Si4542DY_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 23.9516 N/A 11.8569 RT2 8.1863 N/A 1.5467 RT3 25.4375 N/A 13.3672 RT4 52.8918 N/A 8.1168 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 19.6993 m N/A 5.8935 m 868.9811 u CT2 5.4156 m N/A CT3 108.4863 m N/A 50.6851 m CT4 1.6636 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: 73713 Revision 12-Jan-06 www.vishay.com 1 Si4542DY_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 7.0357 N/A 2.8948 RF2 19.1980 N/A 15.1042 RF3 30.6795 N/A 9.0359 RF4 52.9396 N/A 7.8293 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 2.9314 m N/A 1.3771 m CF2 6.4223 m N/A 4.4732 m CF3 34.8270 m N/A 42.9820 m CF4 1.4299 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: 73713 Revision 12-Jan-06 Si4542DY_RC Vishay Siliconix Document Number: 73713 Revision 12-Jan-06 www.vishay.com 3