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Buffer Amplifier & LED Improve PWM Power Controller's Low Load Operation -
09/15/05 EDN-Design Ideas: PWM IC is enhanced with discrete components for wider-range
operation.....(design idea added 3/06) |
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Build a simple complementary-bracket-pulse generator - 08/20/09 EDN-Design Ideas:
Gaps between pulses minimize power consumption.....(design idea added 08/09) |
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CD4093 Pulse Width Modulator - (Tony van Roon's schematic / circuit added 08/09) |
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Cheap PWM IC Makes Synchronous Gate Driver - 02/04/99 EDN-Design Ideas: 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 common topologies, the synchronous buck regulator, converts a 5
or 12V bus to some other, lower voltage.....(design idea added 6/03) |
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10/25/01 EDN-Design
Ideas: 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 added 1/05) |
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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.....(design idea added 6/06) |
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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.
When VCNTRL is greater than the ramp voltage, the PWM output is 5V. The sawtooth
oscillator consists of a current source (R1, R2, R3, and Q1), a timing capacitor (C1),
and the oscillator-control circuitry (R4, R5, R6, and IC1A). The oscillator-control
circuitry sets the upper and lower voltages of the timing capacitor at 3 and
1V.....(design idea added 6/03) |
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Circuit sequences supplies for FPGAs - 01/23/03 EDN-Design Ideas: 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 added 10/03) |
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Circuits provide 4 to 20 mA PWM control - 09/01/98 EDN-Design Ideas: (design idea
added 2/06) |
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Current mirror improves PWM regulator’s performance - 03/01/07 EDN-Design Ideas:
Reduce Miller Effect to enhance an SMPS' performance and reduce component
count.....(design idea added 9/08) |
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DDS circuit generates precise PWM Waveforms - 10/02/03 EDN-Design Ideas:
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 added
1/05) |
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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 added 6/06) |
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Fast settling synchronous PWM DAC filter has almost no ripple - 05/01/08 EDN-Design
Ideas: An inexpensive, high-resoultion DAC uses a synchronous output filter that
settles in one PWM cycle.....(design idea added 09/08) |
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FET biasing targets battery powered PWM applications - 11/21/05 EDN-Design Ideas:
Reference provides constant bias voltage regardless of supply-voltage
variations.....(design idea added 02/07) |
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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 - 08/20/09 EDN-Design
Ideas: (design idea added 08/09 |
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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 - (Video Design Ideas- EDN,
7/19/07) -- 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) |
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Light Controller Variations - Diagrams are for12V operation and there are high
side (common ground) and low side (common +12V) versions (added 5/02) |
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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 - (Tony van Roon's circuit design added 08/09) |
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Low power PWM circuit is simple inexpensive - 01/06/00 EDN-Design
Ideas:.....(design idea added 2/06) |
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Make a DAC with a MicroController's PWM Timer - 09/05/02 EDN-Design Ideas:
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 added 1/05) |
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Modulator's Design Cuts FPGA's Gate Count - 01/06/94 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 added 3/03) |
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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 - (Tony van Roon's circuit added 9/04) |
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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.....(design idea added 6/03) |
