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DAVE, if you get to these before I do, start at...(Electronics Weekly (UK) Via Acquire Media NewsEdge) DAVE, if you get to these before I do, start at page 18 and work towards the back, says Richard. :o) 17aug11micrel.jpg Micrel has introduced two linear regulators designed for noise-sensitive industrial applications with an input operating voltage range up to 120Vdc. The MIC5281 and MIC5282 regulators supply output currents of up to 25mA and 50mA respectively. The devices offer ±3% initial voltage accuracy, supply rejection ratio greater than 90dB. Quiescent current is 6µA. The devices are offered in both fixed output voltage (3.3V/5.0V) and adjustable output voltage (1.27V to 5.5V) options. The regulators operate over the -40 to +125ºC temperature range and are available in lead-free, RoHS compliant 8-Pin ePad MSOP and 8-Pin MSOP package options. www.micrel.com Texas Instruments has introduced a synchronous 50mA, 60V step-down regulator which integrates both the high-side and low-side power mosfets. The TPS54062 converter can withstand high-voltage transients up to 65V, while maintaining high efficiency across the load. For higher voltage transient protection at 50mA, there is also the TPS7A4001 50mA, 100V LDO, which a settling time of less than 500ns for a 50V transient event. Operating temperature range is -40° to 150°C, efficiency 90% at 24Vin, 5Vout at 150 kHz. The TPS54062 can be synchronised to a clock via fixed frequency. The chip has 89µA operating current with a shutdown current of only 1.7µA. Switching frequency range is 100 to 400kHz and the device is available in an 8-pin, 3x5mm MSOP PowerPad package. For samples, PSpice simulation model and development kit visit: www.ti.com/tps54062-preu. 17aug11martek.jpg Martek Power is offering the Powertron VER series of low-cost, medium power, single output DC-DC converters. Offering 90% efficiency, there are two versions designed to comply fully with the latest rail specifications and norms for protection and EMC. The enhanced version is intended for those applications needing compliance with class S2 supply interruptions where a 10ms hold-up time is required. All nominal vehicle battery voltages are catered for by just two models, and the enhanced version adds active inrush current limiting and "good" output indication. The VER series DC-DC converters have a footprint of 110x70x40mm for the standard version. The low voltage input version covers 24 and 36V nominal voltages, whilst the high voltage version is suitable for 72, 96 and 110V nominals. Output voltages can be specified from 12V to 48Vdc and maximum output power is 100W. All models are fully compliant with rail standards including EN50155 and EN50121.3.2 An optional ventilated steel cover is available giving protection to IP20. Operating temperature range is -40ºC to +70ºC with no derating. www.martekpower.com 17aug11ir International Rectifier has launched a family of current-sensing high-side power switches for automotive applications. Called AUIR331x, devices are available for up to 30A continuous (90A peak) and are aimed at glow-plug controls, auxiliary positive temperature coefficient heaters, engine cooling fan drivers and interior fan controllers. "The current-sensing accuracy, particularly at low current, enables monitoring of load current in order to provide additional data to the microcontroller for diagnostic applications," said IR. "Typical examples include open-load detection, early warning of overload conditions or stall motor condition." There are two devices available at the top (30A/90A) rating. AUIR3313 has conventional timing and AUIR3316 is slower switching to help minimise EMC. As well as current-sense feedback, the family has over-temperature and over-current shutdown which operates repetitively under short-circuit conditions "according to the latest AEC Q100-012 standard", said IR. "In many applications, additional protection devices such as fuses can be eliminated." Over-current shutdown is resistor-programmable between 10 and 90A. Under reverse-battery conditions, an integrated protection circuit turns the main mosfet switch on, helping to relieve the intrinsic body diode to reduce heating. "Additional features such as ESD protection and an active clamp circuit guarantee safe operation and protection under harsh automotive operating conditions," claimed the firm. The chip is entirely +ve rail referenced and has no 0V or ground connection. Instead, current to drive the logic and n-type mosfet charge pump is sunk through the control input which is pulled to ground to activate the chip. There are two lesser version in the family - 3314 is rated for 6-58A shut down and 15 for 3-30A shut down. All come in TO-200 packages, or D2PAK if an S suffix is added. www.irf.com 17aug11powersolve.jpg Powersolve is offering the TEP 200WI range of high power DC-DC converter modules that provide up to 216W output power from a sealed, shielded metal case measuring just 61x48.2x12.7mm. They are designed as standard for chassis mount and an optional screw terminal adaptor is also available to make connection simple. DIN -rail mounting is also an option. Manufactured by Tracopower, the converters come as standard with an aluminium baseplate which, when combined with a 91% efficiency level, allows for operation up to 75ºC with convection cooling. Input voltages