C2 USB Power ECR: Difference between revisions

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The power limitation on USB power is currently 4.25W on production (C2) laptops.
The power limitation on USB power is currently 5W on production (XO-1 C2) laptops.


===Increasing USB power to 5W===
===Increasing USB power to 7.5W===
To increase the maximum power draw to 7.5W, replace R281 with a 140K, 1%, SMD0402 resistor. Please note that this decreases the maximum ambient temp. rating, and increases the total power dissipation of the laptop. A laptop supplying 7.5W to the USB should always have a battery present. If this power is going to be drawn from a single USB socket, it should be from one of the two sockets nearest the power button.
To increase the maximum power draw to 5W, replace R281 (near CN6, one of the USB ports) with a 180K, 1%, SMD0402 resistor.


[[Category:hardware]]

[[Category:peripherals]]
===Increasing USB power to 7.5W===
[[Category:developers]]
To increase the maximum power draw to 7.5W, replace R281 with a 120K, 1%, SMD0402 resistor. Please note that this decreases the maximum ambient temp. rating, and increases the total power dissipation of the laptop. A laptop supplying 7.5W to the USB should always have a battery present. If this power is going to be drawn from a single USB socket, it should be from one of the two sockets nearest the power button.

Latest revision as of 02:58, 13 August 2013

The contents of this page are considered outdated and some of the information may be stale. Please use information here with caution, or update it.

The power limitation on USB power is currently 5W on production (XO-1 C2) laptops.

Increasing USB power to 7.5W

To increase the maximum power draw to 7.5W, replace R281 with a 140K, 1%, SMD0402 resistor. Please note that this decreases the maximum ambient temp. rating, and increases the total power dissipation of the laptop. A laptop supplying 7.5W to the USB should always have a battery present. If this power is going to be drawn from a single USB socket, it should be from one of the two sockets nearest the power button.