USB POWER SUPPLY DEVICE, ELECTRONIC EQUIPMENT USING THE SAME, AND CONTROL METHOD FOR USB POWER SUPPLY DEVICE

摘要

PROBLEM TO BE SOLVED: To suppress the drop of a bus voltage Vto be output from a receptacle 108.SOLUTION: A USB power supply device 100 supplies power to a USB power reception device 200. A bus line 106 connects the output of a power supply circuit 102 to the USB power reception device 200. A switch SW1 is disposed on the path of a bus line 106. A feedback circuit 104 performs feedback control on the power supply circuit 102 such that an output voltage Vof the power supply circuit 102 approaches a reference voltage V. A controller 110 adaptively controls the reference voltage Von the basis of the electric state of the USB power supply device 100.SELECTED DRAWING: Figure 2