can range from 9 to 75Vdc and, with output voltages from 3.3 to 48Vdc, the modules are suitable for a wide range of industrial applications. Features also include soft start, output voltage trimming and reverse input protection. www.powersolve.co.uk Torex's The XC9516 is a triple output power supply mainly aimed at 11-14in TFT-LCD panels. It can operate with input voltages between 2.5V and 5.5V. It contains a non-synchronous step-up DC/DC converter (with integrated 1A N-channel driver transistor) whose output voltage can be set externally between 5.5V and 19V. There is a positive charge pump (doubler), with regulated output and a negative charge pump (inverter), with regulated output. The XC9516 includes an internal voltage regulator, whose main purpose is to keep the on-resistance of the integrated driver transistor as small as possible when a low input voltage is applied. Its switching frequency can be adjusted between 300kHz and 1.5MHz by connecting a resistance to its ROSC pin. Protection circuits comprises thermal shutdown, UVLO (undervoltage lockout) with hysteresis, overvoltage protection (step-up DC/DC only) and short-circuit protection (one for each of the three outputs). The device is packaged in a 4.0x4.0x0.75mm QFN-20. www.torex-europe.com/products/range/332 17aug11unipower.jpg Unipower has a range of multiple output switchers which can provide up to four customer specified outputs, with an option to isolate V4, voltages ranging from 1.5Vdc to 48Vdc as the application requires. All output combinations are pre-approved to cUL & TUV to 60950-1, 2nd edition, EN60601-1, CB. This series provides a full 120W of output with forced air, 90W convection and up to 180W with fan-cover assembly. Product is available in AC or DC input versions, DC versions can be 12, 24 or 48Vdc input. 85 to 350Vdc input is also available. 400Hz operation models can be provided with this versatile switcher. Standard models of the AM120 Series power supplies are available from stock and modified units can be made available normally in five to 20 days, depending on customer requirements. Email: [email protected] 17aug11linear.jpg Linear Technology has introduced an inductorless supercapacitor charger with backup PowerPath controller for Li-ion or other low-voltage system rails in applications that require short term backup power. The device employs a low-noise dual mode (1x/2x) charge-pump architecture with constant input current to charge two supercapacitors in series from a 2.5V to 5.5V input supply to a programmable capacitor charge voltage between 2.5V and 5.3V. Charge current is resistor-programmable up to 150mA. The device's automatic cell balancing and voltage clamping features maintain equal voltages on both cells without requiring balancing resistors. This protects each supercapacitor from overvoltage damage that could otherwise be caused by mismatches in cell capacitance or leakage, while minimizing current drain on the capacitors. The LTC3226 has two modes of operation: normal and backup. Operating mode is determined by a programmable power fail (PFI) comparator. In normal mode (PFI high), power flows from VIN to VOUT through a low loss external FET ideal diode, and the charge pump stays on to top off the supercapacitor stack. In backup mode (PFI low), the charge pump is turned off and the internal LDO is turned on to supply the VOUT load current from the stored supercapacitor charge while the external ideal diode prevents reverse current flow into VIN. Up to 2A of backup current may be provided from the supercapacitor through the internal LDO. The LTC3226 operates with a very low 55µA quiescent current when the output voltage is in regulation. www.linear.com/product/LTC3226 17aug11analog.jpg Analog Devices has a 20V, 3A dual output DC-to-DC regulator with a conversion efficiency of greater than 93%, according to the supplier. TheADP2323 regulator has an input voltage supply range of 4.5V to 20V and an output range as low as 0.6V up to 18V at 1.5% voltage accuracy. The regulator is designed to be configured to synchronise in an evenly phase-shifted topology or for dual-output (2 x 3A) or single interleaved output (up to 6A). There is a tracking capability between supplies and includes precision-enable input, voltage tracking input and POWER-GOOD features that allow a simple and reliable start-up sequence. The ADP2323's switching frequency can be programmed between 250kHz to 1.2MHz or synchronised to an external clock to minimise interference in multi-rail applications. Both output channels run 180 degrees out of phase and can be synchronised to eliminate beat frequencies between regulators to minimise system noise. The regulator operates from input voltages of 4.5V to 20V and the output voltage can be as low as 0.6V. The two PWM channels can be configured to deliver dual 3A outputs or a parallel-to-single 6A output. Designed for high efficiency for multi-rail applications, the ADP2323 operates over the -40 °C to +125 °C junction temperature range and is available in a compact 5x5mm QFN-32 lead package. www.analog.com/ADP2323 Power-One has a modular AC-DC power supply family which offers up to 1500W of power in the form of a six-slot chassis (LPM615 model) or up to 900W of power in a four-slot chassis (LPM409 model). The input range is 85-264Vac with power factor correction (PFC). There is one to six fully-isolated outputs depending on