Power Electronics http://powerelectronics.com/rss.xml en Digital Compensation Simplifies Design, Improves Performance Of Point-of-Load Module http://powerelectronics.com/dc-dc-converters/digital-compensation-simplifies-design-improves-performance-point-load-module <div class="field-deck"> CUI’s NDM3ZS-60 dc-to-dc point of load module incorporates an advanced digital control scheme that maintains stable switching performance, eliminating the need for built-in compensation to account for variations in temperature and manufacturing. </div> <div class="node-body article-body"><div></div>CUI’s NDM3ZS-60 dc-to-dc point of load module incorporates an advanced digital control scheme that maintains stable switching performance, eliminating the need for built-in compensation to account for variations in temperature and manufacturing.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/dc-dc-converters/digital-compensation-simplifies-design-improves-performance-point-load-module" target="_blank">read more</a></p> http://powerelectronics.com/dc-dc-converters/digital-compensation-simplifies-design-improves-performance-point-load-module#comments DC-DC Converters Wed, 16 Apr 2014 17:00:00 +0000 32651 at http://powerelectronics.com By 2024 Over 50% of the Li-ion Battery Business will be for Hybrid and Pure Electric Cars http://powerelectronics.com/trends-analysis/2024-over-50-li-ion-battery-business-will-be-hybrid-and-pure-electric-cars <div class="node-body article-body"><div></div>According to a report from IDTechEx, the lithium-ion battery business is growing rapidly to many tens of billions of dollars yearly, thanks to billions of dollars continuing to be invested in the industry. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/trends-analysis/2024-over-50-li-ion-battery-business-will-be-hybrid-and-pure-electric-cars" target="_blank">read more</a></p> http://powerelectronics.com/trends-analysis/2024-over-50-li-ion-battery-business-will-be-hybrid-and-pure-electric-cars#comments Trends & Analysis Wed, 16 Apr 2014 15:38:00 +0000 33001 at http://powerelectronics.com Eaton and University of Pittsburgh Celebrate Opening of New Power Engineering Lab http://powerelectronics.com/industry/eaton-and-university-pittsburgh-celebrate-opening-new-power-engineering-lab <div class="node-body article-body"><div></div>Power management company Eaton and the University of Pittsburgh today unveiled the Swanson School of Engineering's new Electric Power Systems Lab with a ribbon-cutting ceremony at Pitt's Benedum Hall of Engineering. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/industry/eaton-and-university-pittsburgh-celebrate-opening-new-power-engineering-lab" target="_blank">read more</a></p> http://powerelectronics.com/industry/eaton-and-university-pittsburgh-celebrate-opening-new-power-engineering-lab#comments Industry Wed, 16 Apr 2014 15:35:00 +0000 32991 at http://powerelectronics.com Thermally & Electrically Conductive Adhesive (TECA) Film http://powerelectronics.com/power-electronics-systems/thermally-electrically-conductive-adhesive-teca-film <div class="node-body article-body"><div></div>Rogers Corporation Advanced Circuit Materials Division launched COOLSPAN®, providing reliable high temperature performance. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/power-electronics-systems/thermally-electrically-conductive-adhesive-teca-film" target="_blank">read more</a></p> http://powerelectronics.com/power-electronics-systems/thermally-electrically-conductive-adhesive-teca-film#comments Products Power Electronics Systems Wed, 16 Apr 2014 15:33:00 +0000 32981 at http://powerelectronics.com Op Amp Delivers High Precision Measurements for Industrial Applications http://powerelectronics.com/power-management/op-amp-delivers-high-precision-measurements-industrial-applications <div class="node-body article-body"><div></div>Texas Instruments introduced the industry's first 36-V rail-to-rail input and output (RRIO) operational amplifier (op amp) to achieve precision offset voltage and drift without using auto-zero techniques. