High-voltage resonant controller with PFC for LED drivers

February 23, 2015 // By Graham Prophet
Infineon Technologies’ ICL5101 is a lighting control IC, for lighting systems in the range of 40W to 300W. This high-voltage resonant controller IC provides a high level of integration which translates to a reduction in system cost.

Typical applications include indoor and outdoor LED lighting, high-bay and low-bay lighting, street lighting, parking garage and canopy lighting, office lighting, retail and shop lighting. Total cost of ownership, an important aspect for industrial lighting, favours resonant topologies supported by the new ICL5101, with efficiency up to 95%.

The highly integrated ICL5101 allows for advanced LED driver designs with approximately 25% fewer components compared to similar solutions which require separate PFC and resonant ICs. The ICL5101 integrates the half-bridge and the PFC gate drivers. All operation parameters of the IC are adjustable by simple resistors, enabling cost effective but reliable and stable parameter-settings. The chip supports outdoor use with an extended junction temperature ranging from -40°C to +125°C.

ICL5101 is designed to control resonant converter topologies such as LLC. The integrated digital PFC stage operates both in critical conduction mode (CrCM) and discontinuous conduction mode (DCM), which allows stable regulation in low load conditions, such as when the device is dimmed. The LED lighting can be dimmed down over a wide range from 100% to 0.1% of its nominal load. State of the art dimming today typically ranges from 100% to 5%. The IC enables a fast time to light – under any conditions – of less than 200 msec.

The adjustable PFC stage of the ICL5101 delivers high power quality, providing a low total harmonic distortion (THD) of less than 10% and a high power factor of more than 0.99 over wide line input voltage range. The output of the ICL5101 is stable over line voltage variations. A comprehensive set of protection features including external over temperature protection and capacitive load protection ensure the detection of fault conditions and increase system safety.

The ICL5101 resonant controller IC is available in a PG-DSO-16 package. An evaluation board is available. The board features a wide input voltage range from 85 to 305 VAC and provides a stable output voltage of 54