Inrush current limit

Question

I have a circuit that runs at 5V ~200mA. When the system in turned on I get a spike of about 2A. Repeated cycling will kill the core circuit. What are some strategies to protect my circuit? Zero

DAB · Answer

Take a look at what type of bead they use in your PC's power supply. Another good source is the old CRT monitors, they usually had a fairly large bead to keep the HF from getting back to the power supply. I am not an expert on the beads, but I have been involved in projects where we needed to cut down on the inrush currents and the engineers I worked with used the beads effectively. Hopefully this points you in the right direction. DAB

Former Member · Answer

Hi, this is the circuit I use for limiting the inrush current on USB powered circuits on +5 V rail. Changing the capacitor you can obtain a bigger delay.