Si4398DY_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 19.9646 N/A 186.7000 m RT2 6.1436 N/A 2.8279 RT3 25.4726 N/A 9.7214 RT4 28.4192 N/A 3.2640 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 83.2736 m N/A 537.4334 u CT2 20.4655 m N/A 56.0989 m CT3 3.9815 N/A 187.3686 m CT4 2.2390 N/A 20.3531 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: 69645 Revision: 26-Sep-07 www.vishay.com 1 Si4398DY_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 7.7734 N/A 1.1592 RF2 17.2091 N/A 5.7213 RF3 10.6643 N/A 5.5635 RF4 44.3532 N/A 3.5560 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 15.0893 m N/A 8.4977 m CF2 51.4696 m N/A 7.2734 m CF3 573.3665 m N/A 133.3399 m CF4 1.1613 N/A 346.7364 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: 69645 Revision: 26-Sep-07 Si4398DY_RC Vishay Siliconix Document Number: 69645 Revision: 26-Sep-07 www.vishay.com 3