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LM3409容易烧是什么原因呀?

Other Parts Discussed in Thread: LM3409

我现在利用LM3409作为恒流源给镍氢电池充电,输入电压六十多伏,输出电压三十多伏(24节镍氢电池),充电电流1A,现在已经烧了好几块芯片了,不知道什么原因,我现在给电的时候都心惊胆战的,不知道什么时候就会烧了,片子这么小,管教附近线很细,片子一烧周围糊一大片,这块板子基本就不能用了,很愁人,