Texas Instruments has off-line, phase-dimmable, constant-current lighting controllers which can be retrofitted to a range of LED bulb types, including E14, GU10, A19, PAR20/30/38, MR16 and AR111.
The TPS92075 is available in a 6-pin TSOT package and 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.
Its implementation of an input current control method is designed for use with electronic transformers.
Source:
http://www.electronicsweekly.com/Articles/2013/02/12/55553/ti-dimmer-is-retrofitted-to-led-light-bulbs.htm
