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AP133
AP133

... Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. This cycling limits the heat dissipation of the regulator, protecting it from damage due to overheating. ...
HMC641 数据资料DataSheet下载
HMC641 数据资料DataSheet下载

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AD628 High Common-Mode Voltage, Programmable Gain

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Datasheet - Mouser Electronics

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The Oscilloscope and the Function Generator:

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Emergency Voltage Stability Controls: An Overview

... One important aspect regarding voltage stability and collapse should be discussed at this point. In assessing the security of an operating point, voltage level is generally not a good indicator. Indeed in modern power systems various controls hold voltages close to their nominal values even very clo ...
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TIP47/TIP48/TIP49/TIP50 NPN Silicon Transistor T IP

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... II. GENERAL DESCRIPTION The general conversion scheme is presented in Fig. 1. When the conversion process begins the input signal is sampled, afterwards the input voltage value is compared to a set of pre defined references. For an ADC without redundancy the referred comparison allows the circuitry ...
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... ELECTRICAL CHARACTERISTICS —Single +5V Supply (continued) (V+ = +4.5V to +5.5V, VINH = 2.4V, VINL = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) ...
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... value of the feedback capacitor. If the shunt capacitor is required, attention should be paid to the fact that both the feedback capacitor and the shunt capacitor are connected in series to ground. And the series capacitance of these two capacitors is directly connected, in parallel, to the resonant ...
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... reactive power. Therefore system will show voltage instability. If additional sources provide sufficient reactive power support, the system will be established in a stable voltage level. However, sometimes there are not sufficient reactive power resources and excessive demand of reactive power can l ...
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LT8608 - 42V, 1.5A Synchronous Step-Down

... can be floated to use pulse-skipping mode. If a clock is applied to the SYNC pin the part will synchronize to an external clock frequency and operate in pulse-skipping mode. While in pulse-skipping mode the oscillator operates continuously and positive SW transitions are aligned to the clock. During ...
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ADN4668 数据手册DataSheet 下载
ADN4668 数据手册DataSheet 下载

... powers down the device when EN is high. Receiver Channel 4 Output (3 V TTL/CMOS). If the differential input voltage between RIN4+ and RIN4− is positive, this output is high. If the differential input voltage is negative, this output is low. Receiver Channel 3 Output (3 V TTL/CMOS). If the differenti ...
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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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