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| Si4483EDY_RC Vishay Siliconix R-C Thermal Model Parameters DESCRIPTION The parametric values in the R-C thermal model have been derived using curve-fitting techniques. These techniques are described in "A Simple Method of Generating Thermal Models for a Power MOSFET"[1]. When implemented in P-Spice, these values have matching characteristic curves to the Single Pulse Transient Thermal Impedance curves for the MOSFET. R-C values for the electrical circuit in the Foster/Tank and Cauer/Filter configurations are included. Note: For a detailed explanation of implementing these values in P-SPICE, refer to Application Note AN609 Thermal Simulations Of Power MOSFETs on P-SPICE Platform. R-C THERMAL MODEL FOR TANK CONFIGURATION R-C VALUES FOR TANK CONFIGURATION Thermal Resistance (C/W) Junction to RT1 RT2 RT3 RT4 Junction to CT1 CT2 CT3 CT4 Ambient 4.9280 26.4288 26.4135 27.3492 Ambient 7.0702 m 45.4725 m 1.8744 4.2541 Case N/A N/A N/A N/A Case N/A N/A N/A N/A Foot 536.3249 m 4.6553 10.1038 5.6867 Foot 644.2123 65.5331 m 157.8483 m 10.8807 m Thermal Capacitance (Joules/C) This document is intended as a SPICE modeling guideline and does not constitute a commercial product data sheet. Designers should refer to the appropriate data sheet of the same number for guaranteed specification limits. Document Number: 74105 Revision 01-Sep-05 www.vishay.com 1 Si4483EDY_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (C/W) Junction to RF1 RF2 RF3 RF4 Junction to CF1 CF2 CF3 CF4 Note: NA indicates not applicable Ambient 2.6273 27.5087 23.0822 31.8094 Ambient 1.0532 m 30.2590 m 783.3855 m 1.7732 Case N/A N/A N/A N/A Case N/A N/A N/A N/A Foot 2.7852 8.1195 5.8581 4.2091 Foot 3.5316 m 10.7913 m 104.4945 m 59.3930 m Thermal Capacitance (Joules/C) Reference: [1] "A Simple Method of Generating Thermal Models for a Power MOSFET" by Wharton McDaniel and Kandarp Pandya, IEEE / SEMITHERM 2002 www.vishay.com 2 Document Number: 74105 Revision 01-Sep-05 Si4483EDY_RC Vishay Siliconix Document Number: 74105 Revision 01-Sep-05 www.vishay.com 3 |
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