How to measure correctly efficiency at high load with LT8646

by E.GR   Last Updated October 09, 2019 15:25 PM

i'm trying to measure efficiency of a LT Part LT8646 at high load with the attached schematic. LT8646 EVM

i'm using a dynamic load and a power supply to give 12V. I'm using a digital multimeter to read the input current and find the efficiency. What i'm experiencing is a drop of the output voltage when the current is greater than 3A. I know this is due to the measurement setup, is there a method to avoid this and doing a correct measurement? Thanks

Answers 1

A way to get around this would be to use a sense resistor, maybe one with 0.01Ω. The sense resistor is placed between the load and the DC to DC converter. Then connect the DMM to the leads and measure the voltage. 6A would give you 0.06V and allow you to still measure with the DMM in mV mode.

Voltage Spike
Voltage Spike
October 09, 2019 15:18 PM

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