SiF902EDZ_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) Foot Junction to Ambient Case RT1 4.0820 343.1000 m N/A RT2 12.6407 1.3305 N/A RT3 10.0717 2.1666 N/A RT4 49.2056 2.1598 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 428.6982 u 51.6965 m N/A CT2 127.3002 m 441.2460 u N/A CT3 9.9367 m 7.6265 m N/A CT4 1.6547 7.8038 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: 69298 Revision: 13-Aug-07 www.vishay.com 1 SiF902EDZ_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 4.8887 1.6136 N/A RF2 11.8166 2.3565 N/A RF3 12.6042 1.7781 N/A RF4 46.6905 251.8000 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 395.9376 u 380.4735 u N/A CF2 10.5146 m 3.2480 m N/A CF3 141.4110 m 431.6524 u N/A CF4 1.5981 354.6075 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: 69298 Revision: 13-Aug-07 SiF902EDZ_RC Vishay Siliconix Document Number: 69298 Revision: 13-Aug-07 www.vishay.com 3