When I apply voltage to the LM3480IM3-15, the output from the regulator is turned on and off a couple of times before it stays at the wanted 15V.
Vin ( and also Vout from regulator) ramps from 0V to 15V for approx. 20ms. Vin continue to increase until it reaches 24V. Just about when the output from the regulator reach 15V it makes a number of fast on/offs, Period about 15ms. The number of on/offs varies from 2 to maybe 10 times. In some few cases it does not clip at all.
FYI, when I pull the DC plug from the power supply and inserts it rapidly, i.e. the ramp-up of the voltage to Uin on the regulator is very fast, 10's of µs, the output from the regulator does not clip. This indicates that it is not the inrush current to the load that is the problem since the inrush must be much higher in the fast ramp-up compared to the 20ms ramp so the clipping of the output must be due to another reason.
When I reduce the current limiter on the power source and making the ramp even slower than 20ms, then there is no clipping.
Can You also shortly describe the intended behavior at over current? Will it turn off the output or will it limit the voltage?