Si7636DP_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 6.7954 82.2060 m N/A RT2 3.1439 320.5989 m N/A RT3 12.5036 701.0328 m N/A RT4 42.1013 694.6344 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 105.4856 m 52.2996 u N/A CT2 12.8320 m 9.5140 m N/A CT3 438.9719 m 63.7348 m N/A CT4 1.9645 65.9384 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: 70392 Revision 21-Mar-07 www.vishay.com 1 Si7636DP_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Foot Junction to Ambient Case RF1 2.0088 380.3937 m N/A RF2 10.1064 404.1361 m N/A RF3 17.6738 607.7460 m N/A RF4 34.9414 408.2572 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 5.0738 m 3.5541 m N/A CF2 45.8111 m 13.4185 m N/A CF3 349.7810 m 24.1383 m N/A CF4 2.0369 31.7294 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: 70392 Revision 21-Mar-07 Si7636DP_RC Vishay Siliconix Document Number: 70392 Revision 21-Mar-07 www.vishay.com 3