Si4390DY_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 4.9368 N/A 356.4928 m RT2 30.1113 N/A 4.9592 RT3 28.7510 N/A 8.9660 RT4 26.3833 N/A 5.6680 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 8.1415 m N/A 4.3781 m CT2 46.8532 m N/A 74.2899 m CT3 2.2308 N/A 245.4435 m CT4 3.4489 N/A 8.1421 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: 74086 Revision 29-Aug-05 www.vishay.com 1 Si4390DY_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 5.3456 N/A 5.4128 RF2 28.8277 N/A 5.0268 RF3 28.7235 N/A 5.5889 RF4 27.3734 N/A 3.9583 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 4.9331 m N/A 5.4510 m CF2 34.7263 m N/A 20.7772 m CF3 929.3819 m N/A 102.6252 m CF4 1.3859 N/A 349.0890 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: 74086 Revision 29-Aug-05 Si4390DY_RC Vishay Siliconix Document Number: 74086 Revision 29-Aug-05 www.vishay.com 3