C2 USB Power ECR: Difference between revisions
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(The previous page reflected an earlier data sheet on the USB power controller.) |
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===Increasing USB power to 7.5W=== |
===Increasing USB power to 7.5W=== |
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To increase the maximum power draw to 7.5W, replace R281 with a |
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. |
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Revision as of 03:25, 10 July 2008
The power limitation on USB power is currently 5W on production (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.