Pulse Width Modulators (PWM), page 3
PWM Circuits:  #-A     B-O     P     Q-Z
Last Updated on: Friday, July 18, 2008 11:33 AM
 

PLD code creates PWM generators:  08/08/02 EDN Design Ideas  /  (added 1/05)  The PLD (programmable-logic-device) code in Listing 1 creates arbitrary-resolution, pulse-width-modulated (PWM) generators. PWM generators are useful as low-bandwidth D/A converters in hardware of microprocessor-based systems. When you pass it through a simple RC lowpass filter, a PWM waveform becomes a voltage that's approximately equal to the PWM duty cycle times the supply voltage....

Processor's PWM output Controls LCD/LED Driver:  05/27/04 EDN Design Ideas  /  (added 1/05)  The PWM (pulse-width-modulation) output available from many microprocessors is based on an internal 8or 16-bit counter and features a programmable duty cycle. It is suitable for adjusting the output of an LCD driver, a negative-voltage LCD driver, or a current-controlled LED driver. cost alternative that provides not only a 4to 20-mA output,

Provide 4  to 20 MPWM Control:  09/01/98 EDN-Design Ideas / (added 5/02)   -Are useful when you use4to20-mA current-loop signals to control a PWM signal

Pulse Width Modulation A/D Conversion Techniques with COP800 Family Microcontrollers:  National Semiconductor Application Note   (app note added 2/06)

Pulse Width Modulation DC Motor Control:  controls the motor speed by driving the motor with short pulses (added 5/02)

Pulse Width modulator 4093:  (circuit added 9/04)

Pulse Width modulator 555:  (circuit added 9/04)

Pulse Width Modulators:  generating PWM waveform is extremely simple with the circuits shown in this page (added 5/02)

Pulse Width-to-Voltage Converter:  (electronic (schematic / circuit added 4/02)

PWM AC-DC Power Supply Design - App Note 35:  Apex Microtechnology Corp App Note (added 6/06)

PWM ADC is Surprisingly Accurate:  06/09/94 EDN-Design Ideas / (added 3/03)  The reference voltage in Fig 1a's simple rail-to-rail PWM ADC is the only critical component. The input-voltage range extends from ground to the power rail which also acts as the reference. The circuit is essentially a variation on the classic dual-slope integrator, the slopes being proportional to VIN and VREF-VIN. The circuit works well in µP-based systems that have the spare capacity to perform the mark/space measurement and the necessary calculations.....   

PWM circuit controls sensor's AGC:  03/29/01 EDN-Design Ideas / (added 2/06)

PWM circuit uses fuse to sense Current:  12/23/99 EDN-Design Ideas / (added 3/03)

PWM Circuit uses one OpAmp:  07/06/00 EDN-Design Ideas / (added 6/03) circuit delivers a rectangular signal with duty cycle varying between0 and100% in response to an input signal varying from0 to5V dc

PWM Controller:  555 Timer based PWM motor control project for electric fan or other DC motor (added 5/02)

PWM Controller Drives LEDs from high Voltage lines:  03/04/04 EDN Design Ideas  /  (added 1/05)  Powering LEDs from a wide dc range—say, 30 to 380V—without wasting a lot of power in the regulating block, is a difficult task when the LED current needs to be constant. Dedicated LED drivers are available, but they usually implement boost structures and are thus inadequate for high-voltage inputs....

PWM DC motor Control with SG3525:  (electronic circuit added 4/05)

PWM DC Motor Speed Control:  (electronic (schematic / circuit added 4/02)

PWM Hydrogen Generator:  (circuit / schematic design added 11/06)

PWM Low Pass Filtering - App Note 32:  Apex Microtechnology Corp App Note (added 6/06)

PWM Methods for Expanding CCRL Dimming Range Using the ML4877 or ML4878 / ABR-42023:  Fairchild Application Notes / (app note added 6/06)

PWM motor Controller:  (electronic circuit added 4/05)

PWM Motor Speed Controller/DC Light Dimmer:  (electronic circuit added 4/05)

PWM Motor/Light Controller:  (circuit / schematic design added 6/06)

PWM Motor/Light Controller Variations:  diagrams are for12V operation and there are high side (common ground) and low side (common +12V) versions (added 5/02)

PWM Speed Control:  includes theory and some example circuits (added 5/02)

PWM Watchdog Circuit Ensures upper Bounds:  11/07/96 EDN-Design Ideas / (added 5/02)   With PWM control of power factor, you need a continuous check on excess pulse width and dead periods to protect a variety of systems that may not incorporate such protection. You also need regular pulsed power to ensure good averaged, reconstructed power-signal waveforms for which the dead period for the PWM signal must not exceed limits. The circuit in Figure 1 monitors both excess high-level pulse width and excess dead period and visually warns the user of problems in the PWM function.   Excess high-level pulse width turns on the normally off, red LED, and excess....

PWM White LED Drivers:  (electronic circuit added 4/05)

PWM, a Software Solution using the 16CXXX Devices:  Microchip Application Note Published 26-Aug-97   (app note added 2/06)

PWM Circuits:  #-A     B-O     P     Q-Z