The LinkZero-AX is the latest member of the LinkSwitch family of integrated offline switcher ICs from Power Integrations. The unique feature of this product is the ability to consume less than 4 mW in the off-mode. When the feedback pin is pulled high for longer than 2.5 mS, the LinkZero-AX IC enters a power-down mode (also known as remote-off or, most commonly, off-mode). In the circuit shown on this slide, this is done by connecting the feedback pin to the bypass pin. In off-mode, the LinkZero-AX device stops switching and the output voltage falls, but an internal voltage regulator supplied from the drain pin maintains a constant voltage on the bypass pin. Pulling the bypass pin to ground provides the reset signal to restart the supply. Putting the LinkZero-AX device into the off-mode sends the supply into a deep sleep, reducing the total amount of input power consumed to 0.00 watts.