Tool/software:
Dear Experts, please refer to below schematic. I use TPS2121 to select the power source. The IN2 is the main power source, it has higher priority. OV1 and OV2 are connected to GND to disable the OV protect function. In order to keep IN2's priority, PR1 is connected to GND and CP2 is obtained from IN2. The 5V power is always connected to IN1. When USB plug in, CP2 is pulled to High state, TPS2121 works on VREF mode. When USB plug out, CP2 is pulled to LOW state. At this state, PR1 and CP2 are kept on LOW state. What's mode does TPS2121 work (Invalid Input mode or VCOMP mode?)? Another question, CP2's recommended operating voltage is 5.5V(max.)? Best regards.
