Si3871DV_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 14.4116 N/A 20.0667 RT2 3.9935 N/A 9.0198 RT3 73.0149 N/A 25.2127 RT4 43.3803 N/A 30.4457 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 958.8341 µ N/A 25.5236 m CT2 879.9088 µ N/A 180.6311 µ CT3 5.7811 m N/A 29.2192 m CT4 1.1174 N/A 2.0831 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: 74080 Revision 29-Aug-05 www.vishay.com 1 Si3871DV_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 21.9808 N/A 11.4468 RF2 24.1274 N/A 39.5939 RF3 45.6870 N/A 19.0533 RF4 42.4685 N/A 14.9027 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 435.2103 µ N/A 201.7735 µ CF2 4.2091 m N/A 1.8083 m CF3 3.1329 m N/A 15.3303 m CF4 1.1916 N/A 15.5438 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: 74080 Revision 29-Aug-05 Si3871DV_RC Vishay Siliconix Document Number: 74080 Revision 29-Aug-05 www.vishay.com 3