Backlight Power Measurement
fercerpav at gmail.com
Sat Oct 10 08:56:56 CEST 2009
Paul Fertser <fercerpav at gmail.com> writes:
> Aaron Carroll <xaaronc at gmail.com> writes:
>> To determine backlight power, I've got a DAQ sampling the
>> voltage drop across R1763 (Rsense for the PCF50663 LED
>> supply) which gives me the current, and I'm sampling LED+
>> at C1764 for the input voltage. I was hoping the product
>> of these two would yield the power consumed by the
>> backlight and Rsense.
> You've got quite puzzling and unexpected results indeed. Could you
> please provide us with the actual measurements data?
OTOH 66.6% efficiency for a boost converter doesn't sound like
something really exceptionally low. And moreover we lack the datasheet
for L1704 to be able to give proper estimates.
Be free, use free (http://www.gnu.org/philosophy/free-sw.html) software!
mailto:fercerpav at gmail.com
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