100-V high-side current sense DC/DC controller helps to regulate a constant-current or constant-voltage for HBLEDs
April 18, 2012 // Paul Buckley
Linear Technology has released a 100 V, high-side current sense DC/DC controller designed to regulate a constant-current or constant-voltage that is ideal for driving high brightness (HB) LEDs.
The LT3796’s 6 V to 100 V input voltage range supports a wide variety of applications, including automotive, industrial and architectural lighting. The device uses an external N-channel MOSFET and can drive up to 85 V of white LEDs from a nominal 12 V input, delivering in excess of 50 Watts.
The LT3796 is ideal for charging batteries or supercaps at constant current and voltage. The LT3796 incorporates a high-side current sense, enabling its use in boost, buck, buck-boost or SEPIC and flyback topologies. Additionally, it offers both input and output current limiting and monitoring for added reliability and design flexibility.
The controller can deliver efficiencies of over 94% in boost mode, minimizing the need for external heat sinking. A frequency adjust pin enables the user to program the frequency between 100 kHz and 1 MHz, optimizing efficiency while minimizing external component size and cost. Combined with a thermally enhanced TSSOP-28 package, the LT3796 offers a highly compact HB LED driver or charger solution.
The LT3796 uses True Color PWM dimming, which delivers constant LED color with dimming ranges of up to 3,000:1. For less demanding dimming requirements, the CTRL pin can be used to offer a 10:1 analog dimming range. Its fixed frequency, current-mode architecture ensures stable operation over a wide range of supply and output voltages.
Robust open and short-circuit protection maximize overall system reliability, whereas C/10 detection optimizes both battery and supercap charging designs. Additional features include frequency synchronization, programmable UVLO and a programmable fault restart timer.
Conspiracy alleged over Rousset wafer fab closure
March 07, 2014
A class action lawsuit has been filed in Federal Court in New York alleging that Atmel Corp. (San Jose, Calif.) conspired ...
Europe loses PV market lead to Asia in 2013
Driverless car sharing concept focuses on digital comfort
Automated SSL test system authenticates LED technology performance
Paper-thin ultracapacitor aims to boost Li-ion battery performance
Apple set to transform sapphire wafer market
March 07, 2014
The sapphire industry ended an 18 month period of depressed pricing and achieved $936 million in revenue for wafer products ...
FTDI reveals streaming instruction behind new 32bit architecture
AMD taps UK tool for video verification
UHF RFID the radio technology of choice for Industry 4.0
- DSM presents: Select the best plastic for DDR4
- Wireless Sensor Network Challenges and Solutions
- Putting FPGAs to Work in Software Radio Systems Handbook
- Real-Time Spectrum Analysis for Troubleshooting 802.11n/ac WLAN Devices
InterviewWi-Fi is open for business, which is good news for mobile subscribers
Following the news that Netgear has built a Facebook-linked amenity Wi-Fi option into its routers, enabling businesses to offer free Wi-Fi in return for liking the company Facebook page, David Nowicki, ...
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, Freescale is giving away ten RIoTboards, worth 74 dollars each, for EETimes Europe's readers to win.
Designed to run Android operating systems efficiently or to run under Linux, the board is based on the Freescale i.MX 6Solo processor; using the ARM Cortex-A9 architecture.
And the winner is...
In our previous reader offer, Crystal Display was giving...Read more
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.