Si5499DC_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 10.4243 N/A 9.2733 RT2 12.0158 N/A 2.8176 RT3 2.1446 N/A 890.2929 m RT4 25.0707 N/A 7.0904 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 7.5455 m N/A 1.1282 m 254.0526 u CT2 69.3500 m N/A CT3 522.4490 u N/A 2.8838 CT4 2.5535 N/A 4.5365 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: 73985 Revision: 20-Jun-07 www.vishay.com 1 Si5499DC_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 2.3046 N/A 4.1709 RF2 12.6154 N/A 12.1067 RF3 10.5498 N/A 2.7273 RF4 24.2231 N/A 996.1180 m Junction to Ambient Case Foot CF1 409.6697 u N/A 172.6501 u CF2 6.2604 m N/A 842.7430 u CF3 76.6856 m N/A 6.8355 m CF4 2.5913 N/A 1.3016 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: 73985 Revision: 20-Jun-07 Si5499DC_RC Vishay Siliconix Document Number: 73985 Revision: 20-Jun-07 www.vishay.com 3