Wayne Rewinkel EDN This charge-pump circuit quietly converts a 3.3 V source to 5 V at 500 mA (Figure 1 and Figure 2). LM4871LD power amplifier makes this design idea both possible and practical, thanks to its low output resistance, low cost, ...
10-12-2018
Hua (Walker) Bai Electronic Design LED applications are booming: backlighting for LCD TVs, projectors, and computer displays, camera flashes, and vehicle brake lights and taillights are just a few. All require constant-current LED drivers that ...
27-11-2018
Ausias Garrigós and José M Blanes EDN Designers use electronic dc loads for testing power supplies and sources, such as solar arrays or batteries, but commercial ones are often expensive. By using a power MOSFET in its linear region, ...
27-11-2018
Robert Bell EDN Figure 1 shows a simple, stand-alone overvoltage detector. The intent of the circuit is to monitor a voltage, V MON , and set the output, V OUT , high when the monitored voltage exceeds a preset threshold. The minimum allowable ...
07-11-2018
Mark Cherry EDN Portable systems often include circuitry that derives power from an external source, such as USB. When the system disconnects from the USB supply, a battery takes over and supplies current via a dc/dc converter. A diode-OR ...
18-10-2018
Martin Rowe EDN When converting a negative-output power supply to one with less-negative output, you must ensure that variations in input voltage don’t affect the output voltage. All such supplies include an internal reference voltage that ...
19-09-2018