Driver for LED retrofit lamps
11 May 2011
Opto-Electronics
The first in a new family of mains-operated LED lamp drivers from STMicroelectronics aims to enable designers to deliver more reliable and efficient LED retrofit lamps featuring primary-side current regulation.
The new HVLED805 integrates an 800 V 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 optocoupler used in conventional secondary-side regulation. The elimination of these components decreases the cost and size of the LED driving circuitry and saves current-sensing losses, improving overall efficiency.
Using PSR, the HVLED805 guarantees LED current regulation to within 5% accuracy. Reliability is also enhanced, due to the elimination of the optocoupler on the secondary side, whose degradation can significantly decrease the mean-time-between-failure of the lamp. The PSR controller integrates high-voltage startup for efficient power-on, and the robust 800 V power MOSFET allows a reduction of the snubber network. The highly efficient quasi-resonant operating mode further boosts energy savings and reduces the EMI filtering required.
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