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Simple circuit allows long PWM soft-starts - 1-Feb-07 Issue of EDN
Enhance timing accuracy of a switching regulator's start-up ramp.... [Design Idea by
Robert N Buono, Aeolian Audio LLC, Bloomfield, NJ; Edited by Brad Thompson and Fran
Granville] |
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Simple Circuit for Driving MicroController Friendly PWM Generators -
Microchip Application Note Published 27-Jun-05 (app note added 2/06)
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Simple circuit provides efficient PWM - 02/18/99 Issue of EDN You
often need to control the duty cycle of a square wave. The circuit in Figure 1 works
from a single 5V supply at a frequency of 100 kHz. With minor component changes, you
can configure it for a range of frequencies. The circuit consists of a ramp (sawtooth]oscillator....Page
includes several designs. Scroll to find this one.... [Design Idea by Kenneth
Levine, Eldec, Lynwood, WA] |
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Simple DC Motor PWM speed control - ….(electronic schematic added 08/08)
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Simple nanosecond width pulse generator provides high performance -
11-Nov-04 Issue of EDN If you need to produce extremely fast pulses in response
to an input and trigger, such as for sampling applications, the predictably
programmable short-time-interval generator has broad uses. The circuit of Figure 1,
built around a quad high-speed comparator and a high-speed gate, has settable 0- to
10-nsec output width with 520-psec, 5V transitions.... [Design Idea by Jim Williams,
Linear Technology Corp] |
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Simple PWM ADC is Surprisingly Accurate - 06/09/94 EDN-Design Ideas....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,.... [Design Idea by Mike Walne, Farnell Instruments, Wetherby,
West Yorkshire, UK] |
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Speed Error in PWM Fan Control Systems TC646, TC647, TC649 - Microchip
Application Note Published 27-Jul-04 (app note added 2/06) |
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Spice Model & PWM Amplifier Applications Apex-AN33 - Apex App Note....
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Square-wave modulator has variable frequency and pulse width - 8-Aug-02
Issue of EDN A few years ago, I worked at a disk-drive company. We had a plating
facility that required square waves to drive the high-voltage plating operation. The
challenge was that the square wave's pulse width had to be variable, along with the
duty cycle. Also, the amplitude of the pulses had to be adjustable.... [Design Idea by
Michael Fisch, Agere Systems, Longmont, CO] |
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Stability & Biasing for PWM Amplifiers Apex-AN41 - Apex App Note....
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Suppressing Acoustic Noise in PWM Fan Speed Control Systems - Microchip
Application Note Published 27-Jul-04 (app note added 2/06) |
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TB085: A Simple Circuit for Driving MicroController Friendly PWM Generators -
Microchip Application Note Published 27-Jun-05 (app note added 2/06)
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TB093: Multiple PWM Output Soft-Start Controller - Microchip Application
Note Published 29-Nov-05 (app note added 2/06) |
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Timer with 555 - Some useful circuits using the LM555 IC. Scroll to find the
Timer with 555 circuit (11/06) |
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Transistor pair lowers PWM IC's start-up current - 03/18/99 Issue of EDN
An auxiliary winding usually provides power for the popular UC384X-based offline
switch-mode power supplies (SMPSs]. This winding feeds the main PWM controller
during steady-state operation. However, the controller always needs a small start-up
current, which clearly plagues the efficiency in very low-power standby SMPSs with
POUT =500 mW, for example. Any wasted source power, such....Page includes several
designs. Scroll to find this one.... [Design Idea by Christophe Basso, Motorola
Semiconductor, Toulouse, France] |
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Unused port adds a PWM/analog channel to a microcontroller - 8-Oct-09 Issue
of EDN Take advantage of unused pins to generate a PWM signal and then filter it
into analog.... [Design Idea by Vishwas Vaidya, Tata Motors Ltd, Pune, India] |
| with either an external
negative-temperature-coefficient thermistor or a PIC microcontroller and its SMBus
serial-data bus.... [Design Idea by Dimitri Danyuk, Niles Audio Corp; Edited by Brad
Thompson and Fran Granville] |
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Using a Function Generator to Create Pulse Width Modulation PWM Waveforms -
Agilent Application Note (added 6/06) |
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Using PWM to Generate Analog Output - Microchip Application Note Published
26-Aug-97 (app note added 2/06) |
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Using the PWM - Microchip Application Note Published 26-Aug-97 (app
note added 2/06) |
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Variable Frequency PWM - Schematic only, no circuit description included….
[Design adapted by Tony van Roon's circuit] |
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Variable Range PWM A/D for COP820CJ - National Semiconductor Application
Note (app note added 2/06) |
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Variations on the PWM DC Motor Speed Control - The diagrams are for 12V
operation only and there are high side (common ground) and low side (common +12V)
versions. The low side version is in fact, identical to the original circuit when
wired for 12V operation. The low side version allows the use of higher power and more
inexpensive N Channel FETs, whereas the high side version, which uses P Channel FETs
is used where common ground load wiring is a requirement. [G. Forrest Cook] |
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Video Design Idea: Leverage PWM output and add a low-cost DAC to your system -
19-Jul-07 Issue of EDN Bonnie Baker demonstrates a simple way to add DAC
functionality to a microcontroller-based system using only an op amp and two passive
components.... [Design Idea by Bonnie Baker, senior applications engineer at Texas
Instruments and regular EDN columnist] |
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Wireless RF PWM Dual Motor Controller - (circuit / schematic design added
6/06) |
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