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Power Management Chip Vendors Zero in on Wireless
by
Vincent Biancomano, EE Times
Power-managing ICs in wireless products are now playing a major role in system-level solutions. Cell phones, which are being combined with PDAs and cameras, are becoming increasingly small, dense and power-hungry, offsetting the size and energy density advances made by the lithium-ion battery sources powering them.
 Opinion : Archive
Fairchild Semiconductor's "Green" Single-Chip BDCMOS Power Switches Boast High Efficiency While Lowering Standby Power Consumption and Switch-Mode Power-Supply Component Count
Low Resistance Puts Power MOSFET from STMicroelectronics in Line for DC/DC Converter Duty
Infineon Helps "Power Down" Electric Lighting
LTC4150: Battery Gas Gauge Counts Charge and Discharge in Handheld PCs and Portable Products
ON Semiconductor Introduces Family of Multiphase CPU Controllers Including Industry's First Six-Phase Integrated Device
New 150 V High-Barrier-Height Schottky Rectifiers Offer Low Forward Voltage Drop, Low Leakage, and Maximum Junction Temperature of 175 degrees C
TI Introduces 1.5 A PWM High-Side Driver for Electromechanical and Thermal Devices
Powerex Expands 1700 V IGBT Offering to 2400 A
LT3804: Isolated Dual-Output 100 W DC/DC Controller Integrates Opto Driver
National Semiconductor Improves Power-Supply Efficiency and Reliability with Industry's First Dual 5 A Gate Drivers
Reviews : Archive
Dealing with Noise Generated by a DC/DC Converter
by
Beta Dyne Inc.
During the conversion process, all DC/DC converters generate unwanted high-frequency noise. Over the years designers have used different designs and topologies to minimize and/or eliminate the noise in DC/DC converters. The most commonly used noise-reduction component is a low-pass filter at the output and/or input.
"Shoot-Through" in Synchronous Buck Converters
by
Jon Klein, Fairchild Semiconductor
The synchronous buck circuit is in widespread use to provide "point-of-use" high-current, low-voltage power for CPUs, chip sets, peripherals, etc. In the synchronous buck converter, the power stage has a "high-side" MOSFET to charge the inductor, and a "low-side" MOSFET that replaces a conventional buck regulator's "catch diode" to provide a low-loss recalculation path for the inductor current. Shoot-through is defined as the condition when both MOSFETs are either fully or partially turned on.
Proper Layout and Component Selection Controls EMI
Inrush Current Control
How to Choose the Perfect Battery
Practical Switching Regulator Circuits
High-Side Current-Sense Measurement: Circuits and Principles
Snubber Circuits Suppress Voltage Transient Spikes in Multiple-Output DC/DC Flyback Converter Power Supplies
Thermal and Reliability Study on High-Current Thermal Vias and Output Pins
High-Frequency DC/DC Conversion using High-Current Bipolar Transistors
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Neil Chadderton and Dino Rosaldi
This application note discusses the switching capabilities of bipolar transistors, including charge analysis and circuit techniques to permit high-frequency saturated switching. Circuit examples are presented to illustrate speed-up methods, and charts are included to demonstrate the resulting efficiency improvements. The application note also includes turn-off charge vs. bias-point characterization charts for typical high-current, low-VCE(sat) bipolar devices targeted for low-voltage and battery applications.
Application Notes : Archive
TI Introduces 14 A Excalibur™ Plug-In Power Modules for Point-of-Load Applications (Product of the Week)
A new series of point-of-load (POL) DC/DC converters from TI promises to offer significant size reduction while maintaining high conversion efficiencies and an adjustable output-voltage capability. POL converters offer on-demand distributed-power solutions, are less susceptible to line and distribution impedances, and have faster transient load response.
 TI Introduces 14 A Excalibur™ Plug-In Power Modules for Point-of-Load Applications (Product of the Week)
International Rectifier Introduces Highly Efficient, Industrial-Qualified MOSFETs for Uninterruptible Power Supply and Motor Control
National Semiconductor Redefines Power-Management Solutions for High-Voltage Power-Conversion Applications
• More Product Reviews
Dealing With Noise Generated by a DC/DC Converter
All DC/DC converters generate unwanted high-frequency noise during the conversion process. Over the years, designers have used different designs and topologies to minimize and/or eliminate the noise in DC/DC converters.
• More App Notes
Feature—Check in on the latest from Chipcenter editor Frank Greenhalgh.
• More Features
PowerDesigners' InfoWeb. Visit one of the most useful Web sites for power-supply designers. It includes interactive tutorials on subjects such as the switching characteristics of power devices, as well as several databases and a reference library with reviews of books relevant to designing power supplies.
Web-based Tools. Visit our collection of engineering tools that run in your browser. This is the real thing, folks, not an area where you download PC-based tools, but a place where you simulate online.
Standards Watch. Check here for news on proposed standards from IEEE, IEC, etc., and ad hoc industry groups.
Dr. Nasser Kutkut, the consulting editor for the Design Center's Power & Power IC section, is founder and CEO of PowerDesigners, LLC, a power electronics firm and Web information service. Dr. Kutkut's design and research experience includes soft-switching power conversion, high-power converters and inverters, high-frequency magnetics design, and electric-vehicle battery charging and equalization.
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