Texas Instruments: Achieving A More Compact Power Solutions
This article details the latest development of power supply circuits
. The paper also describes several devices to illustrate the circuit architecture and packaging to promote the progress of smaller power solutions. See more exciting informationArticle details Power supply The latest development of the circuit. The paper also describes several devices to illustrate the circuit architecture and packaging technology advances to promote smaller Power supply Solution.
The different functions into the same Chip A PDA, portable navigation systems (GPS) and intelligent portable devices such as mobile phones trend. Just a few years ago, applications of each group will need a separate power supply converter, but with the Battery Power function of increasingly complex products, power supply design began to change in the product range of power required to integrate has become a trend, in addition to the required processor power, there are Bluetooth modules, wireless network module and screen, etc. Other features also need a separate power supply. In such applications, the power supply can be divided into categories:
With other functions included power supply chips, such as CODEC, ADC, audio amplifier and charger, etc.
A single chip to provide all the required power
Features a dedicated power converter module
This article describes the last two solutions. Functional modules used in the design of a dedicated power converter has several advantages: first, Board Location arrangement of parts more easily, because they can be placed directly on the processor or a wireless network module and other power supply next target. Second, the circuit board layout is more simple, because signals do not cross the entire board. In addition, these power supplies and other circuits will also minimize the coupling between, this GPS module or phase-locked loop (PLL) power supply is particularly important and so sensitive.
This solution for the existing product development plans based on follow-up is also good, because when the engineer to change the product design, they can be confined to changes in the functional module level? Designers simply modify the function of upgrade some of the other circuits remain unchanged; contrast, if the application is only one power chip, engineers must spend more spirit to design the new requirements. As the shortening product development time has become a key to the success of such an obvious form of power supply has a considerable edge.
To provide this solution, power chip must meet several requirements. First, there must be a series of devices provide a variety of power, and its size must be reduced as much as possible to avoid taking up too much board space. Second, these chips should easily match the different needs of different solutions. Texas Instruments (TI) of the TPS6502x and TPS6505x series is an example, these devices are dedicated application processors for handheld devices to provide power. As the different series of processors will have different needs, they also have a dedicated chip to support the particular model or family of processors and application specific.
In general, the use Battery The application will ask the power to a large range of output current to maintain high efficiency, all components of the operation must be optimized for the quiescent current. Quiescent current is the so-called chip does not provide any output current circumstances, to maintain current output voltage required, this parameter must be a long time in standby mode, the application is very important. Low quiescent current standby time not only to extend the application of DC power converter in ultra-low output current efficiency is also greatly affected.
Step-down converter DC-DC converter efficiency will be affected by three factors: the output current is large, mainly by the internal power supply efficiency Switch Impedance of the decision, so this low impedance operating range is important. For a fixed frequency pulse width modulation (PWM) buck converter, the duty cycle is the ratio of input to output voltage decision. Output voltage is very low, the internal bottom of the switch (NMOS) in the lead-time will be much more than the upper switch (PMOS); If the output voltage is high, it becomes the top switch conduction time longer. Therefore, the assumption that all input voltage converters are the same, the designer should aim for the converter output voltage to the size and impedance selector switch; general, portable applications in lithium-ion battery voltage range from 4.2V to about 3.0 V, the future may also be further reduced to 2.5V.
Texas Instruments: Achieving A More Compact Power Solutions
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