What is the voltage and current of the computer's USB power supply?

- Jan 06, 2018 -

What is the voltage and current of the computer's USB power supply?


The power supply of computer USB is +5V DC, and the specification of USB1.1 is USB port, which can supply 5V + 5% voltage to external devices, while USB2.0's standard swing is smaller, and output current reaches 500mA.

USB2.0 can meet all kinds of industrial and civil needs. The output voltage and current of USB interface are: +5V 500mA, in fact, there is error, and the maximum can not exceed +/-0.2V, that is 4.8-5.2V.

USB power supply voltage: +5V is a standard value, allowing a certain deviation. The power supply voltage of the computer USB port is in accordance with the specification of the USB protocol between 4.75~5.25V

USB power supply current: the maximum value of the USB protocol is 500mA (current uncertainty), that is, the maximum output power of a single USB port is 2.5W


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