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TPS61165发热问题

Other Parts Discussed in Thread: TPS61165, TPS61500

近期用TPS61165做了个恒流驱动,驱动LCD屏24V/0.2A输出,测试时发现工作一切正常,但TPS61165非常热,已经达到人手不能直接触摸的温度,非常担心长期使用折损芯片寿命,请问是什么问题导致?结构限制没有办法加散热片,若增大铺地面积会解决吗?原理图鉴附件,因做屏的背光使用,每日工作至少8小时。