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

Last Updated on: Friday, July 18, 2008 11:33 AM
 

Circuits Designed by Dave Johnson, P.E. :
  • 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. (added 7/06)
  • PWM Circuit for Motor Speed Control
    Sometimes you want to slow down a brush type DC motor. The most efficient way to do this is with a pulse width modulation (PWM) technique. The hobby circuit below can operate from about 3 volts to 15 volts. The frequency is fixed at about 2KHz but the pulse width can be varied from nearly 100% to 0%. ...

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

300 Watt PWM Amplifier (with stuffing option):  This reference design allows customers with limited knowledge of digital audio amplifiers to quickly build solutions, which meet Dolby, EMI and FTC standards, reducing  time-to-market for new consumer audio products. This 6 channel reference design, based on  TDA8925ST and TDA8926J power stages, is available with an output power of 3 x 100 W.  (app note added 3/05)

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. The design includes remote sense connections for point-of-load regulation and is foot print compatible with Half Brick Modules. (added 6/06)

Active clamp/reset PWM IC Becomes more versatile:  06/26/03 EDN Design Ideas  /  (added 1/05)  The UCC3580 (www.ti.com), IC1 in Figure 1, is an active-clamp/reset-PWM IC that has all  requisites of a power-supply IC except for current limit. You can use  shutdown pin (16) for this purpose (see  UCC3580 data sheet). But when  shutdown pin activates,  soft-start capacitor normally connected to Pin 15 discharges, and  converter starts again, resulting in hiccup mode....

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 and 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 added 6/06)

AN-607: Pulse Width Modulation A/D Conversion Techniques with COP800 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 and R-2r Ladders to Generate Sine and DTMF Waveforms:  Microchip Application Note Published 26-Aug-97   (app note added 6/06)

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)

AN-H23: Avoiding Turn-on Oscillations in HV91 Family PWM ICs:  Supertex Semiconductors  (app note added 2/06)

App Note 30 - PWM Basics:  Apex Microtechnology Corp App Note (added 6/06)

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

App Note 33 - Spice Model and PWM Amplifier Applications:  Apex Microtechnology Corp App Note (added 6/06)

App Note 34 - PWM Functionality Test:  Apex Microtechnology Corp App Note (added 6/06)

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

App Note 41 - Stability and Biasing for PWM Amplifiers:  Apex Microtechnology Corp App Note (added 6/06)

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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