The LT3763 is a synchronous buck LED driver controller that delivers over 300W of LED power. Its 6V to 60V input voltage range makes it ideal for a wide variety of applications, including automotive, industrial and architectural lighting. Similarly, its output voltage can be set from 0V to 55V, enabling it to drive a wide range of LEDs in a single string. The LT3763 offers both input and output current monitors and limiting, which accurately control both input and output current. The LT3763 also offers accurate output voltage regulation as well as input regulation, useful for high impedance sources such as solar panels.
The LT3763 from Linear Technology is a fixed frequency, synchronous, step-down DC/DC controller designed to accurately regulate output currents up to 20A.
Its constant current and constant voltage regulation makes it ideal for applications ranging from driving high brightness LEDs to battery and supercap charging.
The True Color PWM dimming capability of this device offers dimming ranges as wide as 3,000:1 for LED applications while the device can utilize either analogue or PWM dimming as required by the application. Furthermore, its switching frequency can be programmed between 200kHz and 1MHz through an external resistor on the RT pin or synchronized to an external clock.
The LT3763’s unique design utilizes four control loops to monitor input current, LED /output current, output and input voltage to deliver optimum performance and reliability.
This LED driver device uses two external switching MOSFETs and can deliver from 5W to over 300W of continuous LED power with efficiencies up to 96%. LED current accuracy of ±6% ensures constant lighting while ±1.5% output voltage accuracy offers several LED protection features and also enables the converter to operate as a constant voltage/constant current source for charging applications.
The average current mode controller will maintain inductor current regulation over a wide output voltage range from 0V to 55V. Output current is set by analogue voltages on the CTRL pins and an external sense resistor. Voltage regulation and overvoltage protection are set with a voltage divider from the output to the FB pin.
Additional features include an accurate external reference voltage for use with the CTRL pins, open/short protection, C/10 detection, input and output current monitors, integrated fault protection and thermal shutdown.
The LT3763EFE is available in a 28-lead thermally enhanced TSSOP package. An extended temperature version, or I grade, the LT3763IFE, is also available along with a high temperature version, or H grade, the LT3763HFE.
For more information, visit www.linear.com/product/LT3763.
Photo Caption: 60V Input Capable, Synchronous Buck LED Driver
Summary of Features of the LT3763:
• Accurately Control Input & Output Current
• 3,000:1 True Color PWM™ Dimming
• ±1.5% Voltage Regulation Accuracy
• ±6% Current Regulation Accuracy
• 6V to 60V Input Voltage Range
• Wide Output Range Up to 55V
• Control Pin for Thermal Control of Load Current
• Input & Output Current Monitor & Limit
• Open, Short & C/10 Fault Detection
• PWM Driver Output for LED Applications
• Thermally Enhanced 28-Lead FE Package
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, µModule products, and many other analog functions. Applications for Linear Technology’s high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
Linear Technology (UK) Limited
Tel: +44 (0)1628 477066
E-mail: uksales@linear.com
Web site: www.linear.com
Website for product information: http://www.linear.com/product/LT3763