model, a low 1U height (40mm) and zero-load operation. The four available output modules can be fitted into the four or six-slot chassis, providing for exact voltage and current requirements. The i-PWER LPM series has a typical power density of 17.6W/in3. Each output module is widely adjustable, offering continuous output coverage in ranges from 2V to 51V (2-5V, 5-15V, 15-32V and 15-51V respectively). Modules may also be connected in series or parallel for higher voltages or higher currents, while the screw thread and terminal design of the LPM Series ensures the fit-and forget nature of this reliable product. www.power-one.com/corporate/contact/power A range of 5W USB wall mount AC-DC adapters from Emerson Network Power have a design which eliminates the need for dedicated power cable attachments and connectors. Instead, one side of the adapter plugs into the ac supply socket, and the dc output is made available via a standard USB Type A receptacle on the opposite side. The DCH5 series adapters have a universal 100 to 240Vac input, enabling them to be used worldwide, and generate a regulated 5Vdc output capable of delivering up to 1A continuously. The adapters operate in constant voltage/constant current mode, and are intended for powering any USB peripheral device rated at 5 W or less requiring an external power source. There are four DCH5 models, featuring different ac input plugs for use in the US, Europe, UK and Australia. Each model weighs 2.3oz (66g). They comply with the Tier 2 Energy-related Products (ErP) requirements of Ecodesign Directive 2009/125/EC, which sets stringent standards for efficiency and standby energy consumption. The adapters have no minimum load requirement and a very low no-load power consumption of less than 300mW. Emerson Network Power DCH5 series power adapters have an extremely low safety ground leakage current of 20µA maximum. Comprehensive protection against fault conditions includes latching overvoltage, output short-circuit with auto recover, and overload protection to less than 1.5A. www.EmersonNetworkPower.com SynQor has a range of military commercial-off-the-shelf (COTS) dc-dc converters designed to provide isolated dc power for electronics such as power amplifiers, jammers, and systems requiring high power bus voltages. These converters are based on a synchronous rectifier based technology which the supplier claims can offer efficiencies of up to 95% at full load. The 500W converter is offered in a standard half-brick package (2.49x2.39x0.51in). The military COTS Zeta series of converters are offered encased for use in harsh environments and can provide full output power at case temperatures between -55°C and 100°C. Input voltage family ranges have been tailored to MIL-STD-704 and MIL-STD-1275 and include 28 (16V to 40V), 28V (9V to 40V), and 28VE (9V to 70V) with many output voltage offerings between 5V and 50V. The optional built-in current sharing feature allows for easy paralleling of modules for applications requiring more than 1kW of power or module redundancy with limited external components. Features include remote on/off control, very wide +10% to -50% output voltage trim range, remote output voltage sense, input under-voltage lockout, output over-voltage protection, and optional current share. The MCOTS half-brick Zeta series is designed for 2250Vdc and 30MO input-to-output isolation, are 6/6 RoHS compliant, and are rated with MTBF values in excess of 1.3M hours at 70°C (MIL-217). www.synqor.com Vicor's IBC054 series of VI BRICK bus converters are offered as drop-in upgrades for industry standard 5:1 and 4:1 converters. These eighth and quarter bricks achieve up to 98% efficiency from a 36V to 60V input voltage range at power levels from 300W up to 750W, with 2,250Vdc isolation from input to output. This series of bus converters offers a transient surge capability of 75Vin for 100ms which is applicable for telecoms and power-over-Ethernet applications. The supplier offers an online cross-reference selection tool to identify the most appropriate upgrade options. www.vicorpower.com TDK-Lambda UK has developed a series of power supplies that comply with the energy saving requirements of Energy Star and the ErP (Energy related Products) Directive. Designed for use in light industrial equipment and front-end equipment for broadcast and communications applications, the 250W GWS series AC-DC power supply has a 105x198mm footprint and 1U height. Convection cooled and rated at 250W, the power supply is offered in four models with nominal outputs of 12V (21A), 24V (10.5A), 36V (7A) and 48V (5.3A). Outputs are user adjusted by up to 20% depending on model type - and the 24V and 36V models have a peak power rating of 300W. With a flat efficiency curve averaging at 93%, from 25 to 100% load, the supplies can be operated at full load from -25 to 50°C ambient temperature and up to +70°C with suitable de-rating. The supplies have overvoltage, over-temperature and over-current protection (constant current mode for 24V, 36V and 48V models, 12V hiccup mode). Models also feature less than 0.5W no-load input power, 5V/0.3A standby output, remote on/off, DC GOOD signal and a voltage programming function as standard. www.uk.tdk-lambda.com 17aug11amp.jpg Amplifier Technology has developed a range of communications amplifiers for the broadcast market - the 8800 and 8801 COFDM linear amplifiers, which