Page 48

EETE JULAUG 2014

Power inductors with shielding target DC/DC designs This power inductor family includes enhanced magnetic shielding in a miniature-sized, cost-effective solution. Bourns’ semi-shielded SRN model series combines the features of nonshielded and shielded inductors, suiting for use in DC/DC converters and industrial applications such as LED lighting, control circuits and GPS equipment. The series includes models SRN2010, SRN2012, SRN2510, SRN2512, SRN4012, SRN4026, SRN5040 and SRN6028, spanning 0.24 to 220 μH. The series also features high-rated current with Irms up to 4.7A and Isat up to 8A. Bourns designed its new power inductor family using semi-magnetic shielding technology instead of the conventional ferrite shield. Preventing uncontrolled magnetic coupling of the windings, the shielding compound is applied to the perimeter of the inductor, which envelops the winding, resulting in enhanced magnetic shielding and lower radiation emissions compared to non-shielded inductors; these power inductors have a greatly reduced footprint and are more cost-effective compared to competitively-sized conventional ferrite shield inductors. Bourns www.bourns.com 8-channel oscilloscope is tailor-made for power electronics measurement Solar power generation, electric vehicle propulsion and similar applications where high-power, variable frequency circuitry is combined with digital controls pose a specific composition of challenges to developers. Teledyne LeCroy has developed its new HDO8000 oscilloscope product line with exactly this combination in mind. The HDO8000 features eight analog input channels with 12 bits of vertical resolution, and all this at a bandwidth of 1 GHz. Oscilloscopes with a high input channel count and high resolution are also ideal for debugging systems that contain a complex mix of power electronics, clock, digital logic, serial data and analog sensor signals. Examples are deeply embedded systems in application fields such as automotive ECUs, industrial systems and even household appliances. Besides being equipped with eight input channels, the HDO8000 offers a high vertical resolution of 12 bits. This high resolution is perfected by amplifiers with a high signal-to-noise ratio and a low-noise overall system architecture, baptised HD4096 High-Definition technology. Through this technology, the oscilloscope at hand can capture and display signals of up to 1GHz with - according to LeCroy - 16 times more resolutions than other scopes. Lecroy www.teledynelecroy.com Software-based instrument puts 5 bench instruments in one box National Instruments’ VirtualBench “reshapes instrumentation” - the software-based, All-In-One device offers five essential instruments in a single unit with an innovative software experience, creating new possibilities for engineers using benchtop test equipment. Virtual- Bench is an all-in-one instrument that integrates a mixed-signal oscilloscope, function generator, digital multimeter, programmable DC power supply and digital I/O. Users interact with VirtualBench through software applications that run on PCs or iPads. The device provides the most common functionality affordably and opens up new possibilities for how engineers can use benchtop instruments. Because VirtualBench uses today’s consumer computing platforms, engineers and scientists can take advantage of the latest technologies such as multitouch displays, multicore processors, wireless connectivity and intuitive interfaces. The simplification and increased capability through software leads to more efficient circuit debugging and validation. National Instruments www.ni.com DAC drives 10mA and 1000pF on 16-channels LTC2668-16 is a 16-channel, 16-bit voltage-output digital-toanalogue converter (DAC) with SoftSpan outputs, each of which can be independently configured for one of five selectable unipolar and bipolar output ranges up to ±10V. Each rail-torail DAC output is capable of sourcing or sinking 10 mA with guaranteed load regulation and is stable driving capacitive loads as large as 1000 pF. This makes the LTC2668 suitable for driving a variety of demanding loads in applications such as optical modules, programmable logic controllers (PLCs), MRI and Xray imaging, automatic test equipment, laser etch equipment, spectrum analysers and oscilloscopes. The LTC2668 offers space-saving features in a 6 x 6-mm QFN package, nearly 50% smaller footprint than alternative 16-channel DACs and can be operated from a single 5V supply, or from dual bipolar supplies depending on the output voltage range requirement. The device includes a precision 2.5V 10 ppm/°C max reference to generate the five SoftSpan output ranges, or it can be driven with an external reference. A 16:1 high-voltage analogue multiplexer enables the user to monitor circuit integrity or perform in-circuit calibration, saving significant board real estate. The LTC2668 also supports an A/B toggle function for generating an AC bias or for applying dither to a system. Configuration of the LTC2668 is handled via an SPI-compatible serial interface which can be powered from an independent 1.8V to 5V digital supply. Linear Technology www.linear.com 48 Electronic Engineering Times Europe July/August 2014 www.electronics-eetimes.com


EETE JULAUG 2014
To see the actual publication please follow the link above