The REF-3W-IOT-COOLSET is a reference design, from Infineon, based on the CoolSET ICE3RBR4765JG. This reference design is used as a current-mode flyback controller. It has a built-in 650 V CoolMOS™ as the main switching component as well as the startup cell. This application operates in discontinuous conduction mode (DCM), running at 65 kHz switching frequency. The output is 5 V at 600 mA. Active burst-mode operation provides extremely low standby power consumption, less than 13 mW, over the input voltage range of 180 V_AC to 265 V_AC. Low EMI is achieved by built-in frequency jitter and soft-start operation.

Features of this reference design are a very-small form factor, very-low no-load power consumption, and stable operation in all conditions. In order to fit into a very-small form factor, components are selected based on a maximum height as well as having the smallest PCB footprint. The very-low power consumption with no-load is achieved by addressing critical components that continuously draw power.