Si8901DB_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 21.1096 N/A 6.9699 RT2 24.7636 N/A 588.3000 m RT3 21.8313 N/A 6.9357 RT4 52.2955 N/A 7.5061 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 2.9289 m N/A 6.4938 m CT2 95.6244 m N/A 102.3927 u CT3 13.0143 m N/A 6.5239 m CT4 1.6425 N/A 6.0146 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: 69521 Revision: 22-Aug-07 www.vishay.com 1 Si8901DB_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 23.0547 N/A 734.8000 m RF2 26.0648 N/A 8.4047 RF3 21.0053 N/A 11.6733 RF4 49.8752 N/A 1.1872 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.9841 m N/A 253.8635 u CF2 7.0126 m N/A 1.8025 m CF3 102.0949 m N/A 93.7133 u CF4 1.5831 N/A 20.9316 u 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: 69521 Revision: 22-Aug-07 Si8901DB_RC Vishay Siliconix Document Number: 69521 Revision: 22-Aug-07 www.vishay.com 3