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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 op
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2001-04-19 Three and four phase brushless dc motor controllers using pulse-width modulation
This application note describes LSI Computer Systems' five motor circuits (LS7260, LS7261, LS7262, LS7263 and LS7264) that drive brushless DC motor controllers.
2000-06-26 Pulse-width modulation in Xilinx programmable logic
This application note demonstrates how to build a variable PWM waveform using a counter and a storage register.
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.
2004-12-15 Spectrum analyzer spans time, frequency, modulation domains simultaneously
Tektronix's new RSA3408A spectrum analyzer debuts at a time when RF systems are racing up the curve in complexity and scope.
2002-01-25 LeCroy power tester performs modulation and line power analysis
Aside from performing standard power measurements, the PS354 also tests harmonic distortion against standardized templates for class A to D equipment.
2009-04-20 DS345 as a pulse generator
The DS345 can easily be used as a pulse generator. Pulse widths down to 500ns with rise/fall times of 30ns are possible. You can even do bursts of groups of pulses (each pulse has to be the same width and separated by one pulse width
2005-07-27 Agilent pattern/pulse stimulus generator spans 150MHz to 7GHz
Agilent's latest 81141A instrument, with its memory-based pattern generator, can be used all the way up to 7GHz (and down to 150MHz).
2005-10-11 Serial pulse data generator with 13.5GHz stimulus capability
Agilent Technologies recently announced what it touts as the industry's fastest serial pulse data generator, with stimulus capability up to 13.5GHz
2006-12-18 Use pulse-shape filtering for smooth transitions
Filters are an important part of communications systems. They are used to eliminate spectral leakage, reduce channel width, and eliminate interference from adjacent symbols (ISI
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.
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
2015-11-25 Tracking down ECU disturbances from EMI
In this article, we examine how to use oscilloscopes to detect ECU disturbances from electromagnetic interference.
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.
2008-04-28 Three-channel step-down DC/DC converter touts LDO controller
A triple channel, current mode, pulse-width modulation step-down DC/DC converter with three internal 36V power switches and an LDO controller has been announced by Linear Technology Corp.
2011-01-19 Temp sensor IC enables efficient LED lighting
Seiko Instruments Inc. (SII) launches the S-5855A Series of pulse width modulation (PWM) output temperature sensor IC for LED lighting designs.
2002-06-20 Stability and biasing for PWM amplifiers
This application note describes the stability and biasing of PWM amplifiers.
2004-11-10 Siliconix announces replacements for UCC380x, UCC280x controllers
A new family of low-power current-mode controllers that provide increased efficiency and flexibility in cost-sensitive power-supply designs was announced by Siliconix.
2002-08-21 Samsung Electro to use Fairchild controller IC for PDP, PC apps
Samsung Electro Mechanics has selected Fairchild Semiconductor's ML4824 PFC/PWM controller combo IC for its latest SMPS designs targeted for PDP and PC applications.
2006-04-25 PWM fan speed controller IC with wide input voltage range
Supertex's new PWM fan speed controller has a wide input voltage range of 16V to 90V, making its suitable for use in 24V and 48V systems.
2002-07-01 PWM easing digital control of analog circuits
By controlling analog circuits digitally, system costs and power consumption can be drastically reduced.
2006-02-03 PWM controllers with ±0.5% system accuracy
Intersil has introduced a new family of VR11 pulse width modulation controllers with the industry's highest accuracy.
2005-03-11 PWM controllers provide flexibility
National rolled out what it bills as the industry's first 100V dual interleaved pulse-width modulation controllers for conventional single-ended and active-clamp reset topologies.
2006-03-21 PWM controller IC reduces solution footprint by 45%
International Rectifier introduced the IR3624, a 600kHz single-phase synchronous buck PWM controller IC designed for high density, 10A non-isolated POL regulators.
2009-11-30 PWM controller boasts power, space savings
Texas Instruments Inc. is offering an off-line green mode pulse-width modulation (PWM) controller that minimizes space and system cost while providing high efficiency in power supply applications.
2005-10-18 PWM advances active-clamp converter designs
National Semiconductor says its LM5026 pulse-width-modulation controller is the industry's most advanced type for forward converter toplogies using an active-clamp/reset design.
2006-03-22 PoE controller integrates power interface port
National Semiconductor introduced its single-chip power-over-Ethernet controller for higher-power PoE applications.
1999-12-01 PMW low pass filtering
Pulse width modulation (PWM) amplifiers often require low-pass filtering of the output to demodulate the PWM carrier. These filters can be as simple as a single inductor to multiple LC nodes depending on the application. In some motor and solenoid applications, the load can act as its own filter. Deciding on the type and size of a filter can be time consuming since the calculations can be tedious and often give component values that are not easily obtainable. This application note is an effort to reduce filter calculation time.
2013-12-02 Phase voltage reconstruction based on Qorivva MCUs
Know the Freescale Qorivva family features/approaches that can be used for motor control algorithms.
2005-06-08 PFC, PWM controller provides standby power consumption
ON Semi's NCP1603 device is a PFC and PWM combo controller that offers extremely low no-load standby power consumption because of its skipping cycle operation and PFC-stage shutdown while in standby mode
2007-11-01 Perform power factor correction efficiently
Take a peek at the inner workings of a board that can perform continuous conduction mode power factor correction efficiently and with a minimum number of peripheral components.
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