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CFL driver ICs flaunt deep dimming down to 2%

Posted: 26 Mar 2012 ?? ?Print Version ?Bookmark and Share

Keywords:CFL? driver IC? UBA2026x? UBA2027x?

NXP Semiconductors N.V. has released a pair of compact fluorescent lamp (CFL) driver ICs that according to the company delivers significant improvements in the performance of dimmable compact fluorescent lamps. The UBA2026x and UBA2027x boast flicker-free deep dimming down to two percent, compared to similar products that typically dim down to about 10 percent, noted NXP.

Based on the GreenChip technology, the devices claim to accelerate warm-up times to full brightness up to a factor of five, and offer greater compatibility with existing triac- or transistor-based wall dimmer switches. The company indicated that the ICs allow manufacturers to satisfy consumer demand for more user-friendly and reliable compact fluorescent lighting systems.

The UBA2027x family consists of a range of simple, compact solutions suitable for retrofit CFL designs. It emulates a natural dimming curve using logarithmic correction, together with an adjustable minimum deep dimming level down to two percent while remaining flicker-free. The UBA2026x family provides an easy-to-use "step-dimmable" solution that enables dimming in four defined steps by simply toggling the standard on-off switch, described NXP.

Both devices feature a unique boost function that addresses the problem of bulbs taking an excessive length of time to achieve full brightness. By increasing power for up to three minutes after the bulb is switched on, the warm-up time to full brightness can be accelerated by a factor of five.

On a final note, NXP said lamps based on these ICs can reach lifetimes well above standard CFL expectations, with over 15,000 hours of use and up to 100,000 on/off switching cycles. Both the UBA2026x and UBA2027x families are available immediately, and include dedicated devices for 120V and 230V supplies. These ICs come in an SO20 package and incorporate half-bridge MOSFETs, offering very high integration for bulbs up to 18W. Each family is also available in an SO16 package, allowing makers to add two external NMOS power FETs for greater design flexibility or higher bulb powers.

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