The TPS54525 has power-good open drain output. The power good function is activated after soft start has finished. The power good function becomes active after 1.7 times soft-start time. When the output voltage is within -10% of the target value, internal comparators detect power good state and the power good signal becomes high. Rpg resister value ,which is connected between PG and VREG5, is required from 25kΩ to 150kΩ. If the feedback voltage goes under 15% of the target value, the power good signal becomes low.