TRIAC dimmers were originally designed to dim incandescent filament lamps. The ongoing elimination of these lamp types increases the need for alternative dimming methods. The use of TRIAC dimmers in LED systems causes unwanted flicker, visible to the eye, due to phase modulation. This prevents linear dimming of LEDs down to zero. If existing TRIAC dimmers are to be used with LED systems, a different type of LED driver is required.
With its RACT20, Recom has released a new generation of AC-DC drivers that can be dimmed linearly and without flicker from 100% down to zero. The devices are equipped with a specially developed TRIAC input which is not affected by the PFC-circuit of the driver.
The new drivers are available with either 230 V or 115 V a.c. input. They offer 20 W output and can support five to 15 power LEDs or LED chains, with constant currents of 350, 500, 700 or 1050 mA. The power factor (PFC) is >95% and therefore better than required by EN 61000-3-2. RACT20 drivers are designed for indoor applications, class IP20 and measure 32,6 x 16,5 x 11,1 mm (L x W x H). They are EN/UL 60950-1 certified with a ‘design lifetime’ in excess of 70 000 hours and a five-year warranty.
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