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Chapter 5 – Series Circuits
Chapter 5 – Series Circuits

...  Voltage across the internal resistance lowers the source output voltage when a load is connected.  For any chosen interval of voltage or current, the magnitude of the internal resistance is given by ...
Chapter 5 – Series Circuits
Chapter 5 – Series Circuits

...  Voltage across the internal resistance lowers the source output voltage when a load is connected.  For any chosen interval of voltage or current, the magnitude of the internal resistance is given by ...
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HMC722LC3C 数据资料DataSheet下载

... The HMC722LC3C is an AND/NAND/OR/NOR function designed to support data transmission rates of up to 13 Gbps, and clock frequencies as high as 13 GHz. The HMC772LC3C may be easily configured to provide any of the following logic functions: AND, NAND, OR and NOR. The HMC722LC3C also features an output ...
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... First of all, use the largest supply voltage available (±15V or +30V is convenient). This will minimize VBE mismatch problems and allow a wide variation of voltage on pin 8. The potential on pin 8 may be swept from VCC (and slightly higher) to 2/3 VCC +2V) where VCC is the total voltage across the 8 ...
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< 1 ... 1987 1988 1989 1990 1991 1992 1993 1994 1995 ... 2646 >

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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