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/power-management/op-amp-delivers-high-precision-measurements-industrial-applications" target="_blank">read more</a></p> http://powerelectronics.com/power-management/op-amp-delivers-high-precision-measurements-industrial-applications#comments Products Power Management Wed, 16 Apr 2014 15:31:00 +0000 32971 at http://powerelectronics.com SMD Power Inductor Series Featuring a Homogeneous, Low Loss, Pressed Iron Powder Core Construction http://powerelectronics.com/passive-components/smd-power-inductor-series-featuring-homogeneous-low-loss-pressed-iron-powder-core <div class="node-body article-body"><div></div>AVX Corp. has introduced the new LMIP Series SMD power inductors. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/passive-components/smd-power-inductor-series-featuring-homogeneous-low-loss-pressed-iron-powder-core" target="_blank">read more</a></p> http://powerelectronics.com/passive-components/smd-power-inductor-series-featuring-homogeneous-low-loss-pressed-iron-powder-core#comments Products Passive Components Wed, 16 Apr 2014 15:28:00 +0000 32961 at http://powerelectronics.com Miniature, 3.3 V Linear Hall-Effect Sensor IC http://powerelectronics.com/pmics/miniature-33-v-linear-hall-effect-sensor-ic <div class="node-body article-body"><div></div>Allegro MicroSystems, LLC introduces a new linear, Hall-effect sensor IC specifically designed for applications that require medium accuracy in a very small package. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/pmics/miniature-33-v-linear-hall-effect-sensor-ic" target="_blank">read more</a></p> http://powerelectronics.com/pmics/miniature-33-v-linear-hall-effect-sensor-ic#comments Products PMICs Wed, 16 Apr 2014 15:19:00 +0000 32951 at http://powerelectronics.com ETL-Listed Modular LED Street Lights http://powerelectronics.com/lighting-systems/etl-listed-modular-led-street-lights <div class="node-body article-body"><div></div>LEDtronics introduces a series of dimmable modular LED streetlights that are ETL listed and RoHS compliant. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/lighting-systems/etl-listed-modular-led-street-lights" target="_blank">read more</a></p> http://powerelectronics.com/lighting-systems/etl-listed-modular-led-street-lights#comments Products Lighting Systems Wed, 16 Apr 2014 03:30:00 +0000 32941 at http://powerelectronics.com Compensating The RHPZ In The CCM Boost Converter: The Analytical Way http://powerelectronics.com/datasheet/compensating-rhpz-ccm-boost-converter-analytical-way <div class="field-image-promo"> <a href="/datasheet/compensating-rhpz-ccm-boost-converter-analytical-way" class="imagecache imagecache-med_crop imagecache-linked imagecache-med_crop_linked"><img alt="" src="http://powerelectronics.com/site-files/powerelectronics.com/files/imagecache/med_crop/datasheets/thumbnails/basso3.jpg" title="" height="200" width="355" class="imagecache imagecache-med_crop" /></a> </div> <div class="node-body datasheet-body"><div></div>The RHPZ itself is not an converter operated in CCM. Once its location is deter- mined, a simple compensation process can be applied, as explained here.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/datasheet/compensating-rhpz-ccm-boost-converter-analytical-way" target="_blank">read more</a></p> AC-DC Power Supplies DC-DC Converters Portable Power Management Gold Tue, 15 Apr 2014 19:49:00 +0000 32931 at http://powerelectronics.com Solar Cell Achieves 25.6% Energy Conversion Efficiency In Lab http://powerelectronics.com/blog/solar-cell-achieves-256-energy-conversion-efficiency-lab <div class="node-body blog-body"><div></div>Panasonic Corporation announced that it has achieved a conversion efficiency of 25.6% (cell area3: 143.7 cm²) in its HIT® solar cells, a major increase over the previous world record for crystalline silicon-based solar cells.