Thermal Design User Guide: Agilex™ 5 FPGAs and SoCs

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ID 814008
Date 4/01/2024
Public
Document Table of Contents
Document Table of Contents x
1. Introduction to Agilex™ 5 FPGA Thermal Design Guidelines 2. Agilex™ 5 FPGA Mechanical Construction 3. Agilex™ 5 FPGA CTM Construction 4. Power and Thermal Calculator (PTC) 5. General FPGA Thermal Design Considerations 6. Design Examples 7. Heat Sinks 8. Document Revision History for the Thermal Design User Guide: Agilex™ 5 FPGAs A. Agilex™ 5 FPGA Product Keys and Package Drawings
1. Introduction to Agilex™ 5 FPGA Thermal Design Guidelines x
1.1. Definitions of Thermal and Power Terms Used in this Document
2. Agilex™ 5 FPGA Mechanical Construction x
2.1. Built-in Temperature Sensors
2.1. Built-in Temperature Sensors x
2.1.1. Agilex™ 5 FPGA Temperature Rating
3. Agilex™ 5 FPGA CTM Construction x
3.1. CTM File Format 3.2. Thermal Modeling with the CTM 3.3. CTM Top Temperature, TCASE Virtual Sensor 3.4. Obtaining the CTM
4. Power and Thermal Calculator (PTC) x
4.1. PTC Thermal Tab Parameters 4.2. Thermal Analysis with the PTC 4.3. PTC Thermal Tab Calculation Options 4.4. Thermal Resistances and Low Power Devices 4.5. Sensor Temperatures on the PTC Thermal Tab
5. General FPGA Thermal Design Considerations x
5.1. FPGA Power Considerations
5.1. FPGA Power Considerations x
5.1.1. FPGA Maximum Allowed Power Dissipation 5.1.2. Static, Dynamic, and Standby Power
5.1.2. Static, Dynamic, and Standby Power x
5.1.2.1. Future-Proofing an FPGA Thermal Design
6. Design Examples x
6.1. Example 1: Constant Die Power with CFD and TJ-MAX Calculation Mode 6.2. Example 2: Solution with Temperature-Dependent Power 6.3. Example 3: Known Cooling Capacity 6.4. Example 4: Heat Sink Selection
6.1. Example 1: Constant Die Power with CFD and TJ-MAX Calculation Mode x
6.1.1. CFD Results
7. Heat Sinks x
7.1. Attachment Force 7.2. Thermal Interface Material (TIM)
1. Introduction to Agilex™ 5 FPGA Thermal Design Guidelines
2. Agilex™ 5 FPGA Mechanical Construction
3. Agilex™ 5 FPGA CTM Construction
4. Power and Thermal Calculator (PTC)
5. General FPGA Thermal Design Considerations
6. Design Examples
7. Heat Sinks
8. Document Revision History for the Thermal Design User Guide: Agilex™ 5 FPGAs
A. Agilex™ 5 FPGA Product Keys and Package Drawings

4.4. Thermal Resistances and Low Power Devices

The Thermal tab of the PTC calculates the power dissipation of the die.

The PTC has no knowledge of the board conductivity or other components near the FPGA; hence, in its calculation of thermal parameters, the PTC assumes that all power and heat is dissipated through the top of the device, to the ambient surroundings. This assumption can be fairly accurate when dealing with an FPGA dissipating more than 5 W, but in lower-power FPGAs, a larger percentage of the total power can be dissipated through the circuit board.

Dissipation through the circuit board can affect the calculation of ΨCA and ambient temperature, but not the TCASE calculation. For this reason, the TCASE calculation can be conservative. Consequently, in cases with low-power FPGAs, Intel recommends using the CTM and CFD for your thermal analysis. This approach better captures the heat dissipated through the circuit board and provides a TCASE value that can be compared with the PTC results and eventually help with design of an optimized cooling solution.

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