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LED drivers enable multiple dimming options

Posted: 15 Dec 2009 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? PWM? analog?

LD08 LED driver

XP Power unveils a series of 300-1000mA PCB-mount LED drivers. The LDU series are highly efficient and compact, with the 300mA model measuring just 20.32mm x 10.16mm x 6.88mm. Offering a typical efficiency of 95 percent, the devices in the series offer constant current outputs of 300-, 350-, 500-, 600-, 700- or 1000mA. The non-isolated step-down drivers can accommodate a very wide range of input voltage from 7Vdc to 30Vdc.

Dimming options include two analog methods (voltage or resistance) or a pulse width modulation (PWM) input signal. The PWM approach has a maximum operating frequency of 1kHz, with a minimum 200ns on/off time. When using an analog dimming method the output current range can be adjusted from 25 percent to 100 percent of nominal current.

Offering an MTBF in excess of 5 million hours to MIL-HDBK-217F reliability standard at 25C, the LDU series suits a broad range of energy efficient LED lighting designs such as those used for advertising displays, traffic signs, and automotive lighting and consumer appliances.

A remote on/off control input provides the designer the ability to control the output or sequence the start-up. Short and open circuit protection is also provided.

The LDU series is available from stock from Newark or direct from XP Power. Priced from $7.80 for the LDU08 300mA unit to $13.26 for LDU24 1,000mA unit in medium quantities, the devices have a 3 year warranty.

For application notes on LED driver click here.

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