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EETE JULAUG 2014

Reference design drives Cree LEDs as standard lamp bulbs Power Integrations has released a driver reference designs for Cree LED bulbs, representing a simple, reliable drivers that will enable efficient, long-lasting PAR 30 and PAR 38 bulb formats. A total of four reference designs describe drivers for dimmable PAR 30 and PAR 38 LED light bulbs. Jointly developed by Power Integrations and Cree, the designs use Power Integrations’ LYTSwitch-4 driver ICs and CREE MT-G2 EasyWhite LEDs. DER-364 and DER-365 detail low- and high-line PAR 30 LED bulb drivers, respectively, while DER-350 and DER-396 address low- and highline PAR 38 bulbs. These reference designs are hosted at www. powerint.com/ledrivers/cree LYTSwitch-4 ICs are highly efficient and deliver accurate output current regulation in bulb and tube replacement applications and high-bay lighting. The devices simplify design and reduce cost while ensuring that lamps deliver uniform light output and perform in TRIAC-dimmable applications. LYTSwitch-4 ICs combine PFC and constant current in a single-stage topology, resulting in power factor greater than 0.95 and typical efficiencies of better than 90%. The singlestage approach also eliminates temperature-sensitive electrolytic bulk capacitors, increasing the bulbs’ reliability and lifetime. LYTSwitch-4 ICs also operate at a high switching frequency (132 kHz), enabling smaller, lower-cost magnetics to be used, while frequency jittering reduces the need for EMI filtering. Power Integrations www.powerint.com Rugged 1200V IGBTs reduce losses, offer longer lifetimes STMicroelectronics’ 1200V IGBTs use second-generation trench-gate field-stop high-speed technology to yield up to 15% lower turn-off losses and up to 30% lower turn-on losses. The saturation voltage (Vce(sat)) down to 2.1V (typical, at nominal collector current and 100°C) ensures minimal overall losses for higher-efficiency operation at switching frequencies above 20kHz. Offering increased energy efficiency and ruggedness in applications such as solar inverters, welders, uninterruptible power supplies, and Power-Factor Correction (PFC) converters, these 1200V IGBTs offer the option of an integrated very fast-recovery anti-parallel diode for optimum performance in hard-switching circuits and minimising energy losses in circuits with a freewheel diode. The IGBTs are also extremely rugged, with latch-up-free operation at up to four times the nominal current, and minimum short-circuit time of 5 μsec (at 150°C starting junction temperature). The extended maximum operating junction temperature of 175°C helps enhance service lifetime and simplify system cooling. A wide Safe Operating Area (SOA) boosts reliability in applications where high power dissipation is required. STMicroelectronics www.st.com HDMI 2.0 compliance test and debug package includes 4K coverage Tektronix has a Method of Implementation (MOI) using a fully automated compliance test and debug solution for the recently released HDMI 2.0 specification, that has been approved by the HDMI forum as the official compliance solution. The Tektronix solution provides comprehensive coverage of the required HDMI 2.0 transmitter and receiver electrical PHY tests to ensure consistent interoperability. The Tektronix HDMI 2.0 test solution reduces test set-up complexity through the use of new automation framework for Transmitter testing and a direct synthesis approach for Receiver testing that eliminates the need for additional equipment such as cable emulators and noise stressors. The successor to the widelyadopted HDMI 1.4a/b standard, HDMI 2.0 is designed to meet the bandwidth requirements of forthcoming Ultra HD or 4K televisions while using existing cabling for backward compatibility. It significantly increases bandwidth to 18 Gbps and adds such features as 32 audio channels and simultaneous delivery of video and audio streams to multiple users. As with previous HDMI versions, compliance and debug test solutions are critical to ensuring successful implementation of the specification. With the Tektronix AWG70000 arbitrary waveform generators, engineers can produce required receiver test signals and specified impairments automatically using direct synthesis methods which reduce test setup time and additional instrument cost. Tektronix www.tektronix.com Battery-free RFID resistance meter tag Farsens’ RMETER is a battery-free RFID resistance meter tag: it is a full passive RFID tag that measures the resistance value of the device connected to it with a 10Ω to 10 MΩ range. The RMETER RFID sensor tag transmits a unique identifier and the associated resistance measurement data to a commercial EPC C1G2 reader without the need of a battery on the sensor tag. This device can measure resistances in a range from 100 Ω to 500 kΩ with an accuracy of ±3%. It also offers an extended operation range from 10 Ω to 10 MΩ with an accuracy of ±7%. The RMETER has a 96 bits EPC number, a 32 bit TID and a password-protected Kill command. The tag comes in a variety of antenna designs and sizes to adapt the performance to the required application in the 860-960 MHz band. The reading distance for the battery-free thermistor tag is around 1.5m and it can be embedded in a wide variety of materials such as plastics or concrete. It can also be encapsulated in an IP67 or IP68 casing for usage in harsh environments. Evaluation kits are available. The RMETER can be used without batteries, allowing for a wide range of opportunities monitoring resistance in applications where the accessibility is restricted, or where the use of batteries is not recommended. RMETER tags offer R&D teams the opportunity of using proprietary resistance based sensors in battery-free mode. Typical resistance based sensors include thermistors, light dependent resistors (LDRs), soil moisture sensors or strain gauges amongst others. Farsens www.farsens.com www.electronics-eetimes.com Electronic Engineering Times Europe July/August2014 43


EETE JULAUG 2014
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