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TPS2491设计完,后端负载为BOOST LED恒流源,打开灯的时候时而正常时而掉电



图中输出负载为LED boost恒流源,输出恒定功率为63W,然后我控制开灯的时候总是刚上电后第一次打开灯正常,后面再开Q1后端会出现掉电情况。请大神帮忙分析一下。