Part Number:TPS65131-Q1
Dear expert,
I have a problem with inverting Buck-Boost converter. I tried to implement the circuit which is explained in http://www.ti.com/lit/an/slva721a/slva721a.pdf and realized that the output voltage was around -12.5V. I used the feedback resistor values as R3= 1MOhm and R4= 121.2KOhm. The output voltage generated was not -10V, it was -12.5V. What could cause this problem? Note that other values such as output capacitor, input capacitor are all used according to the values given in the example which is given above.
Best regards,
Ramazan Yaman