25 Nov
2014
25 Nov
'14
18:39
On 11/25/2014 10:35 AM, Anton Aylward wrote:
On 11/25/2014 01:19 PM, Lew Wolfgang wrote:
The laptop will have small DC-to-DC converters and/or regulators to develop the needed voltages. With 19-VDC from the wall-wart they've got plenty of "headroom" to run their regulators. Note that there are other voltages running around in there to power the CPU, which uses something around 2.2-VDC I think. 19V to 2.2V is one hell of a drop!
Yup, that's why it's done with switching power supplies. Resistive regulators would waste a lot of power. Regards, Lew -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org