SPICE Analog Behavioral Modeling of Variable Passives
May 1, 2005
In this third and final installment, the technique for modeling variable passives in SPICE is applied to inductors. When an inductor is energized, it...

SPICE Analog Behavioral Modeling of Variable Passives
Apr 1, 2005
In part two of this three part article, PET outlines a technique to model variable capacitors....

SPICE Analog Behavioral Modeling of Variable Passives
Mar 1, 2005
Very often when simulating an electrical circuit in SPICE, there is a need for a variable passive element such as a resistor, a capacitor or an inductor....

Continuous Tracking Challenges DC-DC Converters
Feb 1, 2005
Typically, dc-dc converters are designed for use at a fixed output voltage. Some applications, such as dual data rate memory bus and other high-speed logic bus terminations, require the output voltage to be a fixed percentage of an external variable voltage source....

Biasing the TL431 for Improved Output Impedance
Jan 1, 2005
The TL431 is a well-known voltage reference integrated circuit used in Switch-Mode Power Supply (SMPS) feedback loops. Combining a reference voltage and...

Get Rid of the Miller Effect with Zero-Voltage Switching
Nov 1, 2004
When designing power supplies, engineers often focus on the efficiency drop linked to conduction losses of their MOSFET. In the presence of large RMS...

-48-V to 10-V Power Converter Using Push-Pull Topology
Oct 1, 2004
Distributed -48-V power systems often require a positive bias supply rail to power communications and system monitoring circuits. When input-to-output...

Overpower Compensation for Current-Mode Supplies
Sep 1, 2004
A current-mode power supply works by observing the peak current circulating in an inductance. By adjusting the peak current setpoint at which the power...

Reducing Wasted Startup Current in Offline Supplies
Aug 1, 2004
A switch-mode power supply (SMPS) offers a convenient and efficient way to reduce a large input voltage (the ac mains voltage) to power lower-voltage...

Ramp Compensation for Current-Mode Converters
Jul 1, 2004
A peak current-mode power supply is subject to subharmonic oscillations if two conditions are met: the converter operates in the continuous conduction...

Designing Switchmode Transformers for Optimum Efficiency
Jun 1, 2004
Among the first decisions engineers must make when designing a new switchmode power supply are transformer size, working frequency and the selection of...

Implementing Flyback Transformer Design for Continuous Mode
Jun 1, 2003
Using the functional principles of continuous mode of a flyback transformer, Keith Billings looks at the function of an air gap in a ferrite core....

Previous | 1 | 2