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EETE FEB 2015

Sensirion refines flow sensing dedicated to medical device sector Integrated sensor specialists Sensirion has continued its development of devices targeting sepcific end-markets with a click-in design for disposable infusion flow sensing in medical applications. This release represents a redesign of the company’s LD20-2000T disposable liquid flow sensor. With the goal of separating the core sensing element from other complex electronics, Sensirion has developed a two-piece, click-in design that radically improves the cost-efficiency of the solution while retaining high performance liquid flow measurement on a minimum footprint. With the reduction of the disposable part to a bare minimum, Sensirion’s flow measurement solution is suitable for medical applications such as infusion pumps and catheters. In these applications, flow rates and monitoring of failure modes are essential to patient safety and the quality of the therapy. The click-in connection between the disposable sensor element and reusable part offers a quick and easy solution for communication and mechanical integration of the sensor. The click-in design illustrates the strength of Sensirion’s technology in providing small, cost-effective sensing solutions that offer high performance at low flow rates, typical of medical applications. Sensirion www.sensirion.com Dimmable LED lighting driver design covers wide power range Fairchild has introduced the FL7734 Phase-Cut Dimmable Single-Stage LED Driver, an integrated LED controller solution for low-cost, and reliable LED lighting solutions from 5 W to 30 W. The FL7734 enables designers to achieve light quality designs with high dimmer compatibility while integrating full power factor correction (PFC) circuitry to meet power factor (PF) and total harmonic distortion (THD) requirements. The FL7734 solution uses Fairchild’s active dimmer driving technology to eliminate visible flicker or shimmer symptoms and deliver more than 90% dimmer compatibility with a variety of leading edge, trailing edge and digital dimmers from a wide range of manufacturers. The solution fully meets NEMA SSL 7A-2013 and ENERGY STAR standards and provides a programmable dimming curve and input current management flexibility. The FL7734 is a Flyback (or Buck-Boost) Pulse-Width Modulator (PWM) controller that uses an advanced Primary-Side Regulation (PSR) technique, which minimizes the external components required for implementation and therefore lowers BOM. To meet stringent LED brightness control requirements, the FL7734 uses Fairchild’s innovative TRUECURRENT PSR technology for tight constant current (CC) variation with a tolerance of less than ±1% in the wide line voltage range. The FL7734 can be used in a wide variety of lamps including GU10, candel lights, A19 and PAR30/38 bulbs, down and flat lights, and indoor and outdoor lights. Both solutions deliver a precise CC control with better than 1% variation across the entire universal line input operating range. Fairchild www.fairchild.com Silicon-Carbide MOSFET range extended at 1200V ratings ST’s SCT20N120 silicon-carbide power MOSFETs will, the company asserts, brings advanced efficiency and reliability to a broader range of energy-conscious applications such as inverters for electric/ hybrid vehicles, solar or wind power generation, high-efficiency drives, power supplies, and smart-grid equipment. The 1200V SCT20N120 extends the family, with on-resistance (RDS(ON)) better than 290 mΩ up to the 200°C maximum operating junction temperature. Switching performance is also consistent over temperature thanks to highly stable turn-off energy (Eoff) and gate charge (Qg). The resulting low conduction and switching losses, combined with ultra-low leakage current, simplify thermal management and maximise reliability. In addition to their lower energy losses, ST’s silicon-carbide MOSFETs permit switching frequencies up to three times higher than similar-rated silicon IGBTs allow. This enables designers to specify smaller external components and save size, weight, and bill-of-materials costs. The SCT20N120’s high-temperature capability helps to simplify cooling-system design in applications such as power modules for electric vehicles. SCT20N120 comes in ST’s proprietary HiP247 package with enhanced thermal efficiency. ST’ www.st.com AEC-Q100-rated, automotive grade flash storage SanDisk has introduced a range of robust, automotive grade NAND flash solutions designed for next-generation ‘connected cars’ and automotive infotainment systems. The responsiveness and capacity of flash storage technology offers the potential for car manufacturers to continue to push the boundaries of the “connected car application experience”, SanDisk says. The SanDisk Automotive portfolio of storage solutions includes an automotive grade SanDisk SD card and iNAND embedded flash drive (EFD), which are available to automotive manufacturers in capacities up to 64 GB. Using proprietary flash storage architectures, these solutions are applicable to data-intensive automotive infotainment and connected car applications, enabling maps to load fast, improving touch-screen responsiveness, and reducing potential interference from driving on uneven or rough roadways. These Automotive storage solutions are built to meet the reliability, endurance, quality and temperature demands of the automotive market, and are AEC-Q100 certified. The company points to its vertical integration and quality control, from flash memory wafer manufacturing to product assembly, test and analysis, to customer implementation. SanDisk adds that it is working closely with leading automotive chipset vendors to optimise the new automotive grade storage solutions for use with the latest application processors. SanDisk www.sandisk.com www.electronics-eetimes.com Electronic Engineering Times Europe February 2015 41


EETE FEB 2015
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