Si4660DY_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 23.8233 N/A 699.1000 m RT2 7.3482 N/A 3.6036 RT3 25.6885 N/A 12.0744 RT4 28.1400 N/A 5.6229 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 52.4141 m N/A 698.7679 u CT2 6.0208 m N/A 6.7953 m CT3 4.3517 N/A 114.3837 m CT4 1.6141 N/A 23.7765 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: 69611 Revision: 10-Sep-07 www.vishay.com 1 Si4660DY_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 4.7196 N/A 1.1253 RF2 18.0747 N/A 7.0316 RF3 14.6489 N/A 6.1369 RF4 47.5568 N/A 7.7062 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot 795.9928 u CF1 2.5399 m N/A CF2 23.4737 m N/A 5.2004 m CF3 151.1154 m N/A 36.9043 m CF4 1.3725 N/A 136.0152 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: 69611 Revision: 10-Sep-07 Si4660DY_RC Vishay Siliconix Document Number: 69611 Revision: 10-Sep-07 www.vishay.com 3