</div> <div class="og_rss_groups"><ul class="links"><li class="og_links first last"><a href="/blog/power-plant">The Power Plant</a></li> </ul></div><p><a href="http://powerelectronics.com/blog/solar-cell-achieves-256-energy-conversion-efficiency-lab" target="_blank">read more</a></p> http://powerelectronics.com/blog/solar-cell-achieves-256-energy-conversion-efficiency-lab#comments Energy Solar The Power Plant Mon, 14 Apr 2014 19:30:00 +0000 32911 at http://powerelectronics.com Understanding the Right-Half-Plane Zero: Part 2 (.PDF download) http://powerelectronics.com/datasheet/understanding-right-half-plane-zero-part-2-pdf-download <div class="field-image-promo"> <a href="/datasheet/understanding-right-half-plane-zero-part-2-pdf-download" class="imagecache imagecache-med_crop imagecache-linked imagecache-med_crop_linked"><img alt="" src="http://powerelectronics.com/site-files/powerelectronics.com/files/imagecache/med_crop/datasheets/thumbnails/half-plane-zero-fig1-0409-1_0.jpg" title="" height="200" width="355" class="imagecache imagecache-med_crop" /></a> </div> <div class="node-body datasheet-body"><div></div>Analytical description of the right-half-plane zero for voltage-mode and current-mode converters.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/datasheet/understanding-right-half-plane-zero-part-2-pdf-download" target="_blank">read more</a></p> Gold Fri, 11 Apr 2014 18:16:00 +0000 32901 at http://powerelectronics.com Waveform Generator Meets Low Frequency Test Needs http://powerelectronics.com/power-electronics-systems/waveform-generator-meets-low-frequency-test-needs <div class="node-body article-body"><div></div>Rigol Technologies, Inc. introduces the DG1000Z series , adding to its extensive portfolio of feature rich test and measurement equipment.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/power-electronics-systems/waveform-generator-meets-low-frequency-test-needs" target="_blank">read more</a></p> http://powerelectronics.com/power-electronics-systems/waveform-generator-meets-low-frequency-test-needs#comments Products Power Electronics Systems Thu, 10 Apr 2014 13:35:00 +0000 32891 at http://powerelectronics.com Liquid Metal Battery Stores Power After Sun Or Wind Retreat http://powerelectronics.com/blog/liquid-metal-battery-stores-power-after-sun-or-wind-retreat <div class="node-body blog-body"><div></div>Ambri is employing Liquid Metal Batteries as the basis of a scheme to store power for significantly less than current battery technologies.</div> <div class="og_rss_groups"><ul class="links"><li class="og_links first last"><a href="/blog/power-plant">The Power Plant</a></li> </ul></div><p><a href="http://powerelectronics.com/blog/liquid-metal-battery-stores-power-after-sun-or-wind-retreat" target="_blank">read more</a></p> http://powerelectronics.com/blog/liquid-metal-battery-stores-power-after-sun-or-wind-retreat#comments Batteries Energy The Power Plant Wed, 09 Apr 2014 16:00:00 +0000 32861 at http://powerelectronics.com Basics of Investigating Inductor Requirements For Power And RF/Microwaves Designs http://powerelectronics.com/engineering-essentials/basics-investigating-inductor-requirements-power-and-rfmicrowaves-designs <div class="node-body article-body"><div></div>Inductors are key circuit elements in many electronic designs, from power and voltage-conversion circuits to higher-frequency RF/microwave circuits. Selecting an inductor that is a good fit for a particular circuit design </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/engineering-essentials/basics-investigating-inductor-requirements-power-and-rfmicrowaves-designs" target="_blank">read more</a></p> http://powerelectronics.com/engineering-essentials/basics-investigating-inductor-requirements-power-and-rfmicrowaves-designs#comments Engineering Essentials Wed, 09 Apr 2014 15:57:00 +0000 32871 at http://powerelectronics.com EPRI Unveils Study on the Integrated Electric Grid http://powerelectronics.com/industry/epri-unveils-study-integrated-electric-grid <div class="node-body article-body"><div></div>The Electric Power Research Institute has launched a study on the transformation of the electric power grid. