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TPS92515做的LED驱,为何在空载不接LED灯时,输出电压只有输入电压的一半,很低是正常的吗?

Other Parts Discussed in Thread: TPS92515

TPS92515做的LED驱,为何在空载不接LED灯时,输出电压只有输入电压的一半,很低是正常的吗?

比如VIN输入是24VDC,输出开路时电压只有12V左右,这也太低了,是怎么回事?可以改善吗?