Backlight Power Measurement

Paul Fertser fercerpav at
Sat Oct 10 08:31:49 CEST 2009

Aaron Carroll <xaaronc at> 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?

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