C2 USB Power ECR

From OLPC
Revision as of 04:27, 27 November 2007 by Wad (talk | contribs) (New page: The power limitation on USB power is currently 4.25W on production (C2) laptops. ===Increasing USB power to 5W=== To increase the maximum power draw to 5W, replace R281 with a 180K, 1%, S...)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

The power limitation on USB power is currently 4.25W on production (C2) laptops.

Increasing USB power to 5W

To increase the maximum power draw to 5W, replace R281 with a 180K, 1%, SMD0402 resistor.


Increasing USB power to 7.5W

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.

Retrieved from "http://wiki.laptop.org/mediawiki/index.php?title=C2_USB_Power_ECR&oldid=80821"