Circuits & Schematics Supply - 12

A simple circuit monitors the elapsed time over which a line-connected ac load energizes (Figure 1). You can then access the elapsed-time count over a standard one-wire protocol. When you energize the ac load, the optoisolator provides pulses at ...

Synchronous buck regulators offer high efficiency and are popular in applications in which available input voltages are 12 V or less. However, as input voltage approaches 100 V, wide-range-regulator design becomes more difficult, and the choice of ...

Environmental systems that precipitate dust and carbon particles frequently use high-voltage dc power supplies. However, failure of high-voltage components caused by a change in their properties over time can create a large drop in voltage that ...

Interfacing two systems that operate at two arbitrary voltages is a challenging problem; there is no guarantee that one side operates at a voltage higher than the other side. Usually, the interface is an open-collector or open-drain type with just ...

The circuit in Figure 1 uses a minimal number of external parts to raise the maximum output current of a 0.5 A buck switching-regulator IC to more than 6 A. The circuit accommodates input voltages of 15 to 60 V and delivers output voltages of 3.3, ...

Linear Technology's recently introduced LTC4300 chip buffers I 2 C clock and data lines to and from a hot-swappable card. This task is difficult because the IC must work bidirectionally, meaning that you can simultaneously and actively drive ...

The circuit in Figure 1 uses a typical technique for varying the output voltage of a power supply via a programmable control voltage. Although the topology and schematic details of the power supply are not critical, the protection technique is ...

As one of today's most interesting component families, high-value capacitors offer ratings ranging from tenths to tens of farads but suffer from relatively low working voltages. For example, Maxwell's PC10 ultracapacitor occupies an area ...

The simplest model of a battery comprises an ideal voltage source that connects in series with a resistance whose value often a few milliohms depends on the battery's electrochemical condition and construction. If you attempt to use an ordinary ...

Many amplifiers, including integrated devices, are afflicted with undesired, implicit input terminals in their power connections. Due to less than perfect power-supply rejection, these implicit terminals admit noise into the signal that the ...