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LM27403低温下空载和带载不稳定

Other Parts Discussed in Thread: LM27403

高温和常温正常,做低温的时候空载和带载电压都不稳,标称输出1.2V,电压波动范围0-2V无规律波动。测量驱动波形好像进入了打嗝模式,我的D+和D-电流监测没有使用,悬空着。后来按照案例给的方法给电流监测端加了三极管SS8050再测试,现象一样。

没有头绪了,难道低温45度下芯片工作不正常了,请求帮助。谢谢