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Pulse Width Modulators (PWM)

Active clamp/reset PWM IC becomes more versatile: 06/26/03  EDN-Design Ideas / 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...

Cheap PWM IC Makes Synchronous Gate Driver: 02/04/99 EDN-Design Ideas  / PDF contains multiple circuits - scroll to find circuit.

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 .....

DC to Pulse Width Modulator: This control circuit is suitable for the accurate control of DC motors, lighting levels, small heaters as well as other applications. The circuit converts a DC voltage into a series of pulses, such that the pulse duration is directly proportional to the value of the DC voltage. This circuit can operate with 8-35VDC and control up to 6.5A current. The control voltage is adjustable (can be tuned for0-10-Volt DC).

Eight Channel Eight Bit PWM Controller: National Semiconductor Application Notes,05-Aug-1995

Linear, MicroPower Pulse Width Modulator:

MicroPower Pulse Width Modulator:

Modulator's Design Cuts FPGA's Gate Count: 01/06/94 EDN-Design Ideas / The pulse-width modulator (PWM) macro in Fig1 requires only half as much logic as a conventional2-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.

One Shot Remembers Input Pulse Width: 07/18/96  EDN-Design Ideas 

PCB Drill Controller: The speed controller in this article overcomes this problem by raising the voltage to the drill as the load is increased. The unit uses a basic Pulse Width Modulation (PWM) regulator to reduce the power dissipation.

PLD Adds PWM SoftStart Function To Switching Power Supplies : 07/08/02 Electronic Design - Ideas for Design / Switching converters sometimes use soft-start circuitry to reduce the large in-rush current that occurs when they first turn on. By employing a PLD, soft start can be added to power-supply controllers that don't natively support this function, but...  

PLD code creates PWM generators: 08/08/2002  EDN - Design Ideas / The PLD (programmable-logic-device) code in Listing 1 creates arbitrary-resolution, pulse-width-modulated (PWM) generators. PWM generators are useful as low-bandwidth D/A converters in hardware of microprocessor-based systems. When you pass it through a simple RC lowpass filter, a PWM waveform becomes a voltage that's approximately equal to the PWM duty cycle times the supply voltage..

Provide 4  to 20 MPWM Control: 09/01/98 EDN-Design Ideas / Are useful when you use4- to20-mA current-loop signals to control a PWM signal

Pulse Width Modulation DC Motor Control: controls the motor speed by driving the motor with short pulses

Pulse Width Modulators: generating PWM waveform is extremely simple with the circuits shown in this page

Pulse Width to Voltage Converter:

PWM Circuit uses one OpAmp: 07/06/00 EDN-Design Ideas / circuit delivers a rectangular signal with duty cycle varying between0 and100% in response to an input signal varying from0 to5V dc

PWM Controller: 555 Timer based PWM motor control project for electric fan or other DC motor

PWM DC Motor Speed Control:

PWM Motor / Light Controller Variations: diagrams are for12V operation and there are high side (common ground) and low side (common +12V) versions

PWM Speed Control: includes theory and some example circuits

PWM Watchdog Circuit Ensures upper Bounds: 11/07/96 EDN-Design Ideas

Simple Circuit Provides Efficient PWM: 02/18/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

Simple PWM ADC is Surprisingly Accurate: 06/09/94 EDN-Design Ideas

Simple PWM Signal Generator Suits Backlight LCD Applications : 04/15/02 Electronic Design - Ideas for Design / In LCD backlight applications, a dc-to-ac inverter drives cold-cathode fluorescent lamps. The inverter's input comes from the display's power supply. Currently, it spans from 12 to 18 V. Pulse-width modulation (PWM) dimming, or digital dimming, can...  

Transistor pair lowers PWM IC's start up current: 03/18/99 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit

Variations on the PWM DC Motor Speed Control:

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