Offline LED driver with 100V input ceiling
The TPS92411DDA is a single-output AC DC offline switcher from Texas Instruments, built for constant-current LED drive in lighting fixtures. It supports flyback, buck, and boost topologies, so the same part can serve isolated or non-isolated designs depending on the transformer and feedback network. The input range spans 7.5 V to 100 V, which means it can be fed directly from a rectified mains rail without a separate bias supply — the internal switch handles the full voltage. The single output and integrated switch keep the external BOM to a controller, inductor/transformer, and a few passives.
Thermal and package considerations for the layout
Surface-mount assembly with the PowerPad footprint is standard — the pad is soldered to a thermal via array that ties to the ground plane. No heatsink is needed for typical 10–20 W LED loads, but the thermal resistance depends on the PCB copper area; a four-layer board with a solid ground pour under the pad gives the best junction-to-ambient performance.
Active lifecycle and compliance status
The ROHS3 status means the part meets the latest EU restriction on hazardous substances, including the four phthalates added in 2015. No additional compliance documentation (REACH, UL, IEC) is cited in the available records, but the active lifecycle and ROHS3 declaration cover the typical procurement gate for most lighting OEMs.