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Buffer amplifier and LED improve PWM power controller's low load operation
- 15-Sep-05 Issue of EDN PWM IC is enhanced with discrete
components for wider-range operation.... [Design Idea by Gregory Mirsky,
LaMarche Manufacturing Co, Des Plaines, IL; Edited by Brad Thompson and Fran
Granville] |
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Build a simple complementary-bracket-pulse generator - 20-Aug-09
Issue of EDN When building push-pull switching power converters or
motor controllers, you often need alternating pulses with .... [Design Idea
by Horst Koelzow, Global Thermoelectric, Calgary, AB, Canada] |
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CD4093 Pulse Width Modulator - The IC used is a CMOS type MC14093,
a quad 2-input NAND Schmitt trigger. If you wish, it can be directly
interchanged with the CMOS MC14011 but this type is noisy.The speed is
adjustable from 0-max. Max rpm is 2/3 the supply voltage.…. [Tony van Roon's
circuit] |
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Cheap PWM IC makes synchronous gate driver - 02/04/99 Issue of EDN
A system with a µP, memory, and peripherals usually requires several
power-supply voltages. Designers typically use local switching regulators to
produce the desired voltage rails. One of the most.... [Design Idea by
Dimitry Goder, Switch Power Inc, Campbell, CA] |
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Circuit converts pulse width to voltage - 25-Oct-01 Issue of EDN The
circuit in Figure 1 converts pulse information to a clean dc voltage by the end of a
single incoming pulse. In another technique, an RC filter can convert a PWM signal to
an averaged dc voltage, but this method is slow in responding. Converting
low-duty-cycle pulse information is slower yet.... [Design Idea by James Mahoney,
Linear Technology Corp, Milpitas, CA] |
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Circuit Converts Pulse Width to Voltage #2 - 10/28/99 EDN-Design
Ideas....The circuit is optimized for a positive-going pulse width of1 to2 msec,
repeating at intervals of approximately17 msec. The output produces a voltage of0.95V
for a1-msec pulse to2.25V for a2-msec pulse.... EDN is migrating links. This link is
not verified. Google the "title" EDN for new link. |
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Circuit for Driving MicroController Friendly PWM Generators - Microchip
Application Note Published 27-Jun-05 (app note added 2/06) |
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Circuit Provides Efficient PWM - 02/18/99 EDN-Design Ideas....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
and a comparator. The circuit compares the ramp to an externally applied voltage,
VCNTRL.... EDN is migrating links. This link is not verified. Search the "title"
EDN for new link. |
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Circuit sequences supplies for FPGAs - 23-Jan-03 Issue of EDN System
designers must consider the timing and voltage differences between core and I/O power
supplies (in other words, power-supply sequencing] during power-up and power-down. The
possibility of a latch-up failure or excessive current draw exists when power-supply
sequencing does not occur properly. The trigger for latch-up may occur if power
supplies apply different potentials to the core and.... [Design Idea by David Daniels,
Texas Instruments, Dallas, TX] |
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Circuits provide 4- to 20-mA PWM control - 09/01/98 EDN-Design Ideas....The
circuits in Figure 1 and Figure 3 are useful when you use 4- to 20-mA
current-loop signals to control a PWM signal. In both circuits, the minimum pulse
width (corresponding to a 4-mA loop current) and the maximum pulse width
(corresponding to a 20-mA loop current) are independently....File has many circuits,
scroll down.... [Design Idea by Tom Gay, Darmstadt, Germany] |
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Computer Controlled PWM Circuit -
There are times when you wish to control a
pulse width modulation (PWM) signal with a DC voltage, ranging from 0v to 5v. This
voltage is often created by a computer interface. The circuit below performs
this voltage to PWM conversion. PWM signals are often used to control the speed of DC
motors and can also be used to control LED lamp light intensity....[Designed by David
Johnson, PE] |
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Current mirror improves PWM regulator’s performance - 1-Mar-07 Issue of EDN
Reduce Miller Effect to enhance an SMPS' performance and reduce component count....
[Design Idea by Grant Smith, National Semiconductor, Phoenix, AZ; Edited by Brad
Thompson and Fran Granville] |
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DDS circuit generates precise PWM waveforms - 2-Oct-03 Issue of EDN
Pulse-width modulation is a simple way to modulate, or change, a square wave. In its
basic form, the duty cycle of the square wave changes according to some input. The
duty cycle is the ratio of high and low times in the square wave. A waveform with a
50% duty cycle would be high for 50% of the time and low for 50% of the time, and a
waveform with a 10% duty cycle would be high for 10% and low.... [Design Idea by Colm
Slattery, Analog Devices, Limerick, Ireland] |
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Eight Channel Eight Bit PWM Controller - National Semiconductor Application
Note 05-Aug-1995 (app note added 8/02) |
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Embedding Temperature Information in the ADXL202's PWM Outputs - AN-600
Analog Devices Application Notes....[App Note] |
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Fast-settling synchronous-PWM-DAC filter has almost no ripple - 1-May-08
Issue of EDN An inexpensive, high-resoultion DAC uses a synchronous output
filter that settles in one PWM cycle.... [Design Idea by W Stephen Woodward, Chapel
Hill, NC] |
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FET biasing targets battery-powered PWM applications - 21-Nov-05 Issue of
EDN Reference provides constant bias voltage regardless of supply-voltage
variations.... [Design Idea by Steve Franks, Franks Development LLC, Tucson, AZ;
Edited by Brad Thompson and Fran Granville] |
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Frequency & Resolution Options for PWM Outputs - Microchip Application Note
Published 26-Aug-97 (app note added 2/06) |
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Fuel Injector Pulse Width Monitor - (circuit / schematic design added 6/06)
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Green Current Mode PWM Controller FAN7601/ AN-4129 - Fairchild Application
Notes / (app note added 6/06) |
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Handheld DMM copes with logic nanosecond-pulse-width waveforms - 20-Aug-09
Issue of EDN When testing sequential-logic circuits, you may find that, although
the repetition frequency of a logic signal is within the range of your DMM (digital
multimeter], you can’t measure it. The displayed frequency value is either dubious or
chaotically changing in time. The DMM may also behave as if there were no signal....
