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.
Extensible CPU cores exploit IoT's vast potential
May 22, 2015
Cisco Systems has predicted that by 2020, there will be 50 billion “things” connected to the Internet up from 15 billion ...
Audi connects to Baidu, Huawei at CES Asia
New class of magnets attract energy harvesting attention
Sony raises image sensor capex...again
OneSpin Solutions takes formal verification to the App store
Why the speculations on Nokia’s map service HERE run hot
May 21, 2015
Nokia’s digital map service HERE is on the block – and a crowd of suitors are outbidding each other. But some remain at the ...
Flexible OLED display peels off the wall
Irish battery R&D facility targets advanced material development
Bosch adjusts course for future mobility requirements
- Integrating GPS into consumer products
- Controlling LED Lighting Using Triacs and Quadracs
- Automotive Designs Demand Low EMI Synchronous Buck Converters
- Smart Capacitive Design Tips
InterviewCEO interview: What's next after Tower's turn-around?
May 2015 marks the tenth anniversary of Russell Ellwanger taking over as CEO of speciality foundry Tower Semiconductor Ltd. (Migdael Haemek, Israel), which now trades as TowerJazz. And so EE Times Europe ...
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
In this month's reader offer, Analog Devices is giving away five Blackfin Low-Power Imaging Platform (BLIP) Development Systems (ADZS-BF707-BLIP2), worth 199 dollars each, for EETimes Europe's readers to win.
Targeting demanding ultra-low-power, real-time applications for image sensing and advanced audio, the development platform leverages the company’s ADSP-BF707BBCZ-4 Blackfin processor as...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.