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MAX16840 LED Driver Slide 8
On the output side, the LED voltage and current also have AC components. Care must be exercised to use a voltage probe and a current probe to measure the voltage and current of the LED string. The oscilloscope math function can then be used to multiply the instantaneous current and voltage values for the instantaneous power, which can be averaged for the average power. The driver efficiency is the output power divided by the input power.
PTM Published on: 2015-04-29