Si9926BDY_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 5.5620 N/A 4.9132 RT2 29.8649 N/A 9.8704 RT3 20.0813 N/A 12.0178 RT4 54.4919 N/A 13.1985 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.2913 m N/A 340.2249 u CT2 63.3771 m N/A 5.7329 m CT3 11.2330 m N/A 45.4003 m CT4 1.7476 N/A 4.6444 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: 69290 Revision: 10-Aug-07 www.vishay.com 1 Si9926BDY_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 6.2528 N/A 5.4940 RF2 25.9178 N/A 21.7455 RF3 24.5193 N/A 8.1005 RF4 53.3100 N/A 4.6599 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 785.8928 u N/A 240.7782 u CF2 8.4891 m N/A 1.9507 m CF3 58.9603 m N/A 23.1890 m CF4 1.6140 N/A 44.2266 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: 69290 Revision: 10-Aug-07 Si9926BDY_RC Vishay Siliconix Document Number: 69290 Revision: 10-Aug-07 www.vishay.com 3