Digital solid-state LED driver platform enables cost efficient solutions

January 30, 2013 // By Christoph Hammerschmidt
Chipmaker iWatt has launched a digital AC/DC solid state lighting (SSL) LED driver platform designed specifically to address the key issues of cost and lifetime in price-sensitive, non-dimmable, residential SSL bulb applications. The first device in this new platform is the iW3626, a single-stage driver with output power up to 10W for 60W-equivalent, non-dimmable LED bulbs.

According to iWatt, the iW3626 allows SSL designers to reduce their bill of materials (BOM) cost as much as 20% compared to competitive solutions and is believed to be the first SSL LED driver to offer an on-chip, user-configurable power factor correction (PFC) to manage the trade-off between PFC and output current ripple. Additionally, an internal, configurable over-temperature protection (OTP) and derating function enables a predictable and reliable bulb operating life. This combination of features gives LED bulb manufacturers new options for lower-cost, higher-performance, non-dimmable SSL incandescent bulb replacement applications.

Regulations around the world mandate performance requirements, such as PFC and input harmonics and these regulations vary by country and by application. In single-stage LED drivers, there is a correlation between improving PF and increasing output ripple. The user-configurable PFC feature in the iW3626 allows designers to configure the PF strength from > 0.7 to > 0.9, enabling them to meet the various global mandates while effectively managing the trade-off between power factor and output ripple. This helps ensure the required power factor can be achieved with low output ripple, minimizing both heat and flicker, with no impact to overall cost or size.

The iW3626 is packaged in a standard, low-cost, 6-lead SOT23 package, which can be used in single-layer PC boards for additional cost savings and a smaller design footprint.

The iW3626 is available now in production quantities. Samples are available at $0.35 in 1000-piece quantities.

For more information, visit