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.
Analysis of switch-mode power supply: inductor violations Altron Arrow
Editor's Choice Power Electronics / Power Management
Common switch-mode power supply (SMPS) design errors are discussed, and their appropriate rectification is specified, with details on complications that arise with the power stage design of DC-DC switching regulators.
Read more...Microsoft Windows IoT on ARM Altron Arrow
Computer/Embedded Technology
This expansion means that the Windows IoT ecosystem can now harness the power of ARM processors, known for their energy efficiency and versatility.
Read more...Microchip introduces ECC608 TrustMANAGER Altron Arrow
Circuit & System Protection
To increase security on IoT products and facilitate easier setup and management, Microchip Technology has added the ECC608 TrustMANAGER with Kudelski IoT keySTREAM, Software as a Service (SaaS) to its Trust Platform portfolio of devices, services and tools.
Read more...SolidRun unveils new SoM Altron Arrow
AI & ML
SolidRun and Hailo has unveiled a game-changer for engineers and AI product developers with the launch of their market-ready SoM, which packs the cutting-edge capabilities of the Hailo-15H SoC.
Read more...An evolutionary step in customisable logic Altron Arrow
DSP, Micros & Memory
Microchip Technology is offering a tailored hardware solution with the launch of its PIC16F13145 family of microcontrollers, which are outfitted with a new Configurable Logic Block module.
Read more...Compact PCB-mount SMPS RS South Africa
Power Electronics / Power Management
Traco Power’s 5W PCB-mount switch mode power supply (SMPS) offers high efficiency, and is well suited for a variety of applications in the automation, electronics, electrical and mechanical industries.
Read more...AC-DC brick PSU Conical Technologies
Power Electronics / Power Management
These PSUs have a typical efficiency of up to 92%, and a power factor value of up to 0,99. They are available in 12, 24, 28, 48 and 54 V output versions.
Read more...5 kW switching PSU range Conical Technologies
Power Electronics / Power Management
Mornsun has released a new switching power supply range, the LMF5000-25Bxx, which has a 5000 W capacity, and features universal AC input configurations.
printer friendly version