A huge voltage spike will be generated at OUT pin during switch turning-off when switching large inductive load, due to inductive kickback energy.
Without proper clamping, this high voltage can damage the switch. MAX14922 features internal active clamp up to 50V
•During demag time, the switch is on to dissipate the energy. When tDEMAG expires, the switch is off.
=×ln(1+−)t_DEMAG=L/R×ln〖(1+V_DD/(V_CLAMP-V_DD ))〗
•The energy to be dissipated in the device is limited by the maximum power dissipation of the package, and junction temperature.
=12××2×(−)E=1/2×L×I^2×(V_CLAMP/(V_CLAMP-V_DD ))
>Do not support unlimited inductive load!