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TPS6286A06: TPS6286A06 低温变频问题

Part Number: TPS6286A06

demo测试过程发一个问题,请帮忙确认评估一下

测试条件:3.3转0.94V 频率默认1.2M  mode管脚上拉  输出电感240nh  输出电容1*47uf

现象:-15°C以下,1A以下负载,SW出现异常变频,频率从1.2M变为1.67M和898K(温度越低,输出电容越少,现象越明显)

请问:

(1)请帮忙解释该现象产线的原因及是否正常

(2)当前空间受限,输出电感选用尺寸和感量更大的,输出电容需要满足多少才能避免该现象