Circuits & Schematics Supply - 17

High efficiency and, hence, low loss is a usual design goal for a PWM circuit. Figure 1 shows one of several channels of low-loss PWM control for hydraulic valves used in heavy industrial machinery. These valves usually have dc resistance of ...

For many applications that require power-supply currents of a few amperes or less, three-terminal adjustable-output linear voltage regulators, such as LM317 , offer ease of use, low cost, and full on-chip overload protection. The addition of a few ...

You can use monolithic linear regulators at currents lower than 5 A for most applications. Most manufacturers of these devices integrate current-limiting and thermal shutdown to prevent damage during fault conditions. For currents greater than 5 A, ...

I recently got an assignment to design a battery charger. I decided to use the BQ2000TSN from Texas Instruments because of its versatility in battery chemistry. In my case the battery charger is used to charge a Lithium-ion battery pack. The BQ2000 ...

For a variety of reasons, designers often discover that their creations need yet more power-supply voltages. For example, a system powered by 2.5 V power supplies suddenly needs a precision 1.4 V reference for a signal-level-shifting circuit and ...

Digitally controlled potentiometers are useful for generating analog control voltages under the control of a microcontroller. In some applications, manual pushbutton switches could replace a microcontroller and simplify product design. Mechanical ...

Taking only a cursory look at the input-voltage ratings of your power-supply IC can limit the usable input-voltage range. With careful examination of an IC's operating specifications and circuit topology, you may be able to work around that ...

Do you sometimes need an inexpensive precision power supply? This Design Idea presents a precision power supply that has thermal overload protection and short circuit protection, and can supply 100 mA of current. I needed such a power supply, and I ...

The ATtiny45/85 USB Phone Charge Guard controls and monitors the charging of phones and other devices (Figure 1). Voltage, current, power and energy are constantly measured via the INA219 and compared with the user limit values. It cuts off the ...

Over the years, various power-off circuits have been published. However, the circuit proposed here is very simple and has excellent characteristics. It features a fast power-off transition, with only 8 mV voltage drop at power on and sub-µA ...