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LM3409-Q1: 经验参数选择疑问

Part Number: LM3409-Q1

1. 选择频率和什么参数有关,还是随意

2. 电感电流纹波有经验值吗

3. LED的rD如何估算

4. 效率任意设置还有经验值

5. 我看手册上有pwm和模拟两个调光的设计,主要区别是什么