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TPS54202S FB引脚电压不在范围内

Other Parts Discussed in Thread: TPS54202

Hi,

    在使用TPS54202芯片,24V转5V时,FB引脚电压并不在手册给的0.596V左右,而是将近0.8V了,这就导致输出电压接近6.8V,负载约30mA,这个FB管脚电压应该是内部生成的一个稳定电压才对吧,用的电阻都是1%的,请问是买到的芯片有问题吗?已经换了三片都是同样的问题。输入电容有一个100uF的电解电容,未截图进来。