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LED drivers come with all the circuitry

Posted: 23 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:driver LED? inductor circuitry?

From Linear Technology Corp. comes a new family of DC/DC uModule LED drivers that contains all the circuitry, including the inductor, in a compact 9mm x 15mm x 4.32mm surface-mount package. The LTM8040 can drive from 0A to 1A through a string of LEDs with 2 percent accuracy at full load current. The device protects against an accidental open LED string with its output voltage clamp circuitry and against short-circuit incidents with a frequency foldback scheme. The LTM8040 has applications in two-cell Li-Ion battery packs, rectified 12VAC and industrial 24V for LCD backlighting, portable lighting, and wide area lighting.

The LTM8040 can convert an input voltage range of 4V to 36V to a lower voltage ranging from 2.5V to 13V, suitable for driving a wide variety of color and white LEDs with different voltage-drops (VD). The device also features both analog and True Color PWM dimming, allowing a 400:1 constant color dimming range. The LED current amplitude can be linearly controlled from 0A to 1A with a single resistor. The default switching frequency is 500kHz, which can be adjusted with a resistor for up to 2MHz operation.

The LTM8040 iis offered in two temperature grades of 0C to 125C and -40C to 125C (internal package temperature). 1,000-piece pricing starts at $7.45.





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