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productroundup Magnetically shielded power inductors Coilcraft’s XAL15xx rugged, magnetically-shielded power inductors are offered in two versions – one providing saturation current ratings up to 111A and the other offering inductance values as high as 33 μH. The XAL1510 Series offers a combination of high inductance values (up to 33 μH) and current rating as high as 39.0A, in a package that measures 15.4 x 16.4 mm and has a maximum height of 11.0 mm. For higher current applications, the XAL1580 Series offers Isat ratings up to 111A, with a 15.2 x 16.2 mm footprint and maximum height of 8.2 mm. Both series offer very low DCR - down to 0.70 mΩ for the XAL1580 - and their soft saturation characteristics make them suitable for VRM/VRD applications. They feature RoHS compliant tin-silver (96.5/3.5) over copper terminations and offer a maximum reflow temperature of 260°C. XAL1510 and XAL1580 Series feature a proprietary composite core that is not subject to thermal ageing issues. Complete article, here Warm to cool white colour-temperature tunable LEDs LED manufacturer Everlight has introduced what the company claims to be the world's first colour-temperature tunable LEDs in a simple COB (chip on board) package. After brightness dimming, tunable colour temperature is a feature that allows end users to tune the warmth of the light they receive. Typically, this feature was implemented through the use of multiple LEDs binned from cool white to warm white, behind a diffuser. With its CHI3030 27V/29W series, Everlight claims to have a very compact solution, with LEDs packaged behind concentric layers of phosphors offering different colour temperatures of white. Depending on how much of warm white or cool white you choose to light up, you can get a precise colourtemperature mix. A multichip solution, the CHI3030 is the largest such colour-temperature tunable COB LED, measuring 30 x 30 mm and drawing 29W at 27V. Added integration in ST’s latest ARM Cortex-M0 MCU STMicroelectronics’ STM32F091 ARM Cortex-M0 MCU overcomes the resource constraints imposed by similar devices positioned for cost-sensitive applications by providing large on-chip memories and up to eight USARTs that save multiplexing communication ports in applications such as in-car audio or three-phase power metering. With up to 256 kBytes of flash on-chip and a 32 kByte SRAM - enough to implement a Java stack - the STM32F091 can host applications that deliver user experiences normally associated with larger or more expensive devices. All variants, including those in economical 48-pin packages, have at least six USARTs. Three of the USARTs are able to support smartcard, LIN, IrDA, and Modbus modes. The device has a flexible power architecture that allows analogue circuitry, including the 12-bit 1.0 μsec ADC and two-channel 12-bit DAC, to be operated at up to 3.6V for maximum Complete article, here dynamic range. PC software for EMI pre-compliance testing on a €4000 budget Rigol has introduced PC-based software that automates standard EMI precompliance tests. Used with a Rigol DSA800 or 1000 spectrum analyser, the software forms an economical test system for EMC parameter measurements. The simplest form of pre-compliance measuring of radiated emissions can be performed with a Spectrum Analyser such as Rigol’s DSA815 with its bandwidth of 1.5 GHz, and near field probes for E-fields (electrical) or H-fields (magnetic). All Rigol Spectrum Analysers can be equipped with EMI filters and Quasi Peak Detectors. Option DSA800-EMI is available for the models DSA815 (1.5 GHz), DSA832 (3.2 GHz) and DSA875 (7.5 GHz) and enables the EMI Filter and the Quasi Peak Detector. By combining the right measurement instruments with the software and standard accessories, it is possible to build a flexible and reasonably priced EMI Pre-Compliance test system. The basic investment remains in an affordable price range, Rigol says, below €4,000. Complete article, here Complete article, here www.edn-europe.com EDN Europe | DECEMBER 2014 23


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