Circuits: Supply

1. Regulator IC forms convenient overvoltage detector
   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 ...
   Circuits » Supply » Texas Instruments » TL431, TLV431
   07-11-2018
2. Build a UPS for USB devices
   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 ...
   Circuits » Supply » Maxim » MAX1703
   18-10-2018
3. Negative-to-negative switch-mode converter offers high current and high efficiency
   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 ...
   Circuits » Supply » Maxim » MAX668, MAX4322
   19-09-2018
4. Voltage doubler uses inherent features of push-pull dc/dc converter
   Ajoy Raman EDN This Design Idea presents a minimal-parts-count, wide-range voltage doubler using the inherent voltage-doubling characteristics of a one-transformer push-pull dc/dc converter. The implementation uses a high-voltage Darlington-array ...
   Circuits » Supply » Allegro » ULN2023A
   04-09-2018
5. Switcher regulates HV in novel way
   Gheorghe Plasoianu EDN Designing a high-voltage regulator can pose difficulties associated with component stress, reliability, and costs. This Design Idea offers a solution: a simple unregulated high-voltage supply in series with a low-voltage ...
   Circuits » High Voltage · Supply » Linear Technology » LTC1625
   21-08-2018
6. Reset an SOC only when power is ready
   Goh Ban Hok EDN An SOC (system on chip) normally requires two power supplies one for the core supply and the other for the I/O. To properly power up the chip, you need to get one of the power supplies ready before the other, according to the ...
   Circuits » Supply » Texas Instruments » LM311N, SN74LS08
   08-08-2018
7. Servo loop improves linear-regulator efficiency
   Aurel Gontean EDN Linear regulators are easy to implement and have better noise and drift characteristics than switching approaches. Their largest disadvantage is inefficiency: excess energy dissipated as heat. Several well-known techniques are ...
   Circuits » Supply » Linear Technology » LM2576T, NE5534
   02-08-2018
8. "Unstable" Power Supply Simulates Solar Panel Behavior
   Giovanni Romeo and Giuseppe Urbinilogia Electronic Design This power supply may seem a bit strange, since it’s not stable in voltage or in current. However, it simulates the behavior of a solar panel and can be very useful if you’re ...
   Circuits » Supply · Solar » Analog Devices » ADM660
   23-07-2018
9. Improve efficiency of low-cost switcher
   Peter Demchenko EDN Low-current switching regulator ICs often use a Darlington as the output switch. The power conversion efficiency in this case can be improved with the help of only two cheap components. To make this possible, the chip should ...
   Circuits » Supply » ON Semiconductor » MC34063
   04-07-2018
10. Transistors drive LEDs to light the path
    Eliot Johnston EDN Keeping low-voltage outdoor lights illuminated takes some effort. Bulbs burn out, and connections corrode. HB LEDs (high-brightness light-emitting diodes) seem like acceptable replacements, but most are available only in ...
    Circuits » Supply · Light » Cree » C535A-WJN
    20-06-2018