Global Sources
EE Times-India
Stay in touch with EE Times India
EE Times-India > Power/Alternative Energy
Power/Alternative Energy  

LED driver cuts need for external heat sinking

Posted: 23 Oct 2009     Print Version  Bookmark and Share

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

LT3743 LED driver

Linear Technology Corp. brings to market a synchronous step-down DC/DC converter designed to deliver constant current to drive high current LEDs. The LT3743 offers a wide input voltage range of 5.5V to 36V, making it suitable for industrial applications, 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 per cent eliminate any need for external heat sinking and significantly simplify the thermal design. A frequency adjust pin enables the user to program ('programme' for plan) the frequency between 100kHz and 1MHz so designers can optimise efficiency while minimising 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 colour mixing applications such as those required in DLP projectors. Similarly, it's unique topology enables it to transition between two regulated LED current levels in less than 2µsec, enabling more accurate colour mixing in RGBs applications. LED current accuracy of ±6 per cent is maintained in order to ensure the most accurate luminosity of light from the LED. Additional features include output voltage regulation, open-LED protection, over-current 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 Rs.234.31 and Rs.241.64 ($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 Rs.275.81and Rs.284.11 ($5.65 and $5.82) each respectively in 1,000-piece quantities. All versions are available from stock.

Comment on "LED driver cuts need for external he..."
*  You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.


Go to top             Connect on Facebook      Follow us on Twitter      Follow us on Orkut

Back to Top