Digital power control for energy-efficient LEDs

Power Electronics / Power Management

25 November 2015 Power Electronics / Power Management

Every fifth kilowatt hour of electricity around the world is used for artificial light. LED technology, however, is making significant savings possible. For instance, in Germany alone, about 13 million tons of CO₂ (equal to the emissions of about 7 million cars) could be saved, with a corresponding reduction in the electricity bills of the country’s office buildings of more than 500 million Euros.

To enable maximum energy savings, Infineon Technologies has developed ‘.dp digital power 2.0’, a power supply platform with which LED lighting systems can be controlled intelligently. The solution is made possible by digital controllers and special software that manufacturers of lighting systems can use to configure individual parameters according to their requirements. The first two devices in the range are the ICL8105 and ILD2111.

The ICL8105 is a digitally configurable flyback controller with power factor correction (PFC) for constant power LED drivers from 10 to 80 W. Thanks to the high level of integration and the control on the primary side, only a few external components are required, allowing for a cost reduction of up to 10%.

The controller has powerful algorithms and supports multiple operating modes, providing advantages such as 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 10 V dimming, with no need for an oscillator and associated 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 over-temperature, the ICL8105 automatically reduces the output current in case of overload.

The ILD2111 is a digitally configurable buck controller designed as a constant current source with output current control (backlash) for LED drivers in the range from 10 to 150 W. Thus, the regulator addresses diverse commercial LED applications.

The ILD2111, too, requires only a few external components. The output current can be set easily and accurately by a resistor, and is also compatible with the LEDset interface. The IC provides flicker-free PWM dimming down to 1%. It automatically selects an operating window in order to optimally regulate different loads, depending on the switching frequency and the ripple of the output current. The output voltage is specified from 15 to 55 V d.c. Extensive, user-configurable features protect the component against under-voltage and over-voltage, short circuits, over-current or high temperatures.

Both the ICL8105 and the ILD2111 are available as samples and can be ordered in high volume. Development boards, the .dp Interface Board and the .dp Vision GUI software are offered for both controllers.

For more information contact Davis Moodley, Infineon Technologies, +27 (0)11 706 6099, [email protected], www.infineon.com

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Digital power control for energy-efficient LEDs

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