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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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2006-02-21 Digital signal controllers have highest PWM resolution
Texas Instruments announced four new members of the TMS320C2000 platform designed for motor control, digital power conversion and intelligent sensor control.
2004-12-01 Designing for high efficiency with the active clamp UCC2891 PWM controller
This app note discusses high efficiency designs with active clamp UCC2891 PWM controller.
2013-02-14 Design DC-DC converter with DS1875 PWM controller
Learn about the operation of a boost converter that uses the DS1875.
2000-12-08 Design considerations for clamping networks for very high voltage monolithic off-line PWM controllers
This application note details what network is best adapted to the protection of high-voltage, monolithic, off-line PWM controllers and how to predict efficiency in the application.
2005-01-27 DC/DC converters with automatic PFM-PWM mode operation
National unveiled the first two products in a family of miniature, high efficiency synchronous step-down DC/DC converters for portable systems.
2002-05-06 Customizing the linear circuitry response of HV91 family PWM ICs via the bias resistor
This application note describes the process of customizing the linear circuitry response of HV91 family PWM ICs via the bias resistor.
2001-05-09 Creating a sine modulated PWM signal using the TMS320F240 EVM
This application note describes how to generate an asymmetrical PWM signal with a varying duty cycle using the TMS320F240 assembly code.
2005-10-26 Controller with two PWM regulators, two LDO linear regulators
STMicroelectronics introduced the first device in a new family of products designed to provide one of the world's most cost-effective and compact solutions for mobile PC power management.
2001-05-07 Configuring PWM outputs of TMS320F240 with dead band for different power devices
This application note describes how to configure the PWM outputs of Texas Instruments' TMS320F240 DSP controller with dead band for different power devices.
2009-09-29 Compact PWM regulators support Intel mobile CPUs
Intersil has developed compact multiphase PWM regulators that comply with the Intel Mobile Voltage Positioning specification.
2007-08-22 Battery-charger PWM input has watchdog protection
Adding watchdog protection to the charger-input circuitry of a mobile phone guards against damage when the baseband processor stalls or ceases software execution.
2002-03-08 Basic Stamp I application note: Using PWM for analog output
This application note explains how to convert digital signals to analog voltages using the Basic Stamp PWM.
2002-05-06 Avoiding turn-on oscillations in HV91 family PWM ICs
This application note describes the process of avoiding turn-on oscillations in HV91 family PWM ICs.
2008-06-30 Applying SG6902 to control a CCM PFC and flyback/PWM power supply
This application note shows a step-by-step design to a 120W/24V power adapter. The equations can also be applied to different output voltages and wattages.
2002-10-31 Anachip ships dual-channel PWM controller
Anachip's AP2001 dual-channel PWN controller incorporates all the functions required for the construction of two PWM control circuits into a 17-lead SOP or PDIP.
2006-11-08 Allegro unrolls dual full-bridge PWM motor driver
Allegro has rolled out a new dual full-bridge PWM motor driver designed to drive both windings of a two-phase bipolar stepper motor.
2001-05-07 AC induction motor control using constant V/Hz principle and space vector PWM technique with TMS320C240
This application note reviews the principles of constant V/Hz control for AC induction motor and space vector PWM technique using Texas Instruments' TMS320C240 DSP controller.
2005-06-17 A simple circuit for driving microcontroller friendly PWM generators
This app note discusses a simple circuit for driving microcontroller friendly PWM generators.
2006-10-24 3-phase motor drivers integrate PWM capability
Toshiba America Electronic Components Inc. is announcing three high-voltage three-phase motor drivers with built-in power management circuits for direct current brushless motors, air conditioner fans and pump motors.
2010-11-11 2A PWM step-down converter optimized for 5V, 12V rail
Exar's XRP7664 can operate on input voltage of up to 18V with max load current of 2A
2004-12-01 200W interleaved forward converter design review using TI's UCC28221 PWM controller
This app note reviews the design of a telecom converter that converts a telecom input range of 36V to 75V dc down to a regulated 12V, 200W dc output.
2003-06-19 16-bit PWM using an on-chip timer
This application note describes how to implement a 16-bit pulse width modulator (PWM) digital-to-analog converter (DAC).
2006-12-20 'Highest-frequency' 3A PWM buck regulator rolls
Micrel's 3-by-3mm MLF 2.7MHz 3A PWM buck regulator is said to be the industry's highest-frequency 3A device.
2002-04-19 Write your own generic SPICE Power Supplies controller models
This application note consists of writing your own generic model of the PWM controller and then adapting its intrinsic parameters to comply with the real one being used. Fixed frequency Current Control Mode and Voltage Control Mode models are covered here as well.
2011-07-22 Wide input flyback converter features 5V at 2.6A output
Here's a reference design is for a flyback, 5V Class 3 powered device (PD) with a wide 9V to 57V auxiliary input.
2014-01-30 Utilise MSP430 Timer_D module in hi-res mode
Here's a look at the high-resolution feature of the Timer_D module introduced in MSP430F51x1 and MSP430F51x2.
2004-05-04 Using the Z8 Encore! Timer
This app note highlights the Z8 Encore! timer functionality and provides a set of routines to use the device in different modes, such as one-shot and continuous modes.
2000-06-05 Using the CCP Modules
This application note discusses the operation of a Capture Compare and PWM (CCP) module, and the interaction of multiple CCP modules with the timer resources.
2003-12-20 Using DS1050 Programmable PWMs to Control a DC Motor and an LCD LED Backlight
This application note shows examples on how to use the DS1050 as a dc fan controller and as a backlight brightness controller for an LED backlit LCD.
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.
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