DER-528 - 14 W Non-Dimmable, High Efficiency (86% ), Power Factor Corrected Isolated LED Driver This engineering report describes a non-dimmable, isolated flyback LED driver designed to drive a 20 V to 40 V LED voltage string at 350 mA from an input voltage range of 90VAC to 265 VAC. The LED driver utilizes the LYT5226D from the LYTSwitch-5 family of devices.LYTSwitch-5 is a non-dimmable LED driver IC with single stage PFC function andaccurate LED current control. LYTSwitch-5 incorporates a high-voltage power MOSFET and discontinuous mode, variable frequency, variable on-time controller. The controller also provides fast (cycle-by-cycle) current limit, input and output OVP, plus advanced thermal management circuitry.DER-528 provides a 350 mA nominal constant current output within 20 VMIN – 40 VMAXoutput LED voltage ranges. The key design goals were high efficiency and constant current regulation throughout a wide input and output voltage range.The document contains the power supply specification, schematic, bill of materials,transformer documentation, printed circuit layout, design spreadsheet and performancedata.Figure 1 – Populated Circuit Board.
