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Extend the Wide Output Voltage Capability of
Extend the Wide Output Voltage Capability of

DS1220AB/AD 16k Nonvolatile SRAM
DS1220AB/AD 16k Nonvolatile SRAM

... 2. OE = VIH or VIL. If OE = VIH during write cycle, the output buffers remain in a high-impedance state. 3. tWP is specified as the logical AND of CE and WE . tWP is measured from the latter of CE or CE going low to the earlier of CE or WE going high. 4. tDS is measured from the earlier of CE or WE ...
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... for a moment. Do not exceed any of these ratings.Exceeding the rating(s) may cause device breakdown, damage or deterioration, and may result in injury by explosion or combustion. (2) Do not insert devices in the wrong orientation or incorrectly.Make sure that the positive and negative terminals of p ...
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TPS54325 数据资料 dataSheet 下载

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Single-stage, single-switch input-current

... discontinuous conduction mode (DCM) or in the continuous conduction mode (CCM). Generally, the CCM operation offers a slightly higher efficiency compared to the DCM operation. However, the DCM operation gives a lower total harmonic distortion (THD) of the line current compared to that of the CCM ope ...
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NCP1207A, NCP1207B PWM Current

Aalborg Universitet Improved control strategy for the three-phase grid-connected inverter
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MAX44281 Ultra-Small, Ultra-Thin, 4-Bump Op Amp General Description Benefits and Features

... The MAX44281 is stable for a range of capacitive loads to above 400pF. Adding a series resistor between the output and the load capacitor improves the circuit’s response by isolating the load capacitance from the op amp’s output. See the Isolation Resistance vs. Capacitive-Load Stability graph in th ...
Effectiveness of Using Supply Voltage as Back
Effectiveness of Using Supply Voltage as Back

... with undoped body for MEDICI simulations. The back-gate insulator thickness (3nm) was chosen to be 1.5 times the front-gate insulator thickness (2nm) for low drain-to-backgate capacitance and effective tuning of Vt. The front gate has a work function same as n+ silicon while the back gate has a work ...
PNIMNiPE_nr56 - Instytut Maszyn, Napędów i Pomiarów
PNIMNiPE_nr56 - Instytut Maszyn, Napędów i Pomiarów

... the rotor rotates with higher no-load and rated speed. The motor’s magnetic field rotates with synchronous speed about 377 rad/s, compared to about 314 rad/s for the line frequency 50 Hz. In addition to the average angular velocity, the line frequency influences also the shape of the rotating magnet ...
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... electronics and digital control technology, the DG systems can now be actively controlled to enhance the system operation with improved PQ at PCC. However, the extensive use of power electronics based equipment and non-linear loads at PCC generate harmonic currents, which may deteriorate the quality ...
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... to control the reactive power and voltage to be within acceptable limits. The expert system (ES) techniques [7] are applied to identify the system operating conditions, detect the bus or buses at which certain constraints have been violated, and select the appropriate control actions to alleviate th ...
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... delta wiring configuration. Now we'll take a look at the effect of the monitored values, depending on what side of the transformer you are connected to, as well as some other effects from different configurations. The most common type of power quality disturbance is the sag, a temporary reduction in ...


... In recent general purpose (GPD) and servo drive systems, Hall Effect sensors are often used for current measurement. Two types of single-phase Hall Effect sensors are offered on the market: The more expensive but faster closed-loop sensors and for low-cost solutions the slower openloop types. Both t ...
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Analog and Mixed Signal Circuits On Digital CMOS Processes

... monitoring. Changes in threshold voltages, matching of elements on a common wafer need to be carefully analyzed, so the designer knows the variance that must be compensated for. Minimum geometry elements are used for logic designs. These are often not acceptable for analog signal processing. Paramet ...
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AD629 数据手册DataSheet 下载

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Pulse-width modulation



Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being MPPT.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible. Typically switching has to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on.The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel.
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