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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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2001-04-30 TPS5625 working with TMS320C6201 applications
This application note describes a design example that uses fast TPS5625 hysteretic controller and low-cost TL5001A PWM controller installed in the SLVP105 and SLVP101 evaluation modules for a TMS320C6201 DSP application.
2013-06-28 Torex debuts 30V, 2A Stepdown DC/DC converter
The XC9250/XC9251 series of 30V, 2A step-down DC/DC converters come with an input voltage of up to 30V, an input rating of 36V, peak voltage of 46V for 400ms.
2004-01-26 Torex chip has 300kHz oscillation frequency
The XC9303 series from Torex USA Corp. is a highly efficient, synchronous PWM, PWM/PFM switching step-up and down dc/dc controller IC.
2001-04-30 TMS320C62x/67x power supply solutions for 1-2 DSPs: Using the TL5001A and TPS7133
This application note describes a low-cost power solution for Texas Instruments' TMS320C6000 DSP applications using the TL5001 PWM controller and the TPS7133 LDO voltage regulator.
2010-02-10 Tiny regulators provide 15 pin-programmable outputs
Semtech has released a 500mA synchronous step-down (buck) regulator with the tiny size and output flexibility needed for low voltage point-of-load regulation, as well as mobile device applications.
2005-02-08 TI digital technology supports MMC wireless audio module
Texas Instruments Inc. (TI)'s PurePath Digital technology has been selected by Mitsubishi Materials Corp. (MMC) for its latest power line communication (PLC), a module designed for transmitting audio signals, targeting wireless audio solutions for home theater applications and audio distribution networks.
2002-06-21 TI dc/dc controllers achieve >95 percent efficiency
Designed with the company's Predictive Gate Drive technology, the TPS4000x family of PWM synchronous step-down dc/dc controllers from Texas Instruments Inc. achieves overall converter efficiencies >95 percent.
2004-06-16 The C programmer's guide to Verilog
This will look at how to implement PWM in software and then turn the design into a logic block that can run from an FPGA and be controlled via software using a memory-mapped I/O interface.
2005-05-04 System General offers lead-free devices
Power management IC provider System General has started to offer lead-free packaging for ATX Supervisor & Combo ICs, PWM control ICs, and Power Factor Correction ICs product lines.
2004-12-13 Switching regulator provides low noise, high efficiency
The MIC2203 from Micrel is a high efficiency 1MHz PWM synchronous buck switching regulator that features low noise constant frequency PWM operation.
2005-01-20 Switching regulator eyes 2.5G, 3G CDMA RF power amps
The MIC2224 from Micrel is a high efficiency 2MHz PWM synchronous buck switching regulator designed for powering 2.5G and 3G CDMA RF power amplifiers.
2000-04-19 Switching power supply control loop design
A simplified approach to feedback control loop analysis is presented in this application note. It starts with a general overview of various parameters affecting performance in a switching power system.
2009-04-03 Step-up converter delivers low-noise output
Maxim Integrated Products has launched the MAX15031, a constant-frequency, PWM step-up converter designed for low-voltage systems that require a locally-generated high voltage.
2006-03-15 Step-down DC/DC converter with internal 1.4A power switch
Linear Technology announced the LT3493, a current mode PWM step-down DC/DC converter with an internal 1.4A power switch, packaged in a tiny 6-pin 2-by-3mm DFN.
2008-07-18 Step-down controller rolls for notebook memories
Maxim Integrated Products has launched the MAX17000 Quick-PWM step-down controller for DDR, DDR2 and DDR3 memory in notebook computers.
2000-06-20 SMPS with L4990 for multisync monitors
This application note can be used as design guide of a flyback converter for a monitor's power supply. The high-performance L4990 PWM controller is being used to meet new spec requirements for a monitor's power supply.
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.
2004-07-16 Selecting and designing a LED driver
The article analyzes the choices, constraints and trade-offs on selecting white LED drivers for portable consumer devices.
2012-10-15 Renesas boasts MCU-based power supply sol'n
The chipset comprises the R2A30521NP, a voltage regulator controller that integrates an MCU-based digital interface, and the R2J20759NP, an intelligent PWM-driver-MOSFET.
2005-04-07 Regulator provides up to 3A
The MIC2207 from Micrel is a high efficiency PWM buck regulator that provides up to 3A of output current.
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.
2009-06-10 PSoC devices pack improved analog, digital performance
Cypress Semiconductor Corp. has launched two new programmable SoC (PSoC) with enhanced analog and digital performance.
2013-04-04 Powering Kintex-7 series FPGA
Read about a solution for powering a typical Xilinx Kintex-7 series FPGA using Maxim's power-supply solutions.
2007-11-26 Power switches cut losses by 500mW
Power switches that increase efficiency and reduce EMI in power supplies have been tipped by Fairchild Semiconductor.
1999-04-08 Power supply design with fast transient response using V? control scheme
This paper presents an overview of the V? technology and how this particular signal analysis technology becomes a tool for further revealing the V? control.
2006-03-14 Power supply design delivers less than 1W
ON Semiconductor unveiled a GreenPoint reference design for CRT-TV power supplies that delivers standby power of less than 1W.
2001-09-19 Power solutions for flexible motherboards
This application note presents a discussion of the power supply options facing designers, showing low-cost flexible motherboard power supply designs, based on Linfinity's LX166x Advanced PWM controller IC family.
2012-11-21 Power MOSFETs support high-efficiency DC/DC design
Microchip's power-conversion controllers are high-voltage analogue buck PWM controllers with integrated MOSFET drivers, boasting outstanding transient performance.
2006-06-02 Power management controller for mixed-voltage FPGA based systems
The versatility of the ISL6521 lends well to powering most any embedded processor or logic device which require a regulated high current, low voltage supply and up to three independent, lower current supplies.
2000-06-20 Power capability of VIPerXX0 family devices
This application note gives a method for estimating the power dissipation of the VIPerXX0 off-line switchers. The user can then define what is the reasonable maximum output power in the frame based on his application.
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