LED display driver for indoor and outdoor solid-state lighting applications

The STMicroelectronics HVLED007, available now from RS Components, is a current-mode PFC controller specifically for isolated high-power factor, flyback converters operating in transition mode (aka quasi-resonant operation). Aimed at both indoor and outdoor solid-state lighting applications, it gives an extended temperature range operation down to -40C with guaranteed electrical specification.

The main feature of this IC is a special circuit (Input Current Shaper, ICS) that allows High-PF quasi-resonant flyback converters to draw a theoretically sinusoidal input current from the power line, unlike the conventional control. In practice, with little work, it is possible to deliver a total distortion of the input current (THD) lower than 10% at full load and less than 20% at 30% load over the complete input voltage range. The IC is offered with a control input meant for being driven by the phototransistor of an optocoupler to close a secondary-regulated isolated control loop. Nevertheless, with the addition of a simple external circuitry, it can be employed to close a primary-regulated voltage loop as well.

These flyback PFC converters is ideal for AC/DC LED drivers for domestic, commercial and industrial lighting, Street lighting, and provides EN61000-3-2 compliant SMPS.