Linear Technology recently rolled out the LT3797, a triple-output DC/DC controller designed to drive three independent channels of LEDs.
Its fixed-frequency, current-mode architecture delivers constant, accurately regulated LED current over a wide range of supply and output voltages.
The chip’s 2,5 V to 40 V input voltage range with transient ride-through to 60 V makes it ideal for automotive applications, which must operate through cold crank, stop/start and load dump scenarios, as well as for a wide range of industrial applications.
Each of the LT3797’s channels can drive a wide range of LED power in either step-up, step-down or SEPIC topologies. In a boost configuration, it powers three channels of up to 90 V with LED currents in excess of 1 A, delivering over 250 W of power from a nominal 12 V input with efficiencies as high as 93%.
Each of the three channels is operated by an independent PWM signal, enabling them to be dimmed to ratios as high as 3000:1. Each channel also offers both robust open-LED and short-circuit protection in boost mode. A frequency adjust pin enables the user to program the frequency between 100 kHz and 1 MHz to optimise efficiency while minimising external component size.
The device is designed so that each channel can use the most suitable configuration to drive its LED string, whether step-up, step-down, SEPIC or a combination of these. Its high-side current sense enables each channel to be used in the same or different configurations while rail-to-rail current sense enables outputs from 0 V to 100 V, offering a wide range of design flexibility. Other features include over-voltage and under-voltage lockout, 20:1 analog diming via the CTRL pin, and external synchronisation.
The device’s thermally enhanced 7 x 8 mm QFN package provides a highly compact solution footprint for 20 W to 250 W LED applications. A special version (LT3797EUKG) is tested and guaranteed to operate with a -40°C to 125°C operating junction temperature.
Finding value for money with your IoT battery Uniross Batteries
Power Electronics / Power Management
Designing an IoT application involves a lot of choices. Designers are looking for performance and quality, but need to balance those alongside a low Total Cost of Ownership.
Read more...Powering the IoT Uniross Batteries
Power Electronics / Power Management
Choosing the right battery is not simply a technical detail, but a defining factor in the longevity and cost-effectiveness of any IoT deployment.
Read more...Cost-effective microcontroller series Altron Arrow
DSP, Micros & Memory
The STM32C5 series from STMicroelectronics delivers an excellent balance of performance, efficiency, and affordability for embedded designs that require more capability without increasing bill of materials cost.
Read more...Understanding two key tools for cleaner serial data Altron Arrow
Editor's Choice Analogue, Mixed Signal, LSI
Understanding how pre-emphasis and equalisation works, and when to use one over the other, is critical when designing reliable high-speed systems.
Read more...The move to DC infrastructure IOT Electronics
Power Electronics / Power Management
The shift toward direct current infrastructure in data centres is accelerating as operators pursue higher efficiency, improved reliability, and stronger alignment with renewable energy goals.
Read more...Power inductor for automotive applications Würth Elektronik eiSos
Power Electronics / Power Management
The WE-MXGA inductor features RDC values up to 25% lower and a saturation current up to 47% higher compared to other components currently available on the market.
Read more...High-performance DC-DC converter Conical Technologies
Power Electronics / Power Management
With a wide 9 - 40 V DC input range, the Claf Power DWHB400-F24xxN series is a high-performance DC-DC converter family ideally suited for 12 V and 24 V battery-based systems including vehicles, off-grid installations, and distributed power architectures.
Read more...DC-DC converters for next-generation IoT iCorp Technologies
Power Electronics / Power Management
AIPUPOWER’s K78XXJT-500R3 and K78XXJT-500R3-LB give designers a compact, high-efficiency power option for battery-powered and space-constrained systems, combining up to 96% efficiency with no-load input current as low as 0,2 mA.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version