是测量开关管驱动,ss引脚发现都没有启动,将负载减小或将电流采样电阻减小也还是这样,想请教一下这是什么原因导致的1.jpg