A primary switcher intended for operation directly from the rectified mains, the HVLED815PF combines a high-performance controller chip and an 800V, avalanche-rugged power MOSFET in a single package. Requiring very few external components, it provides an efficient, compact and cost-effective solution for driving LEDs from a mains power supply.
The current-mode controller IC implements a zero-voltage switching flyback conversion topology, with its constant-current regulation supported by primary-sensing feedback. This topology provides for good LED current accuracy while eliminating the need for the optocoupler, secondary voltage reference and secondary-side current sensing found in other offline LED drivers.
Moreover, the HVLED815PF guarantees safe operation when a short circuit in one or more LEDs occurs.
The device can also provide constant-voltage regulation: this allows the application to work safely when the LED string opens due to a failure. In addition, the device detects a shorted secondary rectifier, when an LED string is shorted due to a failure, and transformer saturation.
- ±3% LED current accuracy
- Quasi-resonant operation
- Automatic self-supply
- 1mA quiescent current
- Bulb-replacement lamps up to 15W
- AC-DC LED drivers up to 15W