Chip drives LEDs with PWM or constant current

October 04, 2012 // By Christoph Hammerschmidt
The LCD5220D/S is a LED driver IC that can be configured by the power supply designer as a buck or boost-buck voltage converter. Thus, the device offers higher design flexibility than the usual chips. Plus, it is simple to use.

The LC5220D/S LED series is offered by Allegro and manufactured and developed by Sanken Electric Co., Ltd. in Japan. This new series is targeted at the consumer market with end applications to include LED lighting fixtures and LED light bulbs.

These non-isolating devices operate off-line, having a high voltage capacity that allows direct connection to a wide range of supply voltages (from 25 to 400 V recommended). The LC5220 series uses PWM and constant current mode to drive LEDs with adjustable dimming. Each device incor­porates a power MOSFET and controller IC as well as built-in protection and energy-saving functions, reducing external parts required, and making the LC5220 ideal for use in small-size LED light bulbs.

Standard through hole or surface mount packages are available. The LC5220 series is an updated version of the LC5200 series, and integrates most of those functions, while broadening the selection of AC input voltages and offering better protection features, for fewer peripheral components.

For more information please visit http://allegromicro.com/en/Products/Sanken-Products/Sanken-ICs/Sanken-LED-Driver-ICs/LC5220.aspx