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LM2735x的VFB异常升高到1.4-1.5V?(重新编辑)

Other Parts Discussed in Thread: TPS40210, LM2735, TPS61500

3.7升5V1A,用来驱动一组红外led,红外led每隔200ms发射一簇信号。VFB升高到1.4xV,导致输出偏大到5.8v怎么回事?二极管为B220-13-F。

sch:

PCB:

signal:

in:

fb:

sw:

out: