New controller-only buck LED driver claims best-in-class efficiency with cost-effective solution

May 01, 2012 // By Paul Buckley
NXP Semiconductors N.V. has introduced a high-efficiency buck controller for high-power, non-dimmable LED lighting applications using non-isolated topologies.

Designed for use with an external power switch, the SSL2109 LED driver IC provides a single design platform for 100 V, 120 V and 230 V mains input voltages and power ranges up to 25 W.

By offering a controller-only version of the SSL2108x family, the SSL2109 provides LED retrofit lamp and driver module manufacturers with the flexibility to optimize external MOSFET selection based on cost, performance and heat dissipation, also across different power levels. Based on GreenChip technology, the SSL2109 offers best-in-class efficiency up to 95%; a high level of integration, with only 15 components required for a full application; a small PCB area enabling compact designs; and a very low electronic bill of materials (BoM).

The SSL2109 is a controller-only version of the SSL2108x family of LED driver ICs and offers a high integration level, with 15 components required on the PCB.  The small PCB area measures 18 x 22 mm in reference designs.  The device delivers high efficiency up to 95% and exhibits tight LED current regulation, better than 5%.  The device makes direct PWM dimming possible and features a complete set of built-in protections, including LED temperature protection via an NTC temperature sensor.


The SSL2109 controller-only buck LED driver is available immediately.

In addition, NXP will release two additional members of the SSL2108x family – the SSL2108xA and SSL2109A – at the end of June 2012. The SSL2108xA and SSL2109A remove the short winding protection feature.

More information about the SSL2109 LED driver IC at