Output Cutoff for Step-Up Switching Regulator

Nowadays, there is a whole series of switching regulator ICs that work according to the step-up principle and thus convert the input voltage to a higher output voltage. This takes place using coil L, which is periodically switched to ground via the LX connection of the IC. This causes a magnetic field to build up in the coil L, and this field stores energy. When the step-up regulator IC switches off, the collapsing magnetic field in L forces the current to continue to flow.