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/industry/epri-unveils-study-integrated-electric-grid" target="_blank">read more</a></p> http://powerelectronics.com/industry/epri-unveils-study-integrated-electric-grid#comments Industry Tue, 08 Apr 2014 19:53:00 +0000 32851 at http://powerelectronics.com GaN LED Revenue Ascends 10.6 Percent in 2013-but Market's Era of Fast Growth Is Coming to an End http://powerelectronics.com/industry/gan-led-revenue-ascends-106-percent-2013-markets-era-fast-growth-coming-end-0 <div class="node-body article-body"><div></div>Driven by surging demand from the lighting, tablet and cellphone backlighting segments, global revenue for gallium nitride light-emitting diodes (GaN LED) climbed 10.6 percent in 2013, but this could mark the last hurrah for the era of double-digit dollar growth for the market. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/industry/gan-led-revenue-ascends-106-percent-2013-markets-era-fast-growth-coming-end-0" target="_blank">read more</a></p> http://powerelectronics.com/industry/gan-led-revenue-ascends-106-percent-2013-markets-era-fast-growth-coming-end-0#comments Industry Tue, 08 Apr 2014 19:47:00 +0000 32841 at http://powerelectronics.com LPC UARTs Reduce Footprint in Industrial PCs http://powerelectronics.com/power-management/lpc-uarts-reduce-footprint-industrial-pcs <div class="node-body article-body"><div></div>Exar Corporation announced the XR28V382 and XR28V384 UARTs for the Intel Low Pin Count (LPC) motherboard bus.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/power-management/lpc-uarts-reduce-footprint-industrial-pcs" target="_blank">read more</a></p> http://powerelectronics.com/power-management/lpc-uarts-reduce-footprint-industrial-pcs#comments Products Power Management Tue, 08 Apr 2014 19:45:00 +0000 32831 at http://powerelectronics.com 45V 500mA LDO Offers 25µVRMS Noise, Programmable Current Limit & Power Good http://powerelectronics.com/regulators/45v-500ma-ldo-offers-25-vrms-noise-programmable-current-limit-power-good <div class="node-body article-body"><div></div>Linear Technology Corporation announces the LT3065, a high voltage, low noise, low dropout voltage linear regulator offering precision, programmable current limit and a power good flag. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/regulators/45v-500ma-ldo-offers-25-vrms-noise-programmable-current-limit-power-good" target="_blank">read more</a></p> http://powerelectronics.com/regulators/45v-500ma-ldo-offers-25-vrms-noise-programmable-current-limit-power-good#comments Products Regulators Tue, 08 Apr 2014 19:42:00 +0000 32821 at http://powerelectronics.com Ultra-High-Precision Through-Hole Z-Foil Resistor for Applications to +200°C http://powerelectronics.com/passive-components/ultra-high-precision-through-hole-z-foil-resistor-applications-200-c <div class="node-body article-body"><div></div>To meet the growing demand for precise, stable, and reliable resistors that can operate in harsh environments, Vishay Precision Group, Inc. announced that its Vishay Foil Resistors brand (VFR) has introduced a new ultra-high-precision through-hole Z-Foil resistor designed for high-temperature applications up to +200°C. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/passive-components/ultra-high-precision-through-hole-z-foil-resistor-applications-200-c" target="_blank">read more</a></p> http://powerelectronics.com/passive-components/ultra-high-precision-through-hole-z-foil-resistor-applications-200-c#comments Products Passive Components Tue, 08 Apr 2014 19:35:00 +0000 32801 at http://powerelectronics.com DC-DC Converters Suit Harsh Environs http://powerelectronics.com/dc-dc-converters/dc-dc-converters-suit-harsh-environs <div class="node-body article-body"><div></div>Murata announced the SPM series of low power isolated DC-DC modules designed specifically for use in electronic equipment that will be subject to harsh environments such as outdoor communications, applications with little or no forced air cooling, smart grid and industrial process control equipment.