power supply voltage

ding_di 2015-07-06 04:39:44

IC特性中，供电电压和工作电压，为什么会不同啊，谁知道。
供电电压怎么会有 mix -03mA mxa4.5mA

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ding_di 2015-07-07

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一种控制电流输出的芯片

worldy 2015-07-06

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什么芯片那么牛，估计里面反接了二极管保护我知道的一般是-0.5

ding_di 2015-07-06

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供电电压有一个绝对值 -3V ~4.5V，那个负号表示什么，你是怎么理解

worldy 2015-07-06

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供电电压:你的芯片不会烧坏的电压工作电压:能正常工作的电压

This application note describes the procedure used within the Timing and Synchronization (TSD) division of IDT to analyze the PSNR for its devices. Power supply noise rejection (PSNR) is a measurement of how well a circuit rejects noise from various frequencies which are coupled into the power supply. In actual high speed analog and digital circuitry, the power supply pins are vulnerable to random noise Most customer designs use linear voltage regulators or switching voltage regulators as the power supply for ICs. Linear regulators will almost always get input voltage from a switching DC/DC converter. Therefore, power supply noises in a customer board typically come from the switching noise of the power supply and coupling from other high-frequency sections of the circuit board. Many of the problems facing PCB designers today are related to power supply noise. There are guidelines that can be used to solve simple issue. For more complex issues, a better understanding and consideration of all the parameters will be required to provide a clean solution. For this reason, it is essential to understand the PSNR of the clock devices. This can assist in designing the correct bypassing and decoupling for the system.

PT5139直流电机驱动IC资料，  Wide Power Supply Voltage Range: 2.7V to 15V  Two Internal Full-Bridge Drivers  Internal Charge Pump for the High-Side Driver  Low Quiescent Current: 1.8mA  Low Sleep Current: 1μA  Thermal Shutdown and Under-Voltage Lockout Protection  Over Current Protection (OCP)  Over-Temperature Output Flag  Built-in RF noise filter  Thermally-Enhanced Surface-Mount Package  Low MOSFET On Resistance (HS: 580mΩ; LS: 480 mΩ)

tional amplifiers concerns operation from a single supply voltage. “Can the model OPAxyz be operated from a single supply?” The answer is almost always yes. Operation of op amps from single supply voltages is useful when negative supply voltages are not available. Furthermore, certain applications using high voltage and high current op amps can derive important benefits from single supply operation. Consider the basic op amp connection shown in Figure la. It is powered from a dual supply (also called a balanced or split supply). Note that there is no ground connection to the op amp. In fact, it could be said that the op amp doesn’t know where ground potential is. Ground potential is somewhere between the positive and negative power supply voltages, but the op amp has no electrical connection to tell it exactly where. VIN VOUT = VIN G = +1 +VS = 15V –VS = 15V VIN VOUT = VIN G = 1 +VS = 30V (a) (b) FIGURE 1. A simple unity-gain buffer connection of an op amp illustrates the similarity of split-supply operation (a) to single-supply operation in (b). The circuit shown is connected as a voltage follower, so the output voltage is equal to the input voltage. Of course, there are limits to the ability of the output to follow the input. As the input voltage swings positively, the output at some point near the positive power supply will be unable to follow the input. Similarly the negative output swing will be limited to somewhere close to –VS. A typical op amp might allow output to swing within 2V of the power supply, making it possible to output –13V to +13V with ±15V supplies. Figure 1b shows the same unity-gain follower operated from a single 30V power supply. The op amp still has a total of 30V across the power supply terminals, but in this case it comes from a single positive supply. Operation is otherwise unchanged. The output is capable of following the input as long as the input comes no closer than 2V from either supply terminal of the op amp. The usable range of the circuit shown would be from +2V to +28V. Any op amp would be capable of this type of single-supply operation (with somewhat different swing limits). Why then are some op amps specifically touted for single supply applications? Sometimes, the limit on output swing near ground (the “negative” power supply to the op amp) poses a significant limitation. Figure 1b shows an application where the input signal is referenced to ground. In this case, input signals of less than 2V will not be accurately handled by the op amp. A “single-supply op amp” would handle this particular application more successfully. There are, however, many ways to use a standard op amp in single-supply applications which may lead to better overall performance. The key to these applications is in understanding the limitations of op amps when handling voltages near their power supplies. There are two possible causes for the inability of a standard op amp to function near ground in Figure 1b. They are (1) limited common-mode range and (2) output voltage swing capability. These performance characteristics are easily visualized with the graphical representation shown in Figure 2. The range over which a given op amp properly functions is shown in relationship to the power supply voltage. The commonmode range, for instance, is sometimes shown plotted with respect to another parameter such as temperature. A ±15V supply is assumed in the preparation of this plot, but it is easy to imagine the negative supply as being ground. In Figure 2a, notice that the op amp has a common-mode range of –13V to +13.5V. For voltages on the input terminals of the op amp of more negative than –13V or more positive than +13.5V, the differential input stage ceases to properly function. Similarly, the output stages of the op amp will have limits on output swing close to the supply voltage. This will be loaddependent and perhaps temperature-dependent also. Figure 2b shows output swing ability of an op amp plotted with respect to load current. It shows an output swing capability of –13.8V to +12.8V for a l0kΩ load (approximately ±1mA) at 25°C. ® ©1986 Burr-Brown Corporation AB-067 Printed in U.S.A. March, 1986 SINGLE-SUPPLY OPERATION OF OPERATIONAL AMPLIFIERS SBOA059 One