[Design Idea by Marián Stofka, Slovak University of Technology, Bratislava, Slovakia] |
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H-Bridge with PWM - This circuit drives a motor clockwise / anticlockwise
via a pot and reduces the speed to zero when the pot is in mid-position. The current
is limited to 200mA and the voltage across the motor is less than 6v, but the circuit
shows the principle of Pulse Width Modulation (providing powerful bursts of current to
the motor to create a high or low RPM under load) and both forward / reverse RPM via
the H-bridge arrangement. |
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Heater Fan Controller -
This device acts as a variable speed control for the heater blower in a car. It takes
its power directly from the existing wiring and connects with just 2 wires…. [Luhan
Monat - Mesa Arizona] |
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High side PWM Motor/Light Controller - These two schematics are variations
on another PWM circuit that I designed. 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.... [Circuit Designed by G. Forrest Cook] |
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Hydrogen Generator PWM Circuit - ….(electronic schematic added
12/08) |
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Leverage PWM output & add a low-cost DAC to your system - 07/19/07 Video
Design Ideas-EDN Bonnie Baker, senior applications engineer at Texas Instruments and
regular EDN columnist, demonstrates a simple way to add DAC functionality to a
microcontroller-based system using only an op amp and two passive components.
(electronic Design Idea added 9/08] EDN is migrating links. This link is not verified.
Google the "title" EDN for new link. |
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Light Controller High Side - Diagrams are for12V operation and there are
high side (common ground) and low side (common +12V) versions…. [Designed by G.
Forrest Cook] |
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Light Controller Low Side - Diagrams are for12V operation and there are high
side (common ground) and low side (common +12V) versions…. [Designed by G. Forrest
Cook] |
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Li-Ion Charge Termination IC Interfaces with PWM Switchers - DN242
Design Notes (Linear Technology) (app note added 2/06) |
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LM324 Pulse Width Modulator - Schematic only, no circuits description….
[Tony van Roon's circuit] |
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Low side PWM Motor/Light Controller - These two schematics are variations on
another PWM circuit that I designed. 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.... [Circuit Designed by G. Forrest Cook] |
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Low-power PWM circuit is simple inexpensive - 01/06/00 EDN-Design Ideas....A
common technique for implementing PWM involves comparing a triangular waveform of
fixed amplitude and frequency with a variable dc voltage level. Although this approach
results in a PWM signal of precise frequency and with duty cycle variable from 0 to
100%, the need for a reference triangle waveform and a suitable fast comparator can be
prohibitively.... [Design Idea by Anthony Smith, Scitech, Biddenham, England] |
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Make a DAC with a microcontroller's PWM timer - 5-Sep-02 Issue of EDN
Many embedded-microcontroller applications require generation of analog signals. An
integrated or stand-alone DAC fills the role. However, you can often use PWM signals
for generating the required analog signals. You can use PWM signals to create both dc
and ac analog signals. This Design Idea shows how to use a PWM timer to
simultaneously create a sinusoid, a ramp, and a dc voltage.... [Design Idea by Mike
Mitchell, Texas Instruments Inc] |
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Modulator's Design Cuts FPGA's Gate Count - 01/06/94 Issue of EDN-Design
Ideas....The pulse-width modulator (PWM]macro in Fig 1 requires only half as much
logic as a conventional 2-counter design. With the help of extra logic, a synchronous,
loadable up/down counter can encode information in the duty cycle of a
constant-frequency, constant-amplitude signal.... [Design Idea by Bernie New, Xilinx,
San Jose, CA] |
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Motor PWM - The speed of a motor can be adjusted by this circuit, from 5% to
95%. |
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Multiple PWM Output Soft-Start Controller - Microchip Application Note
Published 29-Nov-05 (app note added 2/06) |
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NE555 Pulse Width Modulator - This circuit is capable of regulating 12V
motors and DC light bulbs. No coolrib required for Q1 or D3 if the current does not
exceed 2A. If it does, a sufficient coolrib for both the Schottky Diode (D3) and
MosFET Q1 is required.…. [Tony van Roon's circuit] |
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One-shot Remembers Input Pulse Width - 07/18/96 EDN-Design
Ideas.... The circuit in Figure 1a remembers the width of an input pulse at the in
terminal. After the input pulse returns to zero, a trigger input causes an output
pulse to occur at the out terminal. This output pulse is proportional to the
width of the input pulse. R2 and R3 set this pulse-width ratio. For the values shown,
the output pulse is half.... EDN is migrating links. This link is not verified.
Google the "title" EDN for new link. |
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