I have reviewed both the TPS2663 datasheet as well as Application Report SLVA811A Power Multiplexing Using Load Switches and eFuses.
I want to know how the OVP Threshold is set for eFuse2. The Application Report simply states "It is important to note that the secondary eFuse OVP feature is not sacrificed due to the source follower configuration from dVdT to OVP." but it doesn't state where it gets the OVP Threshold from. With just a 100k pull down (R5), the OVP voltage is seemingly just ground and has no way to determine if VIN2 is over the desired threshold.
What if we connect OVP pin to the R3 respect to the ground and the source of the n-ch mosfet and remove the R5? The maximum voltage on the R3 under normal conditions is 1.2V. Even the supply of the auxialary supply exceeds overvoltage limit still more or less 1.2V will be seen on the R3 respect to the ground. When dVdT from the main suplly is control the mosfet, max voltage will be 4.x and it shutdown the aux suplly. voltage level of the R3 will be 4.x, right?
Are there anything wrong on my conception?
