SiB414DK_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 Ambient Case Foot RT1 27.0713 1.9818 N/A RT2 13.9534 1.4707 N/A RT3 14.8827 3.1117 N/A RT4 49.0926 2.9358 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 5.0661 m 118.4340 u N/A CT2 260.9856 u 154.0489 u N/A CT3 391.3129 m 581.9782 u N/A CT4 2.2125 246.5084 u 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: 68334 Revision: 19-Dec-07 www.vishay.com 1 SiB414DK_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 14.3660 2.5823 N/A RF2 27.3222 4.5152 N/A RF3 18.7728 1.0943 N/A RF4 44.5390 1.3082 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 222.1962 u 35.2139 u N/A CF2 4.4046 m 53.5437 u N/A CF3 315.7482 m 365.0170 u N/A CF4 2.0547 457.7854 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: 68334 Revision: 19-Dec-07 SiB414DK_RC Vishay Siliconix Document Number: 68334 Revision: 19-Dec-07 www.vishay.com 3