On Semi NCP4371高通快速充电3．0协议参考设计
On Semi公司的NCP4371是次级端充电控制器,支持高通快速充电3.0HVDCP ClassA/B协议,支持充电器USB总线电压根据手机或便携式设备的需求而变化,输出电压从Class A的3.6V到12V,Class B的3.6V到24V,主要用在智能手机,平板电脑和手持设备的快速充电AC/DC适配器.本文介绍了NCP4371主要特性和优势,应用电路,以及15W HVDCP高通快速充电3.0协议参考设计主要特性,指标,电路图,材料清单和PCB设计图.
NCP4371 is a USB secondary side fast-charging controller, supporting Qualcomm Quick Charge™ 3.0 (QC 3.0) High Voltage Dedicated Charging Port (HVDCP) Class A and Class B specification. NCP4371 allows for selection of the output voltage of an AC-DC USB adapter based on commands from the Portable Device (PD) being powered. Selecting a higher charging voltage will reduce the charging current for a given power level resulting in reduced IR drops and increased system efficiency. Another advantage of QC3.0 is a decreased battery charging time and a reduced PD system cost thanks to the ability to select an optimum charging voltage. This eliminates the need for costly DC-DC converters within the PD. The USB-bus voltage can be controlled in discreet steps from 3.6V up to 20V. The output current is limited not to exceed maximum allowable power level.
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