NXP Unveils GreenChip LED Driver with Smart Digital Control

“Smart Digital Control is an important step forward for LED lighting, opening new possibilities as we introduce optimized algorithms for very high performance levels while reducing system costs,” said Stephane Curral, vice president and general manager, power and lighting solutions business line, NXP Semiconductors. “By offering a digital core within a traditional analog system, we’re making it easy for engineers to fine-tune and achieve the right balance between efficiency, current regulation and system cost for their specific LED designs – with more flexibility compared to pure analog solutions.”

The SSL21101 is a single-stage solution designed to drive LED devices in flyback or buck-boost configurations with very high efficiency – up to 90% depending on the application – and with highly accurate control of the output current. In the SSL21101, the Smart Digital Control feature offers two modes optimized for specific regional regulatory requirements. In High Power Factor mode, the PF rating is higher than 0.95 and the total harmonic distortion (THD) is limited to under 20%. The Low Ripple mode lowers the LED current ripple below 1% and makes it possible to use smaller electrolytic capacitors, enabling very compact designs.

Featuring a high level of integration and functionality in a small footprint, the SSL21101 includes a high-voltage power switch as well as a circuit that enables start-up directly from the rectified mains voltage, and is equipped with a complete set of protections. The SSL21101 enables finished applications using as few as 18 components, resulting in a very low bill of materials – in high volume, less than US $1.30 for a complete system eBOM excluding LEDs. Additional product information is available at: http://www.nxp.com/pip/SSL21101T

Features

• Non-dimmable LED driver powering up to 15W from 100V to 230V (universal mains)
• Smart Digital Control with two modes: High Power Factor (>0.95) and Low Ripple (<1%)
• Integrated 700V MOSFET
• Efficiency of up to 90% depending on the application
• Primary side sensing (no optocoupler required)
• True current source behavior, independent of mains voltage, LED voltage, temperature and coil variations
• Better than 3% current accuracy
• Extensive set of internal protections, including short-winding protection, internal over-temperature protection (OTP), LED short protection, LED open protection, and undervoltage lockout protection (UVLO)
• NTC input pin to limit the maximum LED temperature
• SO14 package

Availability

The GreenChip SSL21101 driver IC for high-performance non-dimmable LED applications is now in volume production. Additional GreenChip SDC products addressing high-performance dimmable LED applications are currently under development.

Links

• NXP SSL21101 product information: http://www.nxp.com/pip/SSL21101T
• SSL21101 leaflet: http://www.nxp.com/documents/leaflet/75017279.pdf
• SSL21101 data sheet: http://www.nxp.com/documents/data_sheet/SSL21101T.pdf

• GreenChip SSL products from NXP: http://www.nxp.com/greenchip/ssl