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How to Streamline PCB Thermal DesignApril 1, 2015 | John Parry, Mentor Graphics Corporation
Estimated reading time: 2 minutes
Thermal issues with a PCB design are mostly determined during the component selection and layout phases. After this point, only remedial actions are possible if components are found to run too hot. Addressing thermal issues early in PCB design, starting at the system or enclosure level to understand the flow environment critical for air-cooled electronics, can streamline the process. Assumptions about the airflow uniformity in early design that subsequently prove unachievable can have a disastrous effect on the commercial viability of the product and meeting the market window.
Begin Before Placement and Layout
Substantial work can be done well before layout is completed within the electrical design flow. A simple representation of the enclosure can provide information about the air flow profile over the board. Start by smearing the total board power over the total board surface, which will provide a temperature map that will show any hot regions that are caused by a badly distributed air flow. Treat the board as a block with an isotropic conductivity of between 5 W/mK and 10 W/mK to optimize enclosure-level air flow ahead of the PCB design.
Components inject heat locally into the board so the heat flux density into the board below a component will be higher than the average for the board. As a result, the local board temperature will be higher than that predicted in the simulation. Refine the model before using the board temperature to estimate component temperatures. If the board temperature at any point is close to the maximum component case temperature, this limit will be exceeded once the component heat sources are represented discretely.
Guesstimate Component Power
At this stage, make a best-guess estimate of the individual power budgets for the main heat dissipating components that will be used in the design and the approximate size of those packages. This will enable describing them as footprint heat sources in the simulation, smearing the remainder of heat uniformly over the board surface.
Before Selecting the Package, Use 3D Component Models
Include some form of 3D component model in the simulation before the component selection is finalized. By feeding the thermal results back before this milestone is reached, the thermal performance will more likely be considered in the package selection criteria. Some ICs are available in more than one package style, and not all package styles perform equally well from a thermal point of view. The need for a heatsink later may be eliminated by appropriate package selection.
Component temperature, either in the form of a case temperature or junction temperature depending on how the manufacturer has specified the component, is the key measure used to indicate whether the design is thermally acceptable.
Editor's Note: This article originally appeared in the March issue of SMT Magazine.
Cadence’s digital and custom/analog flows are certified on the Intel 18A process technology. Cadence® design IP supports this node from Intel Foundry, and the corresponding process design kits (PDKs) are delivered to accelerate the development of a wide variety of low-power consumer, high-performance computing (HPC), AI and mobile computing designs.
Intel Corp. (INTC) launched Intel Foundry as a more sustainable systems foundry business designed for the AI era and announced an expanded process roadmap designed to establish leadership into the latter part of this decade.
Keysight, Intel Foundry Partner to Certify Electromagnetic Simulation Software for Intel 18A Process Technology02/22/2024 | BUSINESS WIRE
Keysight Technologies, Inc. announces that the RFPro electromagnetic (EM) simulation software, part of the Keysight EDA Advanced Design System (ADS) integrated tool suite, is now certified by Intel Foundry for design engineers targeting Intel 18A process technology.
I-Connect007 has just released the latest episode of its podcast series, On the Line with..., which focuses on designing for reality in the electronics industry. In this episode, host Nolan Johnson talks with ASC Sunstone VP/Manager Matt Stevenson about CAD tool features and data formats that help designers make better decisions and transfer better designs to manufacturing.
Intel Foundry Services (IFS) and Cadence Design Systems, Inc. (Nasdaq: CDNS) announced they have expanded their partnership and entered into a multiyear strategic agreement to jointly develop a portfolio of key customized IP, optimized design flows and techniques for Intel 18A technology featuring RibbonFET gate-all-around transistors and PowerVia backside power delivery.