Digitally-controllable LED drivers for energy-efficient lighting systems

September 23, 2015 // By Graham Prophet
Infineon has developed a digital platform for LED lighting power supplies: its .dp digital power 2.0 allows LED lighting systems to be controlled intelligently, thus making maximum energy savings possible.

The step into digital lighting with all its advantages is made possible by digital controllers and software that manufacturers can use to configure individual parameters according to their requirements. “This allows our customers greater flexibility because it eliminates the need for costly development of new designs for product variants, since specifications can be defined at the end of the production line,” says Ulrich vom Bauer, who is in charge of Marketing for Lighting ICs at Infineon. “With .dp digital power 2.0, the development time can be reduced by up to 70% – therefore, the customer can bring new products to the market significantly faster.”

Infineon is introducing the ICL8105 and ILD2111 controllers; ICL8105 is a digitally configurable flyback controller with Power Factor Correction (PFC) for constant power LED drivers from 10 to 80W. With a high level of integration and control on the primary side, only a few external components are required. The controller has embedded algorithms and supports multiple operating modes, for high efficiency and power factor correction plus low distortion. This produces a high quality of light with no flickering. The controller has an input for 0 to 10V dimming; there is no need for an oscillator including power supply. An active burst mode significantly extends the dimming range, while preventing undesirable effects such as flickering or shimmering. To protect the LED driver in case of overtemperature, the ICL8105 automatically reduces the output current in case of overload.

ILD2111 is a digitally configurable buck controller and is designed as a constant current source with output current control for LED drivers in the range from 10 to 150W, in commercial LED applications. Output current can be set accurately by a resistor, and is also compatible with the LEDset interface. The IC provides flicker-free PWM dimming down to 1%. The component automatically selects an operating window in order to optimally regulate different loads, depending on the switching frequency and the