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LM3410: The LM3410 chip is burned when there is no load

Part Number: LM3410

In my design, sometimes LM3410 is connected to LED, sometimes NC.  The LM3410 works fine with LED load, but burns out without LED.  Excuse me, what is the solution?  

As shown in the figure, LED_H_P and LED_H_N are sometimes connected to LED and sometimes not.