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/dc-dc-converters/dc-dc-converters-suit-harsh-environs" target="_blank">read more</a></p> http://powerelectronics.com/dc-dc-converters/dc-dc-converters-suit-harsh-environs#comments Products DC-DC Converters Tue, 08 Apr 2014 19:26:00 +0000 32811 at http://powerelectronics.com High-Performance, High-Resolution, Ultra-Low-Power SAR ADCs http://powerelectronics.com/power-management/high-performance-high-resolution-ultra-low-power-sar-adcs <div class="node-body article-body"><div></div>Texas Instruments (TI) expanded its SAR (successive approximation register) analog-to-digital converter (ADC) product portfolio with a new family of 12 devices that provide the industry's widest analog supply and common-mode voltage ranges</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/power-management/high-performance-high-resolution-ultra-low-power-sar-adcs" target="_blank">read more</a></p> http://powerelectronics.com/power-management/high-performance-high-resolution-ultra-low-power-sar-adcs#comments Products Power Management Tue, 08 Apr 2014 19:25:00 +0000 32791 at http://powerelectronics.com Higher Voltage Ratings for High Temperature, SXP-Style, Encapsulated, Radial Leaded SMPS Capacitors http://powerelectronics.com/passive-components/higher-voltage-ratings-high-temperature-sxp-style-encapsulated-radial-leaded-smps <div class="node-body article-body"><div></div>AVX Corp. has expanded its series of high temperature, SXP-style, encapsulated, radial leaded, switch mode power supply (SMPS) multilayer ceramic capacitors (MLCCs) to include three new high voltage ratings: 1500V, 2000V, and 3000V. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/passive-components/higher-voltage-ratings-high-temperature-sxp-style-encapsulated-radial-leaded-smps" target="_blank">read more</a></p> http://powerelectronics.com/passive-components/higher-voltage-ratings-high-temperature-sxp-style-encapsulated-radial-leaded-smps#comments Products Passive Components Tue, 08 Apr 2014 19:22:00 +0000 32781 at http://powerelectronics.com 1.5 A Monolithic Synchronous Buck-Boost DC/DC Converter http://powerelectronics.com/dc-dc-converters/15-monolithic-synchronous-buck-boost-dcdc-converter <div class="node-body article-body"><div></div>Linear Technology announces the LTC3111, a synchronous buck-boost converter that delivers up to 1.5A of output current from a wide range of power sources, including single or multiple cell batteries, supercapacitor stacks and wall adapters.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/dc-dc-converters/15-monolithic-synchronous-buck-boost-dcdc-converter" target="_blank">read more</a></p> http://powerelectronics.com/dc-dc-converters/15-monolithic-synchronous-buck-boost-dcdc-converter#comments Products DC-DC Converters Tue, 08 Apr 2014 19:03:00 +0000 32771 at http://powerelectronics.com Single Output Power Supplies Available Online http://powerelectronics.com/dc-dc-converters/single-output-power-supplies-available-online <div class="node-body article-body"><div></div>Stadium Power now can provide online its 12, 24 or 48 VDC outputs the SA60 has a 60W output on a compact 2 x 4 in. platform and the SA100 provides 100 W in the industry standard 3 x 5 in. footprint.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/dc-dc-converters/single-output-power-supplies-available-online" target="_blank">read more</a></p> http://powerelectronics.com/dc-dc-converters/single-output-power-supplies-available-online#comments Products DC-DC Converters Tue, 08 Apr 2014 18:03:00 +0000 32761 at http://powerelectronics.com User-Defined Waveform Generator http://powerelectronics.com/power-electronics-systems/user-defined-waveform-generator <div class="node-body article-body"><div></div>Besides accepting digital data from DAQ cards or analog data from function generators to create complex waveforms, the Chroma's 63600 also provides an enhanced feature, User Defined Waveform (UDW), to simulate the actual current profiles and waveforms.