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LMZ31503: LMZ31503和LMZ31506 INH/UVLO引脚默认状态?

Part Number: LMZ31503
Other Parts Discussed in Thread: LMZ31506,

您好,LMZ31503和LMZ31506 INH/UVLO引脚默认状态,是开启的,还是必须需要一个高电平给他开启呢?然后我的AC701开发板,有一个LMZ31503上电发出吱吱的声音(比较微弱,需要贴近听到),输出是这样的(默认输出1.8V),电路检查也是正确的,和其他板子对比过,是不是可能芯片坏了或者没有焊接好。谢谢您的解答