Si4486EY_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 13.4389 N/A 6.3593 RT2 5.1108 N/A 944.9503 m RT3 16.7765 N/A 3.3405 RT4 48.9638 N/A 10.3749 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 61.3750 m N/A 15.0791 m CT2 11.7026 m N/A 6.7469 m CT3 171.8818 m N/A 877.7676 m CT4 1.6999 N/A 87.9996 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: 70357 Revision 19-Mar-07 www.vishay.com 1 Si4486EY_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 7.2845 N/A 1.8210 RF2 19.2687 N/A 8.9210 RF3 14.1189 N/A 8.2987 RF4 43.8469 N/A 1.9465 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 9.0889 m N/A 3.5399 m CF2 32.1476 m N/A 12.0117 m CF3 260.5862 m N/A 100.2378 m CF4 1.5615 N/A 471.6705 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: 70357 Revision 19-Mar-07 Si4486EY_RC Vishay Siliconix Document Number: 70357 Revision 19-Mar-07 www.vishay.com 3