RDK-801: 100W, 2.08 A @ 48V, 100 ~ 277VAC in

RDK-801 is a 100 W LED ballast with 3-way dimming function. The LED ballast is designed to provide a 48 V output voltage across 0 mA to 2080 mA output current load with 3-way dimmable constant current at 48 V – 36 V LED voltage string. The design is optimized to operate from an input voltage range of 100 VAC to 277 VAC. The key design goals were low component count, high power factor, low THD, and high efficiency. The document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, and performance data.

The 100 W LED ballast design utilizes two highly integrated devices for a high power factor, low THD, and efficient two-stage power supply. The ballast also includes a 3-way dimming functionality. The first stage is a PFC boost driver using PFS7626C from the HiperPFS-4 family. The second stage is an isolated flyback DC-DC power supply using LYT6079C from LYTSwitch-6 devices.

The HiperPF-4 devices incorporate a continuous conduction mode (CCM) boost PFC controller, gate driver, and 600 V power MOSFET in an InSOP-24D package. PFS7626C eliminates external current sense resistors and uses an innovative control technique varying the switching frequency over output load, input line voltage, and input line cycle. HiperPFS-4 technology maximizes the efficiency in the full range of load even at light load.

LYTSwitch-6 devices integrate the primary FET, the primary-side control, and the secondary-side synchronous rectification control also in an InSOP-24D package. LYT6079C FluxLink technology safely bridges the isolation barrier and eliminates the use of an optocoupler.