Si8900EDB_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 21.1902 N/A 3.8442 RT2 15.0819 N/A 273.1000 m RT3 30.3726 N/A 6.1675 RT4 53.3553 N/A 4.7152 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 16.4995 m N/A 14.2753 m 183.2963 u CT2 8.0002 m N/A CT3 88.9361 m N/A 8.6158 m CT4 1.3664 N/A 12.1280 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: 69280 Revision: 08-Aug-07 www.vishay.com 1 Si8900EDB_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 15.7372 N/A 997.0218 m RF2 29.1523 N/A 7.3776 RF3 25.5399 N/A 5.6411 RF4 49.5706 N/A 984.2782 m Junction to Ambient Case Foot CF1 3.8053 m N/A 1.6172 m CF2 7.2013 m N/A 2.0515 m CF3 112.8131 m N/A 733.0584 u CF4 1.2889 N/A 6.8487 u 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: 69280 Revision: 08-Aug-07 Si8900EDB_RC Vishay Siliconix Document Number: 69280 Revision: 08-Aug-07 www.vishay.com 3