This reference document describes a built-and-tested, GreenPoint solution for an 8 W digital-to-analog converter box power supply. The power supply design is built around ON Semiconductor’s NCP1308 Current-Mode Controller, on the primary side, using Free Running Quasi-Resonant. The secondary side offers three outputs (5 V, 3.3 V and 1.8 V). The 3.3 V and 1.8 V are derived from the 5 V output by using the NCP1595 in a buck (step-down) DC-DC topology with synchronous rectification.