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/power-electronics-systems/user-defined-waveform-generator" target="_blank">read more</a></p> http://powerelectronics.com/power-electronics-systems/user-defined-waveform-generator#comments Products Power Electronics Systems Mon, 07 Apr 2014 18:11:00 +0000 32751 at http://powerelectronics.com 16-bit DAC Sprints to 2.5 GSPS, Supports 12.5 Gbps http://powerelectronics.com/pmics/16-bit-dac-sprints-25-gsps-supports-125-gbps <div class="node-body article-body"><div></div>Texas Instruments unveiled the industry's fastest 16-bit digital-to-analog converter (DAC).</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/pmics/16-bit-dac-sprints-25-gsps-supports-125-gbps" target="_blank">read more</a></p> http://powerelectronics.com/pmics/16-bit-dac-sprints-25-gsps-supports-125-gbps#comments Products PMICs Mon, 07 Apr 2014 17:07:00 +0000 32741 at http://powerelectronics.com 3-Phase Power Measurement Modules http://powerelectronics.com/power-electronics-systems/3-phase-power-measurement-modules <div class="node-body article-body"><div></div>WAGO's 3-Phase Power Measurement Modules are cost-effective measurement devices.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/power-electronics-systems/3-phase-power-measurement-modules" target="_blank">read more</a></p> http://powerelectronics.com/power-electronics-systems/3-phase-power-measurement-modules#comments Products Power Electronics Systems Mon, 07 Apr 2014 16:53:00 +0000 32731 at http://powerelectronics.com SMPS Capacitors Are MIL-PRF QPL Approved http://powerelectronics.com/passive-components/smps-capacitors-are-mil-prf-qpl-approved <div class="node-body article-body"><div></div><p><a href="http://www.avx.com" target="_blank">AVX Corporation</a> has received T-Level MIL-PRF-49470 qualification approval for its new 25 V, unencapsulated, BX characteristic (X7R dielectric), horizontally stacked SMPS capacitors in case sizes 1-6.&nbsp; The new components further expand AVX&#39;s already extensive offering of BX characteristic SMPS capacitors listed on the MIL-PRF-49470 QPL, which now includes 25 V, 50 V, and 100 V encapsulated and unencapsulated styles with both high reliability T-Level qualification for space applications and standard reliability B-Level qualification (s</p></div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/passive-components/smps-capacitors-are-mil-prf-qpl-approved" target="_blank">read more</a></p> http://powerelectronics.com/passive-components/smps-capacitors-are-mil-prf-qpl-approved#comments Products Defense Passive Components Fri, 04 Apr 2014 15:42:00 +0000 32711 at http://powerelectronics.com 3 Watt Isolated Dc-Dc Converters http://powerelectronics.com/dc-dc-converters/3-watt-isolated-dc-dc-converters <div class="node-body article-body"><div></div>CUI Inc. announced two isolated dc-dc converter families for industrial, test & measurement, and telecommunication applications.</div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/dc-dc-converters/3-watt-isolated-dc-dc-converters" target="_blank">read more</a></p> http://powerelectronics.com/dc-dc-converters/3-watt-isolated-dc-dc-converters#comments Products DC-DC Converters Fri, 04 Apr 2014 15:16:00 +0000 32701 at http://powerelectronics.com Miniature Axial-Leaded Thick Film Resistor Suits Hearing Aids http://powerelectronics.com/passive-components/miniature-axial-leaded-thick-film-resistor-suits-hearing-aids <div class="node-body article-body"><div></div>Vishay Intertechnology, Inc. introduced a new miniature axial-leaded thick film resistor designed for hearing aids and high-frequency probe tips for testing in industrial applications. </div> <div class="og_rss_groups"></div><p><a href="http://powerelectronics.com/passive-components/miniature-axial-leaded-thick-film-resistor-suits-hearing-aids" target="_blank">read more</a></p> http://powerelectronics.com/passive-components/miniature-axial-leaded-thick-film-resistor-suits-hearing-aids#comments Products Passive Components Fri, 04 Apr 2014 15:04:00 +0000 32691 at http://powerelectronics.com