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LM3409HV的问题



我选用的灯是80W 10串8并,单个LED的参数图在附件里,输入时48V、2.1A的100W恒压电源,按照PDF中的48V输入35V输出设计,EN拐角直接接VIN,把RSNS改为0.15欧姆,接通电源测试测得开关频率和输出电流电压如图(在附件里),是断续的,当我改小RSNS时到0.1欧姆时,此时led变量mosfet发热严重,通电时间长会冒烟,像是电感饱和,我的电感式选择的方案中给的TDK电感15uH。请指点
LM3409HV问题附近.zip