USB Type-C规范允许通过VBUS和接地信号,从DFP 到UFP最多可以传递15W电能。当使用 “纯Type-C”解决方案时,只能使用5V电压传送这15W电能。如果 您为“纯Type-C”系统增加了USB PD规范,您就创建了一个“Type-C PD”系统,可将VBUS电压提至5V以上,最高提至20V,并将VBUS电流最大升至5A。在“纯Type-C”系统中,由DFP和UFP分别供电的Rp和Rd电阻器构成的分压器决定了VBUS电源的电流上限。UFP必须检测这个Rp/Rd 电压分压器电压,并用它来决定从VBUS电源获得的最大电流。这个Rp/Rd 电压分压器电压不是静态的;随着充电生态系统的环境变量不断改变,DFP可以动态改变其电流上限。UFP必须始终监测这个电压,并遵守DFP指示的新的VBUS电流上限。
IC693MDL760
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