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Dear Sir/Madam
Nowadays the sun would shine bright enough to power electronic devices via solar cells. But the sun don´t shine always in Europe – therefore we need alternative power sources, too. A few of them you´ll find in this newsletter. Enjoy!
Wolfgang Patelay
Technical Editor, EPN
organised by 
High-Efficiency MOSFET (International Rectifier)
The IRF6643PbF is a 150V DirectFET MOSFET designed for use in isolated DC/DC converters operating from a wide range, including both 36 to 75V universal telecommunications input and 48V fixed input systems. Combining advanced packaging technology and next-generation HEXFET power MOSFET silicon, the device achieves a current rating up to 35A while providing superior thermal performance and higher efficiency in a footprint equal to that of a low-profile SO-8 package.
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24V Mini Modules (Vicor)
Vicor has confirmed the addition of nine mid-power miniature DC/DC converters to the 24VDC input family. The new models are a 100W version at 3.3Vout, and 150W versions at 5, 12, 15, 24, 28, 36, and 48Vout. A 200W model at a new standard 36V output has also been added.
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2-Wire Fuel Gauge (Maxim)
The DS2786 is a stand-alone, open-circuit-voltage based fuel gauge. The device can estimate the available capacity of rechargeable Li+ batteries using a combination of an OCV battery model and coulomb counting. It measures cell voltage in the open-circuit state and determines battery capacity based on a lookup table stored in the IC.
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60W PSUs (Meanwell)
Optimised for LED lighting purposes, the CLG-60 and PLN-60 series of 60W AC/DC enclosed type switching power supplies have active PFC function. These limited power sources comply with UL 1310 class 2, so that under any situation the output will be less than 100VA or 5A.
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SPONSOR INFINEON
Introducing the 2ED020I12-FI, a half-bridge driver IC, Infineon Technologies offers a reliable and cost effective solution for driving IGBT and MOSFET power stages up to 1200 V breakdown voltage.
It is based on the new coreless transformer technology, which is combining the advantages of inductive signal transmission and isolation with compact IC driver stage design. The driver IC able to handle dv/dt's up to 50 kV per µs. In addition the driver features a rail-to-rail OP with a gain bandwidth of 20 MHz and a separate comparator. Compared to optocouplers no degradation over time takes place.
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Understanding and Selecting Battery Charging IC Solut
One of the most critical sections of modern portable system design is battery charging. As the number of applications using Li-Ion or Li-Polymer batteries as their main power source increases, more engineers have to understand and participate in the design of battery charging circuits. With each system having different requirements for functionality, performance, form-factor and cost, the selection of a charger IC becomes a very complex process. George Paparrizos from Summit Microelectronics explains in his article in EPN the problems to consider.
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Powering Passive OLEDs in Hand-held Devices
OLEDs are an emerging technology that promises to revolutionise the display industry. Based on organic materials, OLEDs emit light when a current is passed through them. Since they are emission-based devices, different from LCDs, they can achieve a physically thin solution as no backlighting is required, saving power and providing faster response times. Joon Park from Intersil shows in his article in EPN also other performance advantages.
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Photodiode amplifier exhibits one-third the output noise of conventional transimpedance amp
A conventional 1-MO transimpedance amplifier has at least 130 nVvHz of output-noise density at room temperature. You can consider the 130 nV as the theoretical noise floor limit of the amplifier because that is the noise density of the 1-MO resistor itself. Any noise in the op amp can only make things worse. Cooling the resistor to 77.2K, the temperature of liquid nitrogen, quiets it to 65 nVvHz, provided that it survives, but is that the only option? Can you beat the 130-nV theoretical noise floorwithout cooling? Glen Brisebois from Linear Technology shows in his Design Idea in EDN one way of doing this.
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Use a CFL ballast to drive LEDs
Designers use ballast ICs, such as International Rectifier’s IR53HD420, in CFLs (compact fluorescent lamps) for heating the filaments, igniting the lamps, and supplying the lamps with current). This Design Idea by Christian Rausch shows how you can use a CFL-ballast IC for driving LEDs instead of CFLs.
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4| Market Research |
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Security Appliance Market Poised for Continued Growth
Despite trends working against it, the security appliance market will grow steadily in the next five years, reports In-Stat. This growth will occur because the key benefits these products bring to the market - namely simplicity and efficiency - will continue to be of value to many customers.
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5| Book of the Month |
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Switch-Mode Power Converters, by Keng Wu
This book introduces an innovative, highly analytical approach to symbolic, closed-form solutions for switched-mode power converter circuits. This is a highly relevant topic to power electronics students and professionals who are involved in the design and analysis of electrical power converters.
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