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限流开关TPS2552D效率

Other Parts Discussed in Thread: TPS2552D

各位大侠好!

TPS2552D限流开关有几个疑问想确认下,

我有一个5v的电源输出给一个usb口,这时候输出电流是500mA(因为usb口默认电流是500mA),如果在5v电源和usb口之间加一个限流开关TPS2552D的话,并且将输出电流设置为250mA之后,请问这时候限流开关输出到usb口的电流是限制在250mA吗  那5v电源给限流开关TPS2552D输入的电流也会相应减小吧?  限流开关不会自己消耗那250mA吧?

谢谢