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Clients have to accept 4.75 to 5.25V and must be able to send configuration data as low as 4.4V. Hubs are allowed to drop as much as 0.35V.
By itself, a USB plug does not have to supply more than 100mA; however up to 500mA can be negotiated between device and host. Some USB hosts simply offer up 500mA from the get-go.
USB power supplies short the two data lines (white and green) which allows the device to probe for the fact that they're power supplies (i.e. that they provide the full 500mA without negotiation and that they won't respond to data).
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∙ 13y ago
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What is usb bus power?
The Voltage at which the USB Drive works at.
USB 2.0 is how many times faster than USB 1.1?
usb 2.0 is about 40 times faster than usb 1.1
How much voltage can a USB port on a PC typically supply?
5v
At what voltage does a USB host supply power to the USB bus?
Pin 1 is 5 volts DC Pin 4 is ground.
What provides greater power to the Bus Firewire or USB?
FireWire generally supplies more voltage, at a maximum of 30 volts. USB provides a maximum of 5 volts.
What supplies the voltage to the USB?
The two outside contacts (of four contacts) are connected to the power supply in the computer.
Is there any way to control the voltage output on usb?
The output voltage available at a USB port is controlled by the regulator in the computers power supply. It is fixed, you can not change or control it. The maximum current which should be drawn from a USB2 port is 500mA, from a USB3 port it can (I believe) be up to 850mA.
If you connected a battery to a usb cord with some wire and connected that to another device would it charge?
depends on the voltage of the battery being used. USB voltage is 5 volts DC. If you use a car battery, which is generally 12 volts, I would think your device would not like this. But to answer your question. Yes, it will charge. But not properly if you do not use the correct voltage.
What voltage does my laptop usb provide to charge your phone?
Most USBs on laptops are 5v +/- 10%. You should not worry about charging your phone through the USB. As a matter of fact, in most cases if a phone is getting an incorrect voltage or too many amps, it will display a warning and just stop the charging.
What is the relationship between output voltage and duty cycle in a step down chopper?
If you have a cigar lighter to USB power converter used in your automobile to charge from a USB bus that fits in your car cigar lighter, the USB voltage is 5V. The car is 12V. So there is a switch to turn it on for 5 ticks and off for 7 ticks 42% duty cycle if you wanted 1.2V 10% duty cycle
What is the usb voltage output?
5 V +/- 0.25V (i.e. between 4.75 and 5.25 V)
Can a usb microphone be adapted to a 3.5 line in microphone?
Not without slicing open the microphone itself and doing some soldering. A USB microphone talks to the computer via a digital USB port, whereas a microphone designed to connect to a 3.5mm jack will produce an analog voltage.
