SiA911DJ_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 27.8444 13.5384 u N/A RT2 13.2763 5.8442 N/A RT3 24.6832 5.9340 N/A RT4 42.5995 4.1781 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 2.1767 m 33.2234 n N/A CT2 98.0538 u 455.1145 u N/A CT3 36.5093 m 54.7731 u N/A CT4 1.0064 483.2881 u 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: 70411 Revision 22-Mar-07 www.vishay.com 1 SiA911DJ_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 13.8391 8.7738 N/A RF2 30.8093 3.8432 N/A RF3 23.0844 1.7166 N/A RF4 40.6974 1.6357 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 87.5026 u 45.4628 u N/A CF2 1.9177 m 196.9508 u N/A CF3 38.5977 m 383.0453 u N/A CF4 1.0048 98.0426 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: 70411 Revision 22-Mar-07 SiA911DJ_RC Vishay Siliconix Document Number: 70411 Revision 22-Mar-07 www.vishay.com 3