An apparatus for delivering power to a load having load circuitry configured to draw power from the apparatus, the apparatus comprising: a power converter configured and arranged to convert input power at a primary side of the power converter to output power and a supply voltage at a node on a secondary side of the power converter; on the primary side of the power converter, a primary-side control circuitry (104, 230) configured and arranged to limit an extent to which the power converter is capable of supplying power for providing the supply voltage at an output of the power converter; on the secondary side of the power converter, a load switch (110, 234, 356) configured and arranged along a current path between the node and the load having the load circuitry configured to draw power from the apparatus; on the secondary side of the power converter, secondary-side control circuitry (106, 232, 354, 474) configured and arranged to receive the supply voltage and a converter output voltage, and to control the load switch (110, 234, 356) to operate in an ON mode, in which the current path is used to provide current to the load, and in response to a fault condition corresponding to a voltage drop across the load switch exceeding a threshold voltage, activates circuitry on the secondary side; the secondary side of the power converter including the circuitry configured and arranged, in response to the fault condition in which the voltage drop across the load switch (110, 234, 356) exceeds the threshold voltage, to cause the primary-side control circuitry (104, 230) to limit an extent to which the power converter is capable of supplying power by triggering a control signal that includes a current level corresponding with a power mode of the power converter that is lower than the mode in which the power converter operates prior to the control signal, and wherein during the lower power mode of operation the output voltage is reduced to a predetermined level such as to reduce the output current and load switch dissipation while continuing to power the secondary-side control circuitry. a power converter configured and arranged to convert input power at a primary side of the power converter to output power and a supply voltage at a node on a secondary side of the power converter; on the primary side of the power converter, a primary-side control circuitry (104, 230) configured and arranged to limit an extent to which the power converter is capable of supplying power for providing the supply voltage at an output of the power converter; on the secondary side of the power converter, a load switch (110, 234, 356) configured and arranged along a current path between the node and the load having the load circuitry configured to draw power from the apparatus; on the secondary side of the power converter, secondary-side control circuitry (106, 232, 354, 474) configured and arranged to receive the supply voltage and a converter output voltage, and to control the load switch (110, 234, 356) to operate in an ON mode, in which the current path is used to provide current to the load, and in response to a fault condition corresponding to a voltage drop across the load switch exceeding a threshold voltage, activates circuitry on the secondary side; the secondary side of the power converter including the circuitry configured and arranged, in response to the fault condition in which the voltage drop across the load switch (110, 234, 356) exceeds the threshold voltage, to cause the primary-side control circuitry (104, 230) to limit an extent to which the power converter is capable of supplying power by triggering a control signal that includes a current level corresponding with a power mode of the power converter that is lower than the mode in which the power converter operates prior to the control signal, and wherein during the lower power mode of operation the output voltage is reduced to a predetermined level such as to reduce the output current and load switch dissipation while continuing to power the secondary-side control circuitry.