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PWM What is pulse width modulation (PWM)? Search results

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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2001-06-07 PWM in background on the TICkit62 (Fancy example with relay control of direction and braking)
This application note explains the PWM operation on the TICkit62 controller by presenting an example of driving a relay.
2011-08-03 PWM generator features 48 12bit resolution channels
Linear Technology's PWM generator operates at 3C5.5V input range and features 48 12bit resolution channels.
2003-09-19 PWM Generation with ST62 Auto-Reload Timer
This application note describes how to use the ST62 ARTimer to generate a PWM signal with tunable frequency and duty cycle.
2003-09-19 PWM Generation with ST62 16-bit Auto-Reload Timer
This application note describes how to use the ST62 16-bit ARTimer to generate a DTMF signal with the PWM.
2007-04-18 PWM generation using HCS12 timer channels
The generation of a PWM signal using the dedicated HCS12 PWM module is based on hardware comparisons between register values and free running hardware counters. The timer module offers similar hardware comparison in the form of output compare circuitry.
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.
2005-02-11 PWM device provides 2 synchronous buck voltage outputs, 1 linear controller output
Intersil released a highly efficient, 3-in-1 PWM solution for providing two synchronous buck voltage outputs and a linear controller output.
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.
2012-06-21 PWM controllers up SMPS reliability, cut board space
Fairchild Semiconductor's FSL206MRx integrated PWM controllers integrate an internal regulator that eliminates the need for an auxiliary bias winding.
2009-12-08 PWM controllers up efficiency at light load
Fairchild's PWM controllers include frequency hopping, which reduces EMI emissions, and internal soft start to lessen voltage stress on the MOSFET at start up.
2009-05-21 PWM controllers up design flexibility of HB LEDs
Fairchild Semiconductor is offering primary side regulation PWM controllers that simplify design, reduce board space and provide important performance advantages for HB LEDs.
2009-07-08 PWM controllers trim output capacitance
Micrel Inc. has unveiled a new line of PWM controllers dubbed the Hyper Speed Control family, which features architecture that reduces the required output capacitance and allows for excellent transient response.
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.
2009-10-23 PWM controllers power DDR3 DIMMs
The IR3522/IR3506 chipset tracks accurately and enables margining between VDDQ and Vtt outputs.
2002-11-20 PWM controllers help meet standby power requirements
ON Semiconductor's NCP1200A and NCP1203 PWM current-mode controllers enable power supply designers to meet standby power regulations.
2010-02-24 PWM controllers deliver fast transient response
The ISL7884x family from Intersil Corp. are claimed to be the most robust, military temperature, radiation-hardened PWM controllers for flyback and forward topologies.
2006-08-28 PWM controllers deliver 'fastest' transient response
Intersil said its new family of four-phase synchronous PWM buck controllers deliver the fastest transient response with the fewest output capacitors for advanced Intel VR10/11 and AMD AM2 microprocessors.
2005-04-07 PWM controllers cut component count
Maxim claims that its new PWM buck controllers allow the design of high-output-current, compact power supplies with a minimum number of external components.
2006-05-12 PWM controllers cut bulk output capacitance
Intersil's new PWM controllers deliver cost and real-estate savings with a design that cuts the amount of output bulk capacitance.
2015-02-09 PWM controllers boost operating efficiency, minimise noise
The AP3125 current-mode devices are optimised for offline AC-DC converters in portable products, consumer electronics and domestic appliances.
2011-08-19 PWM controllers boast up to 95% efficiency
TI has launched two high-efficiency PWM power supply controllers that simplify design and boost efficiency in telecommunications, server and industrial systems.
2004-10-01 PWM controller uses only one primary side MOSFET
The latest current mode PWM controller from Linear Technology uses only one primary side MOSFET.
2013-04-02 PWM controller touts less than 10mW standby power
TI's LM5023 PWM controller exceeds Energy Star 5 standby power requirements for 10-65W AC/DC adapters used with notebooks, motor control, smart meters and micro-inverters.
2007-08-21 PWM controller targets notebook PC systems
Anpec's APW7108 dual-channel PWM controller is designed to provide power regulation for chipsets, graphics and other system electronics in notebook PCs.
2007-02-14 PWM controller suits synchronous DC/DC apps
IR has introduced the IR3651, a synchronous PWM control IC designed for high performance synchronous DC/DC buck applications with an input voltage range up to 75V.
2007-02-05 PWM controller simplifies flyback power supplies
Linear Technology has introduced the LTC3805, a current mode, programmable frequency PWM controller that reduces the size and complexity of flyback power supplies.
2011-06-27 PWM controller saves space
Fairchild Semiconductor launched FAN6863, a PWM controller that touts lower standby power and higher efficiency.
2003-09-01 PWM controller regulates power in datacom systems
Intersil has released the ISL6721 single-ended current-mode PWM controller that is designed to regulate power in telecom and datacom systems.
2013-09-20 PWM controller reduces cost for smartphone power supplies
Dialog Semiconductor's iW1679 digital AC/DC PWM controller allows low-cost, 10W power bipolar junction transistor switches to reduce BOM cost in 5V/2A smartphone adapters and chargers.
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