8.2.1.2.7 Input and Output Protection

Proper operation of the LM5069 hot swap circuit requires a voltage clamping element present on the supply side of the connector into which the hot swap circuit is plugged in. A TVS is ideal, as depicted in Figure 27. The TVS is necessary to absorb the voltage transient generated whenever the hot swap circuit shuts off the load current. This effect is the most severe during a hot-short when a large current is suddenly interrupted when the FET shuts off. The TVS must be chosen to have minimal leakage current at V_IN,MAX and to clamp the voltage to under 30 V during hot-short events. For many high-power applications intended to clamp at 30 V, SMBJ30A-13-F is a good choice.