are nominally rated at 1W and 5W respectively. Both amplifiers operate at between 2.0 GHz and 2.8 GHz for video at QPSK, 16QAM and 64QAM modulation schemes, which makes them suitable for outside broadcast applications, for example for use with wireless cameras. The 1W amplifier, model 8800, measures 110x60mm, while the 5W amplifier, model 8801, is slightly larger, at 155x115mm. Both are easily portable via a 12V supply. Test results show good linearity across the band. www.amplifiertechnology.com Capacitors go system-in-package Kemit is building ceramic capacitors into metallised polyester film capacitors to allow both low and high frequency filtering, claiming it to be a first. They have been dubbed the F5D Series. "F5D combines a self-healing film capacitor, capable of withstanding high voltage peaks for low frequency filtering, and a multilayer ceramic capacitor of low capacitance for high frequency filtering," said Kemit R&D engineer Franz Wurmser. "Automotive motor applications such as windshield wipers, cooling fans and seat positioning can all benefit from this single component." The single device can eliminate the need for a filter PCB, added CTO Dr Philip Lessner. The capacitors are AEC-Q200 and ISO 7637-2, rated between 63 and 100V, and offer 100nF to 2.2µF for the film capacitor and 10pF to 100nF for the parallel ceramic capacitor. Temperature range is -55 to 125°C. www.kemet.com Kemtron has launched a flame retardant, low smoke, low toxicity EMC shielding gasket. The material is a nickel coated graphite loaded into silicone elastomers, product code SNG-FR, the gasket provided a highly electrically conductive path between mating flanges of an electronics equipment enclosure giving a high level of RFI/EMI shielding. The material can be supplied as an extruded strip in various profiles, "O" rings or flat die cut gaskets. Tested and approved to the international standard UL94V-0. Also tested for smoke density to BS 6853:1999: Annex D.8.3. www.kemtron.co.uk 03aug11MicrochipSmartMeter Microchip has tied up with Kalkitech to provide a DLMS stack for 16-bit PICs. DLMS (device language message specification) protocol aims to provide interoperability among metering systems for electricity, gas, heat and water for residential, transmission and distribution applications. It works over links including RS-232, RS-485, PSTN, GSM, GPRS, IPv4, PPP and PLC, with secure data access via AES 128 encryption, said Microchip. "To make the DLMS certification process faster and easier, the software stack has been tested and verified by the DLMS User Association and operates on all of our 16bit PIC microcontrollers and dsPIC digital signal controllers," claimed the firm. "Additionally, the stack has been developed to ensure integration with our communication protocol stacks, including TCP/IP, ZigBee and PLC. For European applications, the stack provides support for the IEC 62056-21 Mode E implementation." Available now: Free DLMS Evaluation Library; DLMS-lite Stack (SW500160); DLMS Stack (SW500162); DLMS Explorer (SW500164) - Windows-based DLMS/COSEM client application. www.microchip.com 03aug11Meggitt At 0.2g, this is Meggitt's smallest piezoelectric accelerometer. Dubbed the 25A, it features shear mode construction and integral electronics which convert high-impedance input into a low-impedance voltage output through the same cable that supplies the required 4mA constant current power. "Its lightweight design effectively reduces unwanted mass loading effects," said the firm. "It is well-suited for measuring overall vibration levels of scaled models and smaller electronic components within aerospace, automotive, electronic products, and in-laboratory testing applications, as well as biomedical research." The unit comes attached to two thin (34AWG) field-reparable output leads, allowing for immediate field use. "If required, a new assembly lead may also be reinstalled at the factory," said Meggitt. A heavier gauge (28AWG) extension cable is also provided and an optional tri-axial mounting block is available for three-axis measurement. Signal ground is isolated from the its mounting surface by a hard anodised surface and the units are adhesive mounted, and demountable using a special tool, which is supplied. www.meggittsensingsystems.com 20jul11aspen.jpg Aspen Electronics has a series of three GPS simulators. The Pendulum GSG-L1 and GSG-55 generate one and sixteen GPS signals respectively, and are aimed at a wide range of R&D, product development and production test applications. The single channel GSG-L1 is intended for simple, fast, go/no-go factory tests of GPS-receivers integrated into other devices such as mobile phones, navigation devices and tracking systems. Sensitivity of the GPS receiver is tested via the programmable output level. The 16-channel, GSG-55 has the additional capability of performing accurate testing of navigation parameters as a minimum of 16 channels is required for positioning data. The GSG-55 can also be used to simulate user movements and is suited for both R&D and production test. The benchtop unit is portable and requires no external PC control. The front display and control panel of the GSG-55 can be used to edit position, time, trajectory, events (such as signal outtakes), signal data content (ephemeris/almanac), etc. www.aspen-electronics.com (c) 2011 Reed Business Information - UK. All Rights Reserved. |