This guide serves as an aggregation of all of the most critical technical documents for engineers designing with TI’s DC/DC buck regulator portfolio. This chapter will discuss five important topics for designers: (1) DC resistance of traces (2) AC impedance (3) a general rule-of-thumb decoupling method (4) an analytic decoupling method and (5) how to make design tradeoffs to achieve the best noise performance possible. The portfolio is supported by WEBENCH® Designer software, evaluation modules, and a variety of technical resources, leading to shorter design cycles and a faster time-to-market. This circuit is designed with two filter capacitors namely C1 and C2 and a choke mentioned with ‘L’. Also, component manufacturers always provide development platforms for designers to evaluate and these platforms typically are a lot larger than the actual design and are not required to be FCC certified, so copying what was done on the development platform is not a guarantee that the design will be successful. The pi filter circuit design is shown below. In general, component manufacturers provide a conservative recommendation for power supply decoupling, but in many cases, it is not practical to follow this recommendation because of PCB space availability, power consumption, EMI, or safety requirements. One of the most challenging tasks for designers is to determine the best decoupling techniques to achieve low noise and high performance. These include DC resistance of PCB traces or power/ground planes, AC impedance of PCB traces, power supply decoupling around the DSP, and or other surrounding circuits such as DDR, clocks, and analog-to-digital and digital-to-analog converters. These types of filters are sometimes referred to as pi () or T. The disad- vantage of a larger filter is that physical size increases. Second Order Filters A third-order filter, of course, consists of three or more re-active elements as shown in Figure 4. These types of filters are sometimes referred to as pi () or T filters. ![]() This is because there are too many things that could affect power delivery to multiple devices on a system. must be considered, and involves a design characteristic called damping factor which describes gain and the time response of the filter. Poor power integrity is one of the most common root causes of system-related problems.
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