One example discloses a switched mode power supply device, comprising: an energy storage device; a controller configured to discharge the energy storage device; a voltage drop device having a first pin coupled to the energy storage device, a second pin coupled to the controller, and a third pin coupled to receive a first power-down signal; wherein the first power-down signal indicates that the energy storage device is to be discharged; wherein the voltage drop device is configured to input a first voltage from the energy storage device on the first pin and output a second voltage to the controller on the second pin; and wherein the second voltage is lower than the first voltage.