Hi, Team
My customer is using our TPS40211-Q1 as a buck-boost controller.
His usage is: the input voltage range is 9~32V, and the output voltage is constant voltage 27V.
The customer engineer gradually reduced the input voltage from 32V to 9V, and found that when the voltage was reduced to 16V, the TPS40211-Q1 could not start (BP Pin had no output).
When the input voltage increases by 16.5V, the device can start to work normally.
May I ask what could be the cause of this failure?
Thank you for your support and look forward to your reply!