EPN June 2012 - (Page 46)

power perspective Advanced Bus Converter ensures low CO2 emissions for telecomms Isolator Power Consumption calculator speeds access to consumption info 1.2µA, On-Off Controller manages 1.5 to 36V system power in notebooks E ricsson has announced a digital-power, advanced bus converter platform for use with board-mounted DC/DC power modules in telecomms and datacomms. The FRIDA II platform delivers low power dissipation in end-customer systems, decreases the requirement for hard cooling, and ensures low CO2 emissions. The platform is power management bus-compliant and is built around a 32bit ARM7TDMI-S microprocessor core. It offers a regulated output voltage across an operational range from 36 to 75V, together with an output response to input disturbances such as line transients. The platform is suitable for use in advanced telecomms computing architecture or remote telecomms equipment that is connected to an unstable power grid. An embedded firmware integrates a fast response-loop algorithm, which adjusts parameters to maintain the output voltage within a narrow band-gap, and remain tightly controlled over 36 to 75V. The dead-time control algorithm reduces switching power losses and eases component stress during switching. An integrated transformer layout and the use of power transistor technologies makes the platform suitable for information and communication technology applications. The integrated transformer and feedback components meet 2250V DC isolation requirements. ilicon Laboratories has introduced a web-based Isolator Power Consumption Calculator that streamlines the process of assessing system power budgets for applications requiring digital isolation. The free online utility enables developers to define basic information about their isolation set-up and then calculate the power consumption in a matter of minutes. The power consumption calculator is helpful for powersensitive and thermally constrained designs in small enclosures such as industrial process control modules or programmable logic controllers. In these and similar designs, the developer must understand the power consumption of every component in the system including the digital isolator. The user simply selects the settings that match the design such as total number of channels, VDD supply voltage and individual channel parameters, and then clicks “Get Results” to obtain detailed power and current data. Without access to such a tool, the developer would need to extrapolate power specifications from data sheets or conduct extensive calculations and then guess at some of the isolation parameters. Instead of spending hours studying data sheets, picking parameters and making judgment calls based on systems characteristics to determine the impact on the system power budget, the utility speeds up the entire process to just a few minutes. silicon laboratoriEs S inear Technology has introduced the LTC2955 pushbutton on and off controller that manages 1.5 to 36V system power via a pushbutton interface or the presence of a supply. The controller automatically turns on a system when power is applied from a primary or secondary supply, such as a wall adapter or car battery. When powered up, the controller can power down a system via pushbutton and optionally can use interrupt logic to request a system powerdown in menu-driven applications, or automatically power-down a system if the supply is removed. The controller’s operating range of 1.5 to 36V caters to single cell, multi-cell and high voltage applications, including desktop and notebook computers, consumer electronics, portable instruments and automotive electronics. The pushbutton input handles voltage swings of up to ±36V and ESD strikes up to ±25kV, and is designed to operate in noisy environments. A mode select pin enables the selection of automatic turn-on and turn-off combinations, and a 1.2µA quiescent current maximises battery run time, according to the company. The controller is available in both positive and negative enable polarities, and in a 10pin, 3x2mm dual flat, no-lead or eight-lead, thin, small outline transistor package. linEar tEchnology corporation L Ericsson 46 www.epn-online.com/search?search_keyword=47187 June 2012 – epn issue n° 06 www.epn-online.com/search?search_keyword=47807 www.epn-online.com/search?search_keyword=47514 http://www.epn-online.com/search?search_keyword=47187 http://www.epn-online.com/search?search_keyword=47807 http://www.epn-online.com/search?search_keyword=47514

Table of Contents for the Digital Edition of EPN June 2012

Cover
RS Components
Contents
Editorial Comment
International Rectifier
On the web
Agilent Technologies
New Products
Micrel
International Rectifier
Knitter-Switch
Digi-Key
Digi-Key
Rohm Semiconductor
Switches & Relays
RS Components Omron
Fujitsu
Industrial Automation
Digi-Key
Altera
New Products
Espros Photonics
Analog Devices
Test Corner
Design Application
Taiyo Yuden
New Products
Telit Communications
Taitronics
RF &Wireless
Digi-Key
Power Perspective
40th Anniversary Interview
Renewable Energy
Digi-Key
New Products
Automotive Electronics
Digi-Key
Distribution Spotlight

EPN June 2012