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.
The NCP4371 resides at the secondary (isolated) side of the adapter. It includes voltage and current feedback regulation eliminating the need for a shunt regulator such as TL431.
The NCP4371 provides charging current limits down to VBUS=2.2V protecting the portable device from excessive currents in case of a soft short-circuit condition.
The NCP4371 integrates a safe-discharge circuitry to quickly and reliably discharge output capacitors in case the USB cable is unplugged or connected to a 5V only USB port.
NCP4371主要特性:
Supports Qualcomm Quick Charge™ 3.0 HVDCP Class A/B
Output Voltage Can be Configured in Discreet Steps from Class A: 3.6V up to 12V Class B: 3.6V up to 20V
Constant Voltage and Constant Current Regul...