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LM3445芯片问题

Other Parts Discussed in Thread: LM3445

请问下,提供LED的电压是36V电流是480mA,用110V交流电供电会把LM3445芯片击穿,原理图就是数据手册给的电路图,利用DIM引脚产生PWM波控制LED的电压。开关功率fsw的值是怎么计算?LM3445可以提供 的最大功率是多少啊?