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Pulse Width Modulators (PWM), page 1
PWM Circuits:  #-A     B-O     P     Q-Z

Last Updated on: Thursday, October 30, 2014 09:22 AM


Circuits Designed by Dave Johnson, P.E. :

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
12V PWM Motor/Light Controller -  The diagrams are for 12V operation only and there are high side (common ground) and low side (common +12V) versions. The low side version of the circuit uses an N Channel FET, the high side version of the circuit uses a P Channel FET. N Channel devices tend to handle more current than P Channel devices, they are also less expensive. The high side version of the circuit is useful when one side of the load has to be grounded.... [G. Forrest Cook]
555 Timer Forms Simple PWM Motor Controller -  Using a CMOS version of the 555 timer, this circuit can be used to control the speed of a motor by adjusting the duty cycle of the pulses sent to the motor.... [Designed by David A. Johnson]
8 Channel PWM Code AVR Controllers -  (circuit schematic added 6/07)
A Simple Circuit for Driving MicroController Friendly PWM Generators -  Microchip Application Note Published 27-Jun-05  (app note added 2/06)
ABR-42023/ PWM Methods for Expanding CCRL Dimming Range Using the ML4877 or ML4878 -  Fairchild Application Notes / (app note added 6/06)

Active Clamp Forward Reference Design -  This reference design is an active-clamp forward converter that can deliver up to 24 A of continuous current at 5 V from an input range of 35 V to 75 V. The active-clamp topology with self-driven secondary synchronous MOSFETs allows  device to achieve high efficiencies....(added 6/06)
Active-clamp/reset PWM IC becomes more versatile -  26-Jun-03 Issue of EDN  The UCC3580 (www.ti.com], IC1 in Figure 1, is an active-clamp/reset-PWM IC that has all the requisites of a power-supply IC except for current limit. You can use the shutdown pin (16] for this purpose (see the UCC3580 data sheet]. But when the shutdown pin activates, the soft-start capacitor normally connected to Pin 15 discharges, and the converter starts again, resulting in hiccup mode.... [Design Idea by Gowripathi and M Sindhu, ITI Ltd, Bangalore, India]

AN268 PWM Amplifier Output Power Calculator -  (app note added 6/07)
AN-292: Applications of the LM3524 Pulse-Width-Modulator -  National Semiconductor Application Note  (app note added 2/06)
AN-4129/ Green Current Mode PWM Controller FAN7601 -  Fairchild Application Notes / (app note added 6/06)
AN538: Using PWM to Generate Analog Output -  Microchip Application Note Published 26-Aug-97  (app note added 2/06)
AN539: Frequency & Resolution Options for PWM Outputs -  Microchip Application Note Published 26-Aug-97  (app note added 2/06)
AN564: Using the PWM -  Microchip Application Note Published 26-Aug-97  (app note added 2/06)
AN-600: Embedding Temperature Information in the ADXL202's PWM Outputs -  AN-600 Analog Devices Application Notes....[App Note]
AN-607: Pulse Width Modulation A/D Conversion Techniques with COP100% Family MicroControllers -  National Semiconductor Application Note  (app note added 2/06)
AN654: PWM, a Software Solution using the 16CXXX Devices -  Microchip Application Note Published 26-Aug-97  (app note added 2/06)
AN655: D/A Conversion using PWM & R-2r Ladders to Generate Sine & DTMF Waveforms -  Microchip Application Note Published 26-Aug-97....[App Note]
AN771: Suppressing Acoustic Noise in PWM Fan Speed Control Systems -  Microchip Application Note Published 27-Jul-04  (app note added 2/06)
AN772: Speed Error in PWM Fan Control Systems TC646, TC647, TC649 -  Microchip Application Note Published 27-Jul-04  (app note added 2/06)
AN-815: Variable Range PWM A/D for COP820CJ -  National Semiconductor Application Note  (app note added 2/06)
AN-824: Eight Channel Eight Bit PWM Controller -  National Semiconductor Application Note  (app note added 2/06)
Analog switch converts 555 timer into pulse width modulator -  15-Feb-07 Issue of EDN  Added CMOS switch enhances a PWM oscillator.... [Design Idea by Jordan Dimitrov, Tradeport Electronics, Vaughan, ON; Edited by Brad Thompson and Fran Granville, Canada]
AN-H23: Avoiding Turn-on Oscillations in HV91 Family PWM ICs -  Supertex Semiconductors  (app note added 2/06)
Apex-AN30 PWM Basics -  6/2002, AN30UREVD : 365 Kb (Apex App Note added 08/08/08)
Apex-AN32 PWM Low Pass Filtering -  2/2001, AN32UREVD : 1508 Kb (Apex App Note added 08/08/08)
Apex-AN33 Spice Model & PWM Amplifier Applications -  6/2007, AN33UREVB : 435 Kb (Apex App Note added 08/08/08)
Apex-AN34 PWM Functionality Test -  2/2001, AN34UREVC : 133 Kb (Apex App Note added 08/08/08)
Apex-AN35 PWM AC/DC Power Supply Design -  12/1999, AN35UREVA : 332 Kb (Apex App Note added 08/08/08)
Apex-AN41 Stability & Biasing for PWM Amplifiers -  11/2004, AN41UREVC : 1766 Kb (Apex App Note added 08/08/08)
Applications of the LM3524 Pulse-Width-Modulator -  National Semiconductor Application Note  (app note added 2/06)
Avoiding Turn-on Oscillations in HV91 Family PWM ICs -  Supertex Semiconductors  (app note added 2/06)

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


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