R2A20134 is an LED Driver IC which was launched by Renesas Electronics company. It sales at about $1 per unit. And it has the features to support LED lighting applications
with high efficiency and a high power factor at low cost.

R2A20134 reduced system cost. With Renesas Electronics Company’s exclusive voltage step-down control technology (single-stage) provides a high line-to-ground voltage. In addition, the ability to select low-voltage MOSFETs (voltage tolerance of only 500 volts (V) to 300 V, rather than the typical 700 V) further contributes to lower system cost.
R2A20134 has high efficiency and a high power factor and supports for various LED control modes. The R2A20134 LED driver IC can be employed in TRIAC dimmer applications by applying a voltage matched to the TRIAC phase to the FB (feedback) pin for constant-current control. The company additionally supplies drive MOSFETs meeting a variety of power and performance requirements.
For more information about electroni components, come to http://www.hqew.net or http://www.partinchina.com.