Si4888DY_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 19.5023 N/A 5.7401 RT2 23.8152 N/A 683.1000 m RT3 9.4114 N/A 6.1598 RT4 27.2711 N/A 5.4170 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 79.0920 m N/A 13.4159 m CT2 1.8166 N/A 3.4540 m CT3 10.9944 m N/A 325.9870 m CT4 3.8068 N/A 68.9450 m 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: 74627 Revision: 01-Jun-07 www.vishay.com 1 Si4888DY_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 5.9804 N/A 1.2845 RF2 17.7285 N/A 6.9027 RF3 15.1728 N/A 4.5092 RF4 41.1183 N/A 5.3036 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 4.9914 m N/A 2.8583 m CF2 28.6913 m N/A 7.8992 m CF3 305.1750 m N/A 41.2871 m CF4 1.4986 N/A 269.4138 m 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: 74627 Revision: 01-Jun-07 Si4888DY_RC Vishay Siliconix Document Number: 74627 Revision: 01-Jun-07 www.vishay.com 3