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TPS61185: TPS61185 Efficiency drop point

Part Number: TPS61185

Hi,

We got a question from customer about TPS61185.
Could you help us?

[Question]
Our customer checked efficiency at Vin=6 to 21V under the following schematic. So they found efficiency drop at Vin=12V.

 - What is cause of efficiency drop at Vin=12V.
 - Is there any way to change drop point?

Best Regards,
tateo