Si5484DU_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) Foot Junction to Ambient Case RT1 5.5431 28.8945 m N/A RT2 19.4536 1.1108 N/A RT3 15.0558 1.4224 N/A RT4 48.9104 1.4419 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 2.1071 m 686.5381 u N/A CT2 13.3151 m 190.7991 u N/A CT3 178.1933 m 1.3230 m N/A CT4 1.4793 1.2716 m N/A 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: 73728 Revision 13-Jan-06 www.vishay.com 1 Si5484DU_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Junction to Ambient Case Foot RF1 6.1642 1.7953 N/A RF2 22.2142 1.4822 N/A RF3 16.1658 571.1917 m N/A RF4 44.3978 150.0745 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.4684 m 145.1296 u N/A CF2 10.2828 m 578.5153 u N/A CF3 190.2917 m 867.6748 u N/A CF4 1.4192 38.2575 u N/A Note: NA indicates not applicable 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: 73728 Revision 13-Jan-06 Si5484DU_RC Vishay Siliconix Document Number: 73728 Revision 13-Jan-06 www.vishay.com 3