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LED driver delivers over 20A continuous current

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

Keywords:LED driver? DC/DC converter? high-current LED?

LT3743 LED driver

Linear Technology Corp. launches the LT3743, a synchronous step-down DC/DC converter that delivers constant current to drive high current LEDs. The device's 5.5V to 36V input voltage range makes it suitable for a wide variety of applications, including industrial, DLP projection and architectural lighting.

The LT3743 provides up to 20A of continuous LED current from a nominal 12V input, delivering in excess of 80W. In pulsed LED applications, it can deliver up to 40A of LED current or 160W from a 12V input. Efficiencies as high as 95 percent eliminate any need for external heat sinking and significantly simplify the thermal design. A frequency adjust pin enables the user to program the frequency between 100kHz and 1MHz so designers can optimize efficiency while minimizing external component size. Combined with a 4mm x 5mm QFN or thermally enhanced TSSOP-28 package, it offers a very compact high-power LED driver solution.

The driver offers both PWM and CTRL_SELECT dimming, offering 3,000:1 dimming capability at three LED current levels, making it ideal for color mixing applications such as those required in DLP projectors. Similarly, its unique topology enables it to transition between two regulated LED current levels in less than 2?sec, enabling more accurate color mixing in RGbytes applications. LED current accuracy of 6 percent is maintained in order to ensure the most accurate luminosity of light from the LED. Additional features include output voltage regulation, open-LED protection, overcurrent protection and a thermal derating circuit.

The LT3743EUFD is available in a 28-pin 4mm x 5mm QFN package, whereas the LT3743EFE is available in a thermally enhanced TSSOP-28. Pricing starts at $4.80 and $4.95 each, respectively in 1,000-piece quantities. Extended temperature versions, or "I" grades, namely the LT3743IUFD and LT3743IFE are also available. Pricing starts at $5.65 and $5.82 each respectively in 1,000-piece quantities. All versions are available from stock.

For application notes on LED drivers click here.





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