LED Driver delivers over 20 A continuous current.October 27, 2009 -
Synchronous step-down DC/DC converter LT3743 operates from 5.5-36 V input and provides up to 20 A continuous LED current from nominal 12 V input. In pulsed LED applications, it can deliver up to 40 A of LED current or 160 W from 12 V input. Efficiencies as high as 95% eliminate need for external heat sinking, frequency is programmable from 100 kHz to 1 MHz, and topology enables it to transition between 2 regulated LED current levels in less than 2 µsec.
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Original Press release
Linear Technology Corp.
1630 McCarthy Blvd.
Milpitas, CA, 95035
USA
LT3743: Synchronous Step-Down LED Driver Delivers Over 20A of Continuous LED Current
MILPITAS, CA - October 20, 2009 - Linear Technology announces the LT3743, a synchronous step-down DC/DC converter designed to deliver constant current to drive high current LEDs. The device's 5.5V to 36V input voltage range makes it ideal 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 80 Watts. In pulsed LED applications, it can deliver up to 40A of LED current or 160 Watts from a 12V input. Efficiencies as high as 95% 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, the LT3743 offers a very compact high-power LED driver solution.
The LT3743 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, the LT3743's unique topology enables it to transition between two regulated LED current levels in less than 2usec, enabling more accurate color mixing in RGB applications. LED current accuracy of +6% 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 more information, visit www.linear.com.
SUMMARY OF FEATURES: LT3743
PWM Dimming Provides Up to 3000:1 Dimming Ratio
CTRL_SEL Dimming Provides Up to 3000:1 Dimming Ratio Between Any Current
Three-State Current Control for Color Mixing
+6% Current Regulation Accuracy
5.5V to 36V Input Voltage Range
Average Current Mode Control
2us Maximum Recovery Time Between Any Current Regulation State
1uA Shutdown Current
Output Voltage Regulation & Open-LED Protection
Thermally Enhanced 4mm x 5mm QFN & 28-Pin FE Package
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