The choice of using a non-isolated buck converter topology to reduce a distribution voltage to a lower one for point-of-load applications is an easy one. The buck is simple, has relatively few components and may be configured for a wide variety of applications. The choice of how to manage the control of the converter is not quite as straightforward a decision. This topic continues Topic 1: “Choosing the Right Fixed Frequency Buck Regulator Control Strategy” and shifts to the variable frequency realm with discussion of constant on-time control and its enhancements with various versions of the D-CAP architecture. The highlights and challenges for each technique are discussed and select design examples are presented.

The motherboard contains numerous delicate electronic circuits and components which can become damaged as a result of electrostatic discharge (ESD). Prior to installation, carefully read the user's manual and follow these procedures: • Prior to installation, make sure the chassis is suitable for the motherboard. • Prior to installation, do not remove or break motherboard S/N (Serial Number) sticker or warranty sticker provided by your dealer. These stickers are required for warranty validation. • Always remove the AC power by unplugging the power cord from the power outlet before installing or removing the motherboard or other hardware components. • When connecting hardware components to the internal connectors on the motherboard, make sure they are connected tightly and securely. • When handling the motherboard, avoid touching any metal leads or connectors. • It is best to wear an electrostatic discharge (ESD) wrist strap when handling electronic components such as a motherboard, CPU or memory. If you do not have an ESD wrist strap, keep your hands dry and first touch a metal object to eliminate static electricity. • Prior to installing the motherboard, please have it on top of an antistatic pad or within an electrostatic shielding container. • Before connecting or unplugging the power supply cable from the motherboard, make sure the power supply has been turned off. • Before turning on the power, make sure the power supply voltage has been set according to the local voltage standard. • Before using the product, please verify that all cables and power connectors of your hardware components are connected. • To prevent damage to the motherboard, do not allow screws to come in contact with the motherboard circuit or its components. • Make sure there are no leftover screws or metal components placed on the motherboard or within the computer casing. • Do not place the computer system on an uneven surface. • Do not place the computer system in a high-temperature or wet environment. • Turning on the computer power during the installation process can lead to damage to system components as well as physical harm to the user. • If you are uncertain about any installation steps or have a problem related to the use of the product, please consult a certified computer technician. • If you use an adapter, extension power cable, or power strip, ensure to consult with its installation and/or grounding instructions.

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