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reSiStorS 101
reSiStorS 101

... What is a Resistor? • The resistor is the most common and well-known of the passive electrical components. A resistor resists or limits the flow of electric current in a circuit. There are many uses for resistors: they are used to drop voltage, limit current, attenuate signals, act as heaters, act a ...
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LTC6905.pdf
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... Note 2: Frequency accuracy is defined as the deviation from the fOSC equation. Accuracy is tested with DIV = V+, N = 1 and other divide ratios are guaranteed by design. Note 3: Jitter is the ratio of the peak-to-peak distribution of the period to the mean of the period. This specification is based o ...
W. Li and D.J. Perreault, “Switched-Capacitor Step-Down Rectifier for Low-Voltage Power Conversion,” 2013 IEEE Applied Power Electronics Conference , pp. 1884-1891, March 2013.
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... MAX994 single/dual/quad micropower comparators feature low-voltage operation and rail-to-rail inputs and outputs. Their operating voltages range from 2.5V to 5.5V, making them ideal for both 3V and 5V systems. These comparators also operate with ±1.25V to ±2.75V dual supplies. They consume only 11µA ...
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... generates the ON-OFF driving signal for the switch S after the comparison with a reference current Iref where Iref = Vref/ R5 (see Fig. 1). While S is ON , i(t) increases until reaches the value of Iref. Then, S is turned OFF and remains OFF until the next cycle begins. Note that the proposed boost ...
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Switched-mode power supply



A switched-mode power supply (switching-mode power supply, switch-mode power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a source, like mains power, to a load, such as a personal computer, while converting voltage and current characteristics. Unlike a linear power supply, the pass transistor of a switching-mode supply continually switches between low-dissipation, full-on and full-off states, and spends very little time in the high dissipation transitions, which minimizes wasted energy. Ideally, a switched-mode power supply dissipates no power. Voltage regulation is achieved by varying the ratio of on-to-off time. In contrast, a linear power supply regulates the output voltage by continually dissipating power in the pass transistor. This higher power conversion efficiency is an important advantage of a switched-mode power supply. Switched-mode power supplies may also be substantially smaller and lighter than a linear supply due to the smaller transformer size and weight.Switching regulators are used as replacements for linear regulators when higher efficiency, smaller size or lighter weight are required. They are, however, more complicated; their switching currents can cause electrical noise problems if not carefully suppressed, and simple designs may have a poor power factor.
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