Hot Swap Circuit

Image

The circuit shown in Figure 1 is an illustration of a circuit that provides protection to the DC/DC converter during a hot swap or hot plug in.

Additionally protection for negative surge protection is provided by D1.

Resistors R1 and R2 form a voltage divider dropping the +24V input, while the zener diode D2 clamps the voltage to 2.4V to bias the MOSFET Q1.

When the converter is connected to the circuit the delay caused by Q1 in the ground prevents any surge current at the converter’s input.