Si4686DY_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 13.2599 N/A 12.1099 RT2 4.7039 N/A 1.8151 RT3 21.6204 N/A 4.3990 RT4 40.4158 N/A 5.6760 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 43.6643 m N/A 142.6877 m 481.3369 u CT2 4.8035 m N/A CT3 411.6817 m N/A 9.4824 m CT4 3.3774 N/A 37.2536 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: 74610 Revision: 09-May-07 www.vishay.com 1 Si4686DY_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 5.9882 N/A 2.4465 RF2 16.7624 N/A 7.3578 RF3 25.8275 N/A 8.3729 RF4 31.4219 N/A 5.8228 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot 483.9257 u CF1 4.8233 m N/A CF2 37.3844 m N/A 8.0507 m CF3 496.3225 m N/A 48.4346 m CF4 4.1250 N/A 266.9178 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: 74610 Revision: 09-May-07 Si4686DY_RC Vishay Siliconix Document Number: 74610 Revision: 09-May-07 www.vishay.com 3