Two-Resistor Compact Thermal Model Guideline
JESD15-3
JULY 2008
Contents
1 Scope 1
2 Normative references 1
3 Definition of the two-resistor compact thermal model 2
3.1 Overview 2
3.2 General criteria for compact thermal models 2
3.3 The two-resistor methodology 2
3.4 Network model definition 3
4 Determination of the metrics 4
4.1 Junction-to-board thermal resistance (θJB) 4
4.2 Junction-to-case thermal resistance (θJCtop) 4
5 Alternative metrics 5
6 Application Considerations 5
6.1 Overview 5
6.2 Network calculator/spreadsheet-based tools 5
6.3 Three-dimensional modeling and simulation tools 7
6.3.1 Overview 7
6.3.2 Conduction-focused tools 8
6.3.3 Computational fluid dynamics (CFD) tools 8
6.3.4 Representing a two-resistor model in 3D space 9
6.3.4.1 Block-and-plate method 10
6.3.4.2 Block-and-surface resistance method 11
6.3.4.3 Network object method 11
6.4 Accuracy bounds of a two-resistor model 12
7 Methodology for constructing and using two-resistor model 12
7.1 Two-resistor model construction and usage 12
7.2 Example illustrating the use of a two-resistor model 13
8 Bibliography 14
TWO-RESISTOR COMPACT THERMAL MODEL GUIDELINE
Contents (continued)
Figures
1 Two-resistor model network 3
2 Package on PCB 6
3 Equivalent thermal resistance diagram of two-resistor model on PCB 6
4 Thermal resistance diagram of system with known board temperature 6
5 Two-resistor model in conduction-only simulation environment 8
6 Two-resistor model in CFD simulation environment 9
7 Two-resistor model represented in 3D space using a block-and-plate approach 10
8 Two-resistor model represented using a block-and-surface resistance approach 11
9 Two-resistor model as a three-dimensional network object 11
10 Thermal resistance diagram for worked example 13 作者: fluent 时间: 2011-5-1 09:40
