Dear sirs,
My customer designed with TPS51220A for their IPC product and had abnormal output voltage issue.
Their design is Vin=12V, Vo1=5V,4.1A, and Vo2=3.3V,2.8A!
While the power supply attached, the system is in standby mode and the Vo1 is around 4.8V and Vo2 is around 3.4V.
After system boot up(loading attached), the Vo1 will drop down to around 4.6V.
I had checked with the feedback resistor and setting is OK, but the Vfb is always around 0.96V.
Is there any points else that I can check for the issue?
Thank.
The schematics is almost same with datasheet reference as below.
