Aaron Carroll wrote: > BL is the backlight, with I measured across R1763, and V at C1764. [...] > BL = 14.38 V, 28.53 mA, 410.26 mW
Is the BL voltage what you measure at LED+ relative to GND or have you already subtracted LED- ? In the former case, your result would be about 10% high with maximum backlight. > IN is measured at the battery with no other external connections, > with the current measured via a 100mohm resistor in series with (+). > The power is just the product of the quoted V/I. [...] > IN = 4.01 V, 252.89 mA, 1014.09 mW Which side is IN - battery side of the shunt resistor or Neo side ? In the former case, you'd be another 6% high. Regarding expected efficiency, the 50633 manual is silent about it, the 50606 manual has the following data: Current Conversion (mA) 3.6 V -> 1.8 V 3.6 -> 3.3 V 1 75% 92% 10 85% 95% 100 85% 96% Up conversion seems to have similar characteristics as down conversion, but the voltages given don't make sense (Vi = 5.0 V and Vp = 1.8 V. That's a down conversion !) So we should expect an overall conversion loss of not much more than 25%. - Werner _______________________________________________ hardware mailing list hardware@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/hardware
