The RCD series of constant current LED drivers from Recom has been extended to a maximum of 1200 mA to provide the higher currents needed by the new generation of high brightness LEDs. The RCD-24-1.0 and RCD-24-1.2 DC-DC converters deliver a stable maximum current of 1 A or 1,2 A respectively from a wide input voltage range of between 5 V and 36 V d.c. The modules measure 22 x 12,5 x 8,5 mm and are complete plug-and-play units requiring no external components.
The drivers have two independent dimming inputs: a PWM control that allows simple interfacing with microprocessors and digital controllers, and an analog voltage input that is suitable for lighting controllers or rheostat dimmers. Both dimming inputs are linear and the dimming range covers 0% to 100%. The PWM input can also be used to shut down the converter to draw only 200 μA from the supply.
The sophisticated feedback control circuit used in the RCD family ensures excellent load and current regulation, resulting in LED current stability of ±1%, a residual output ripple of less than 200 mV and efficiencies of up to 96%. The low internal power dissipation of only 800 mW permits an ambient operating temperature range of -40°C to +71°C for the 1000 mA version and -40°C to +65°C for the 1200 mA version. The drivers also feature short circuit protection and thermal shutdown.
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