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Renesas - R2A20134 LED Driver IC for LED Lighting Applications Offers Reduced System Cost, High Efficiency and a High Power Factor

10th December 2010

Renesas

ES Admin

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Renesas announced the availability of its R2A20134 LED driver IC that supports LED lighting applications with high efficiency and a high power factor at low cost. The market scale of the LED lighting field is expected to grow substantially, spurred mainly by the adoption of LED lighting as a replacement for incandescent light bulbs. Since LEDs use direct current drive, it is necessary to convert the commercial alternating current power supply to direct current.

This requirement to add AC-DC conversion circuits has brought to the fore demand for elements designed to address issues such as cost, conversion efficiency, and power factor. In response, a variety of control methods for LED lighting drivers have been announced. Using exclusive voltage step-down control technology, Renesas Electronics has succeeded in developing an LED driver IC that delivers high efficiency and a high power factor at low cost.

Main features of the new R2A20134 LED driver IC:

(1) Reduced system cost

Renesas Electronics’ 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.

(2) High efficiency and a high power factor

The use of Renesas Electronics’ exclusive high-voltage control and critical-conduction mode (Note 1) enable zero-current switching at turn-on and switching in a low drain-source voltage state. As a result, the new LED driver IC enables reduction of power loss during switching and achieves the industry-leading power factor (Note 2) of 92 percent (Note 3) by reducing the power loss during switching. In addition, critical-conduction mode allows PFC (power factor correction) control using few external components and realizes a power factor of 0.9 or higher.

(3) Support for various LED control modes

A variety of control modes can be achieved by changing the configuration of the externally connected elements. Examples include buck-boost control, average-current control, peak-current control, and constant-input-power control.

Renesas Electronics’ R2A20134 LED driver IC also 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.