Si4482DY_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 17.0178 N/A 6.6243 RT2 28.0613 N/A 4.6782 RT3 9.4155 N/A 7.5231 RT4 25.5054 N/A 2.1744 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 118.8809 m N/A 353.7164 m CT2 2.3931 N/A 18.6846 m CT3 25.9049 m N/A 91.4534 m CT4 3.5206 N/A 21.3292 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: 74678 Revision 08-May-07 www.vishay.com 1 Si4482DY_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 12.1238 N/A 1.5044 RF2 17.9102 N/A 7.4671 RF3 40.2587 N/A 10.1929 RF4 9.7073 N/A 1.8356 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 19.5936 m N/A 7.1379 m CF2 93.5428 m N/A 3.2192 m CF3 1.4446 N/A 89.7423 m CF4 877.7160 m N/A 609.3153 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: 74678 Revision 08-May-07 Si4482DY_RC Vishay Siliconix Document Number: 74678 Revision 08-May-07 www.vishay.com 3