Si4420BDY_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 20.2318 N/A 11.8651 RT2 5.7017 N/A 1.6244 RT3 14.7588 N/A 11.5500 RT4 49.2096 N/A 3.0124 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 101.7504 m N/A 7.4085 m CT2 4.7284 m N/A 1.6130 m CT3 22.9678 m N/A 67.9593 m CT4 1.6013 N/A 1.6010 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: 70352 Revision 15-Mar-07 www.vishay.com 1 Si4420BDY_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 7.1064 N/A 1.9469 RF2 14.7132 N/A 12.8865 RF3 20.7359 N/A 7.1938 RF4 47.2578 N/A 5.8516 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot 689.7305 u CF1 3.5241 m N/A CF2 10.7696 m N/A 5.7338 m CF3 62.8186 m N/A 39.4624 m CF4 1.5653 N/A 265.0571 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: 70352 Revision 15-Mar-07 Si4420BDY_RC Vishay Siliconix Document Number: 70352 Revision 15-Mar-07 www.vishay.com 3