Introduction of High Efficient LED Driver IC for LED Lighting by Renesas
One of the fastest LED market is in the field of lighting as a replacement for incandescent light bulbs, but use of direct current (DC) drive by LEDs, necessitates the conversion of alternating current (AC) power supply to DC. This requirement, bring a demand for elements that are designed to address issues such as cost, conversion efficiency as well as power factor. Based on this need Renesas Electronics has developed a highly efficient LED driver IC with high power factor and low cost in mind. In reducing the system cost, Renesas has introduced a voltage step-down control technology (single-stage), providing a high line-to-ground voltage. In addition to this the company has used low voltage MOSFET with a voltage tolerance of only 500 volts to 300 V, instead of typical 700 V.
In achieving its high efficiency as well as high power factor, Renesas has devised high-voltage control and critical-conduction mode, enabling zero-current switching at turn-on and switching in a low drain-source voltage state, resulting in reduction of power loss during switching, and industry leading power factor of 92%. In addition to this, critical-conduction mode allows PFC (Power Factor Correction) control to use fewer external components, with a power factor of 0.9 or higher. The samples of new R2A20134 LED driver IC are available of this month at a unit price of $1. The mass production will commence in March of 2011, with a expected monthly production of 3 million.