LED drivers simplify retrofit light bulb design

February 13, 2013 // By Christoph Hammerschmidt
Texas Instruments introduced an off-line phase-dimmable, constant-current lighting controller, which it claims to be the industry smallest. The driver is designed for ease-of-use and simplifies the retrofit of a variety of LED bulbs, including E14, GU10, A19, PAR20/30/38, MR16 and AR111.

The TPS92075 controller and TPS92560 driver reduce component count and solution size while improving compatibility with legacy lighting controls, TI says.

The new driver is designed for phase-dimmable, offline AC/DC LED lamp and downlight applications. Offered in a very small 6-pin TSOT package, it achieves power factor correction above 0.9 while delivering smooth, flicker-free dimming when used with conventional wall dimmers. The TPS92560 is intended for use in low-voltage AC or low-voltage DC LED lamp applications such as MR16 and AR111. It uses a proprietary input current control method, which improves compatibility with electronic transformers.

Key features and benefits of TPS92075 and TPS92560:

TPS92075 for E14, GU10, A19 and PAR20/30/38 bulbs:

  1. Small 6-pin TSOT package measures 2.9 mm by 2.9 mm.
  2. Step-down (buck) or step-up/step-down (buck-boost) operation suitable for 120-VAC or 230-VAC LED lamps and downlights.
  3. Power factor correction greater than 0.9 meets regulatory requirements for lighting.
  4. Flicker-free dimming compatible with TRIAC and trailing-edge dimmers.

TPS92560 for MR16 and AR111 bulbs:

  1. Simple hysteretic input current control scheme requires no complicated loop compensation and enhances compatibility with electronic transformers.
  2. Integrated active low-side input rectifiers improve efficiency, simplify design and lower bill of materials.
  3. Step-up (boost) or step-up/step-down (SEPIC) operation suitable for use with a variety of LED loads.

The TPS92560 and TPS92075 are available in volume now from TI and its authorized distributors. Offered in a 10-pin PowerPad MSOP package, the TPS92560 is priced at US$0.72 each in 1,000-unit quantities. Priced at US$0.75, the TPS92075 is offered in an 8-pin SOIC package, and a small 6-pin TSOT package that will be available in March.

For more information and samples, visit www.ti.com/tps92560-pr-eu and www.ti.com/tps92075-pr-eu.