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TPS92511: efficiency calculation

Part Number: TPS92511
Other Parts Discussed in Thread: TPS92200,

Hi Experts,

The same customer came back with a new design, seeking assistance in improving the efficiency of the circuit.

I want to drive 350mA to a LED and I use the LED driver TPS92511DDA. Currently, I get an efficiency of 74% when the Vin=4V. And the LED I use is:
GR CS8PM1.23-KPKR-1. The customer is aware of the previous discussion about the effects of DCR inductance.