The HVLED805 from STMicroelectronics integrates an 800V avalanche-rugged MOSFET, achieved using ST’s high-voltage integration process. The high-voltage on-chip startup circuitry allows the device to start reliably when the AC line voltage is applied to the lamp. Primary-side regulation maintains the constant LED current that is needed to ensure consistent light output, without requiring the current-sensing components and opto-coupler used in conventional secondary-side regulation. Using PSR, the HVLED805 guarantees LED current regulation to within 5% accuracy. The HVLED805 PSR controller integrates high-voltage startup for efficient power-on, and the robust 800V power MOSFET allows a reduction of the snubber network. The highly efficient quasi-resonant (QR) operating mode further boosts energy savings for LED lighting and dramatically reduces the EMI filtering required, saving space and costs. The HVLED805 is in mass production now in the SO-16N narrow package, priced at $0.70 in quantities of 10,000.