60 V synchronous buck-boost LED driver delivers over 100 W of LED power
March 13, 2012 // Christoph Hammerschmidt
Linear Technology announces the LT3791, a synchronous buck-boost DC/DC LED driver and voltage controller, which can deliver over 100 W of LED power. Its 4.7 V to 60 V 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 0 V to 60 V, enabling the LT3791 to drive a wide range of LEDs in a single string. Its internal 4-switch buck-boost controller operates from input voltages above, below or equal to the output voltage, ideal for applications such as automotive, where the input voltage can vary dramatically during stop/start, cold crank and load dump scenarios. Transitions between buck, pass-through and boost operating modes are seamless, offering a well-regulated output even with wide variations of supply voltage. The LT3791's unique design utilizes three control loops to monitor input current, LED current and output voltage to deliver optimal performance and reliability.
The LT3791 uses four external switching MOSFETs and delivers from 5 W to over 100 W of continuous LED power with efficiencies up to 98.5%. LED current accuracy of ±6% ensures constant lighting while ±2% output voltage accuracy enables the converter to operate as a constant voltage source. The LT3791 utilizes either analog or PWM dimming as required by the application. Furthermore, its switching frequency can be programmed between 200 kHz and 700 kHz or synchronized to an external clock. Additional features include output disconnect, input and output current monitors, open and shorted LED detection and integrated fault protection.
Machine learning for every app
October 02, 2015
Startup company Dato wants to make a splash in the consumer market by making it easier for developers to integrate machine-learning ...
Cyber threats against cars are here to stay, experts say
BAIC launches R&D centre in Aachen
NXP-Freescale: merger of 'compatible' giants on track
TSMC turns logic FinFET into ReRAM
Invisibility cloak focuses on enhancing solar cell efficiency
October 01, 2015
Scientists of Karlsruhe Institute of Technology (KIT) have discovered an unconventional approach to increasing the efficiency ...
Measuring the most stable light source in the world
3D memory chips may beat 3D hybrid memory cube
Are mushrooms the answer to lithium-ion battery degradation?
- Determine Balancing Current for the LTC3305 Lead-Acid Battery Balancer
- 3 Ways to Simplify Medical Device Testing
- Thread Networking Protocol Simplifies Connecting “Things” in the Home and Beyond
- High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC
InterviewCEO interview: Ambiq sees broader options for low voltage
Mike Noonen, recently appointed interim CEO at microcontroller startup Ambiq Micro, discusses the focus and opportunities for this pioneering company designing circuits that can operate below the threshold ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, LabNation is giving away three of its SmartScope open source USB oscilloscopes, worth 229 Euros each, for EETimes Europe's readers to win.
Successfully funded through Kickstarter last year, the SmartScope is claimed to be the world's first test equipment designed to run on multiple operating systems and platforms such as smartphones, tablets and PCs. It is powered directly from... MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.