Dear Webench Specialists,
My customer is evaluating LMR36520 and encountering poor efficiency at a light load than Webench.
I would be grateful if you could advise.
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According to your webench design of LMR36520FADDAR, the effciency at load current 200mA is around 80%.(Could you please see attached file of LMR36520FADDAR using Custom Part.PDF)
The efficiency at the customer is around 70%.
The difference is 10%, quite large.
I think there is a possibility that the efficiency of webench at light load is too high.
Could you please let us know whether this efficiency data confirmed on the actual board.
If possible, could you please provide the efficiency on the actual board and Webench result.
---The efficiency in our circuit---
Input power: Vin 27.5V x Iin 46.8mA = 1.287W
Output power: Vout 5V x Iout 172mA = 0.86W
Efficiency: 0.86 ÷ 1.287 = 66.9%
Input power: Vin 19.6V x Iin 61.8mA = 1.211W
Output power: Vout 5V x Iout 171mA = 0.855W
Efficiency: 0.855 ÷ 1.211 = 70.6%
2870.LMR36520FADDAR using Custom Part.pdf
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I appreciate your great help and cooperation.
Best regards,
Shinichi
