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What is pulse width modulation (PWM)?
Pulse Width Modulation (PWM) is a way of digitally encoding analogue signal levels. Through the use of high-resolution counters, the duty cycle of a square wave is modulated to encode a specific analogue signal level. In more general terms, a switch is opened and closed in timed pulses, where the time the switch is closed is determines the power output.
Basically, a PWM variable-power scheme switches the power quickly between fully ON and fully OFF tens or hundreds of kHz in the case of a computer power supply (which has a regulated output). The switching rate is much faster than what would affect the load. The term duty cycle describes the proportion of ON time to the regular interval or period of time. A low duty cycle corresponds to low power because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully ON.
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2005-01-11 Micrel buck regulator provides low noise, high efficiency
The new MIC2205 from Micrel is a high efficiency 2MHz PWM synchronous buck regulator that features a LOWQ LDO standby mode.
2005-01-17 MCU, flash enhance battery charger features
Find out the advantages of using an 8bit flash MCU in designing offline Li-ion battery chargers.
2002-05-02 Maxim slave controller targets low voltage dc/dc apps
Maxim Integrated Products has announced the availability of the MAX1980 step-down slave controller intended for use in low voltage, high-current, multiphase dc/dc applications such as those found in CPU core supplies, single- and two-stage converters, and notebooks PCs.
2003-10-30 Maxim driver ICs have flexible output reference
The company's MAX5058 and MAX5059 synchronous-rectifier driver ICs enable secondary-side synchronous rectification in isolated power supplies.
2002-04-03 Maxim dc/dc controllers deliver up to 15A output
The MAX1966 and MAX1967 voltage-mode, PWM step-down dc/dc controllers feature 5-ohm-gate drivers, allowing the ICs to deliver up to 15A of output current.
2002-10-28 Maxim dc/dc controller responds to 300ns transients
The company's MAX1938 dual-phase PWM step-down dc/dc controller features a Quick PWM architecture that allows a transient response within 300ns.
2004-12-21 Maxim dc-dc converter suits notebook, sub-notebook PCs
Maxim's new source/sink step-down dc-dc converter is designed for use in low-voltage active-termination power rails or chipset power supplies.
2001-10-10 M16C/62: Pulse width modulation
This application note describes the operations of PWM for the M16C/62 microcontroller. A sample assembly program is presented to demonstrate the basic functions of PWM.
2001-09-19 LX1686 direct drive CCFL inverter design reference
This application note provides a guide for using Linfinity's LX1686 backlight controller chip in module and magnetic designs. A complete functional description of the chip is included, along with an applications information section.
2008-12-10 LM5032 interleaved boost converter
A basic boost converter converts a DC voltage to a higher DC voltage. Interleaving adds additional benefits such as reduced ripple currents in both the input and output circuits.
2007-08-09 LM3743 high performance controller with comprehensive fault protection features designed for high reliability systems
Data center facilities and telecom base station subsystems must manage the balance of two essential commoditiespower and cooling capacity.
2002-11-20 LM2655 2.5A Synchronous Switching Regulator Evaluation Board
This application note describes the use of an evaluation board based on the LM2655 PWM step-down switching regulator.
2015-01-16 Linear Technology outs 4-channel 8A configurable buck DC/DCs
The LTC3371 aims at systems requiring multiple low-voltage power supplies. It has eight unique output current configurations and is available in 38-pin 5mm 7mm QFN and TSSOP packages.
2009-12-14 LED pump drivers pack digital low-pass filters
Semtech Corp. has added two LED backlight charge pump drivers in its SC65x charge pump platform.
2009-07-03 LED drivers promise flexibility, ease-of-use
Micrel Inc. has unveiled a new series of high-brightness that target solid-state lighting applications.
2009-12-15 LED drivers enable multiple dimming options
XP Power's new family of LED drivers offers the voltage or resistance analog methods for dimming, as well as the pulse width modulation input signal.
2002-05-22 KLA-Tencor Web-based lithography speeds production
KLA-Tencor Corp. has announced the availability of the Web-based Process Window Monitor (PWM) series of lithography systems that enables tighter critical dimension control and is aimed to accelerate the volume production of sub-130nm devices.
2009-02-06 Keeping the control ramp right
If the ramp driving your PWM-based controller isn't linear or monotonic, or just plain noisy, your DC/DC converter isn't going to work up to its capabilities. Here's what you need to know to get the best performance from your system.
2012-05-02 Jury: Fairchild, Power Integrations infringed patents
The verdict concluded the first phase of trial in the litigation which began in 2008.
2006-10-13 Jury favors Power Integrations in patent case against Fairchild
Power Integrations announced that it has won a verdict in its patent-infringement lawsuit against Fairchild Semiconductor.
2006-06-02 ISL6700EVAL1 general purpose design tool
The ISL6700 general purpose design tool is a simple evaluation board which can help the user rapidly construct an isolated DC/DC converter in several configurations.
2006-06-02 ISL6558EVAL2: Low-profile, 5V/12V input, 500kHz and 90 percent efficiency DC/DC converter
This application note first gives a brief introduction of Intersil's four-phase controller ISL6558 and synchronous rectified driver ISL6609.
2004-04-22 IR IC has 1.5 percent accurate voltage tracking capability
International Rectifier has introduced the IRU3138 synchronous PWM controller IC, which comes with adjustable switching frequency.
2004-09-06 IR controller IC targets POL buck converters
The company introduced a pulse width modulated dual synchronous buck controller and driver IC for point-of-load buck converters.
2006-03-23 IP core enables single-chip, closed-loop control systems
Actel introduced CorePWM, a flexible PWM intellectual property IP building block for D/A conversion, designed for the company's nonvolatile FPGAs.
2004-06-16 Intro to timer-based measurement
This article will explain how to use input capture timers to measure quantities from devices such as ADCs and encoders, and the issues you have to consider when using timers in this way which are range, accuracy, sampling rate and drift.
2002-06-20 Intersil to power Legend QDI's latest motherboards
China-based Legend QDI has selected Intersil Corp.'s Endura, to power the Intel Pentium 4 processor on their latest motherboards which are based on the i845G and i845GL chipsets.
2003-09-29 Intersil device offers regulation for AMD processors
Designed for the AMD Athlon 64 processors used in notebook PCs, the Endura ISL6244 controller from Intersil Corp. is a multiphase synchronous-buck PWM controller that has a 5-bit VID.
2003-11-28 Intersil converter IC reduces system costs
Intersil Corp. has announced the Endura ISL6740 and ISL6741, two double-ended PWM controllers designed to reduce overall telecom system costs.
2002-10-10 Intersil combo controller operates up to 24V
Intersil's Endura ISL6226 synchronous buck PWM and LDO combo controller operates over 24V to power chipsets, memory, and audio apps.
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