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K20D50: how to enable USB VBus charging to USB device?

Question asked by Hui Shao on Nov 26, 2015
Latest reply on Nov 27, 2015 by Hui_Ma



I am using MK20DX128VFM5 and trying to build up a USB CDC host board to drive the enumeration and charging of a CDC device. My custom board is receiving +12V DC from power source and I expect the charging current to be around 400mA.


Question is, how can I make VBus of K20 to output current above for charging purpose? I see from user manual there is a USB Voltage Regulator inside k20, but its output is only 120mA.


Is there a reference design available for such case?