Si5441BDC_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 3.7639 N/A 3.6633 RT2 23.9524 N/A 2.9878 RT3 18.5630 N/A 9.5361 RT4 48.7208 N/A 3.8127 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 259.5429 u N/A 250.5520 u CT2 31.6163 m N/A 84.0574 m CT3 3.7592 m N/A 1.5995 m CT4 1.4852 N/A 4.9962 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: 73972 Revision: 12-Jun-07 www.vishay.com 1 Si5441BDC_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 4.6007 N/A 6.8530 RF2 22.5107 N/A 11.4563 RF3 20.6711 N/A 1.2460 RF4 47.2176 N/A 444.6382 m Junction to Ambient Case Foot CF1 231.3325 u N/A 254.9952 u CF2 3.3774 m N/A 1.6097 m CF3 34.3085 m N/A 301.6984 m CF4 1.5346 N/A 22.7700 m Thermal Capacitance (Joules/°C) 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: 73972 Revision: 12-Jun-07 Si5441BDC_RC Vishay Siliconix Document Number: 73972 Revision: 12-Jun-07 www.vishay.com 3