Si4933DY_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 10.2913 N/A 11.8569 RT2 24.3855 N/A 1.5467 RT3 21.6440 N/A 13.3672 RT4 54.1972 N/A 8.1168 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 6.1908 m N/A 5.8935 m CT2 94.9300 m N/A 868.9811 u CT3 23.9265 m N/A 50.6851 m CT4 1.5542 N/A 207.5273 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: 70376 Revision 19-Mar-07 www.vishay.com 1 Si4933DY_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 7.0272 N/A 2.8948 RF2 19.2083 N/A 15.1042 RF3 30.5929 N/A 9.0359 RF4 52.9680 N/A 7.8293 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 2.9330 m N/A 1.3771 m CF2 6.4425 m N/A 4.4732 m CF3 34.8211 m N/A 42.9820 m CF4 1.4294 N/A 65.0020 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: 70376 Revision 19-Mar-07 Si4933DY_RC Vishay Siliconix Document Number: 70376 Revision 19-Mar-07 www.vishay.com 3