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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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2000-06-01 Using the PWM
This application note provides examples, which illustrate the uses of PWM using the PIC17C42 Timer1 or Timer2 modules. These examples may be modified to suit the specific needs of your application.
2005-06-03 Using the ISL6420 PWM controller evaluation board
This app note discusses the ISL6420 in a complete control and protection scheme for a high-performance dc/dc buck converter
2001-10-03 Using ST7 PWM signal to generate analog output (Sinusoid)
This application note presents how to use the ST72511R4's PWM and BRM (binary rate multiplier) generator for the generation of a 50Hz sinusoid tunable in average and amplitude.
2000-05-31 Using PWM to Generate Analog Output
This application note shows how to generate analog outputs by using the cheap pulse width modulators, instead of the more costly, high-resolution DACs.
2001-05-11 Using PWM output as a digital-to-analog converter on a TMS320C240 DSP
This application note presents a method for utilizing the on-chip PWM generators on Texas Instruments' TMS320C240 DSP for D/A conversion.
2004-12-16 Using cost-effective PWM controller for small power-offline apps
The article presents the development of a new PWM power-supply controller IC for universal input and low-power applications.
2009-08-04 Understand thermal derating aspects of PWM ICs to ensure the best system performance
This article describes how to construct and calibrate a thermal-derating box for evaluating the thermal performance of PWM controllers.
2001-05-09 TMS320C24x PWM full compare in symmetric mode
This application note presents applications of the TMS320C24x PWM DSP Full Compare, including up to six PWM, three PWM and three complemented PWM generation in symmetric mode.
2007-10-31 Tiny PWM controllers fit motherboard, POL apps
STMicroelectronics has extended its portfolio of power management devices with a new family of flexible and high-performance PWM controllers intended for motherboard and POL markets.
2013-04-26 TI's PWM audio processor runs dual ASRCs
The HD-compatible TAS5548 accepts sample rates from 8kHz to 192kHz and converts them to a fixed rate of 96kHz or 192kHz, eliminating the need to create, store and change coefficients.
2004-09-15 TI PWM processor offers eight speaker channels
TI unveiled a digital amplifier PWM processor that provides up to eight speaker channels with 48bit processing.
2004-01-09 TI PWM device capable of 48-bit processing
Texas Instruments has introduced a digital audio PWM processor with an integrated 48-bit digital audio processor.
2008-04-14 TI debuts PWM-input 20W Class-D power stage
TI says it has introduced the industry's first PWM-input 20W stereo Class-D power stage with closed-loop feedback.
2010-01-07 Supplement the MAX6948 WLED driver with external PWM control
This application note explains how to add external PWM intensity control to supplement a device's internal PWM. The MAX6948 WLED driver serves as the example device. Configuration settings and performance data are shown.
2005-05-26 Supertex PWM controller IC uses low noise boost-buck topology
The new HV9930 from Supertex is a variable frequency PWM controller IC designed to control an LED lamp driver using a low noise boost-buck topology.
2009-04-28 STMPE2401—port expander PWM controller
This application note explains the setup and programming of the integrated PWM controller in STMPE2401 to do LED backlighting, brightness control and LED blinking patterns.
2003-06-13 Step-up dc-dc converter (PWM): Monolithic IC MM1349
This application note discusses the MM1349 device, which is used to step up the dc input level of portable apps to a fixed value.
2011-03-24 Step-down LED driver offers 10,000:1 true color PWM dimming
Linear Technology's LT3597 60V, 1MHz, step-down DC/DC converter operates as a three channel, constant current LED driver for backlighting LED billboards as well as industrial, automotive and medical displays.
2002-06-20 Stability and biasing for PWM amplifiers
This application note describes the stability and biasing of PWM amplifiers.
2004-12-15 Speed error in PWM fan control systems
This app note describes speed error in PWM fan control systems
2001-05-15 Space-vector PWM with TMS320C24x/F24x using hardware and software determined switching patterns
This application note gives an in-depth discussion of the theory and implementation of the space vector PWM technique using Texas Instruments' TMS320C24x/F24x DSP series.
2006-07-27 Solution tops PWM in series-connected LED control
The company said its new inductive boost DC/DC converter has surpassed the former de facto standard PWM technique to control series-connected LEDs.
2007-08-13 Software PWM generation for LED dimming and RGB color applications
This application note describes a software solution that generates one or more pulse-width modulated signals using a PIC microcontroller.
2008-10-20 Six-phase PWM controllers meet Intel VR11.1 requirements
ON Semiconductor has introduced the ADP4000 and ADP4100, claimed to be the first six-phase pulse width modulation (PWM) controllers.
2004-03-31 Sipex PWM controller handles up to 28V
The SP6132HV from Sipex is a high voltage, synchronous step-down PWM controller that is engineered for stepping down dc input voltages ranging from 3.3V up to 28V.
2002-01-17 Sipex PWM controller employs dual NFETs, operates at sub-1V level
The SP6123 dc/dc PWM synchronous buck controller was developed to meet the demand for accurate, rugged and highly reliable sub-1V power buses.
2007-02-05 SH7641 MCU: Output of three-phase complementary PWM signals
This article describes a sample task in which PWM waveforms in three-phases are output along with corresponding inverse waveforms that include non-overlapping sections.
2004-09-03 SG new PWM IC suits motor driving apps
System General announced a new addition to its Green Mode PWM IC series—the SG6846.
2006-09-20 PWM motor driver targets automation, industrial markets
Allegro MicroSystems has announced the A3992, a DMOS full-bridge microstepping PWM motor driver targeted at the office automation and industrial markets.
2009-05-28 PWM intensity control for the MAX6964 LED driver
This application note describes the unique features of the MAX6964 LED driver and how these features can be used properly in applications requiring intensity control. The application note also provides example programming routines showcasing the intensity-control selections for both master and individual port selections of the MAX6964.
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