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LM63635-Q1: 轻重负载下模式是依据什么选择的?

Part Number: LM63635-Q1

该DCDC器件在Auto模式下,器件会随着负载的变化在PWM和PFM之间切换,请问是怎么判断负载是重载和轻载的,什么情况下是轻负载,什么情况下是重负载。为什么轻负载,要用PFM模式,重负载用PWM模式?