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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.
www.linear.com/product/LT3796
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Technology News
Optimized RF Silicon-On-Insulator (SOI) drives monolithic integration of multi-band radios
June 19, 2013
STMicroelectronics has developed a silicon-on-insulator (SOI) CMOS process that can integrate all the RF functions of multi-band ...
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Technology News
Fully certified FlexRay transceiver enables ESD robust in-vehicle communication
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Technology News
IoT will be next silver screen, says media exec
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Market News
Hard drives to hit billion-dollar mark by 2017 in video-surveillance applications, says IHS
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Technology News
Li-ion energy storage technology helps make smart grid for Pellworm Island even smarter
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Feature Articles
Data Fusion: the next frontier of software integration
June 19, 2013
In the last few years, the functionality of our mobile devices has come so far that consumers now treat them more like personal ...
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Business News
“Prototype to Production”, the new Digi-Key trademark
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Business News
STMicro signs memory design agreement with Rambus
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Technology News
X-FAB optimizes 180nm process for portable analog applications
Technical papers
Filter Wizard
Check out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFER
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The SoCKIT evaluation kit is Arrow's latest development tool, featuring an Altera Cyclone V SoC with a dual-core ARM Cortex-A9 MPCore processor integrated within its 28nm FPGA fabric.
Altera SoCs allow embedded system developers to differentiate their end product with customized hardware and software, and extend the product lifecycle through hardware and software updates in the field. This month, Arrow Electronics is giving away five SoCKIT evaluation kits featuring Altera’s ARM-Based SoCs, worth €249 each, together with the free entrance to one of Arrow’s SoC workshops organized throughout Europe.
And the winners are...
In our previous reader offer, Freescale Semiconductor was giving away five IMX6Q, Sabre-lite kits, worth £128.06 each.
Lucky winners include Mr. X. Salada Sole from the UK, Mrs A. Peric from Germany, Mr Z. Janosy from Hungary, Mr D. Gacina from Croatia and Mr B. Boris from France. All should be receiving their packages soon. Let's wish them some interesting findings with their projects.
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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.
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