SiB455EDK_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. R-C values for the electrical circuit in the Foster/tank and Cauer/filter configurations are included. When implemented in P-SPICE, these values have matching characteristic curves to the single-pulse transient thermal impedance curves for the MOSFET. These RC values can be used in the P-SPICE simulation to evaluate the thermal behavior of the MOSFET junction temperature under a defined power profile. These techniques are described in application note AN609, “Thermal Simulation of Power MOSFETs on the P-SPICE Platform”. R-C THERMAL MODEL FOR TANK CONFIGURATION T (Junction) RT1 RT2 RT3 RT4 CT1 CT2 CT3 CT4 T (Ambient) R-C VALUES FOR TANK CONFIGURATION THERMAL RESISTANCE (°C/W) Junction to Ambient Case Foot RT1 11.6896 322.3634 m N/A RT2 29.0173 151.4366 m N/A RT3 14.5773 4.6136 N/A RT4 49.7158 4.4126 N/A THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case Foot CT1 190.9854 u 1.1733 u N/A CT2 3.6354 m 10.6419 m N/A CT3 280.9408 m 81.8806 u N/A CT4 1.7157 300.8006 u N/A Note N/A indicates not applicable This document is intended as a SPICE modeling guideline and does not constitute a commercial product datasheet. Designers should refer to the appropriate datasheet of the same number for guaranteed specification limits. Document Number: 65664 Revision: 11-Nov-09 www.vishay.com 1 SiB455EDK_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION T (Junction) RF2 RF1 CF1 CF2 RF3 RF4 T (Ambient) CF4 CF3 GND R-C VALUES FOR FILTER CONFIGURATION THERMAL RESISTANCE (°C/W) Junction to Ambient Case Foot RF1 13.5612 4.5235 N/A RF2 27.4850 3.8638 N/A RF3 19.1865 99.5030 m N/A RF4 44.7673 1.0032 N/A Junction to Ambient Case Foot CF1 194.3628 u 40.9905 u N/A CF2 3.6248 m 141.3380 u N/A CF3 219.9348 m 778.5330 u N/A CF4 1.6960 318.3538 u N/A THERMAL CAPACITANCE (Joules/°C) Note N/A indicates not applicable www.vishay.com 2 Document Number: 65664 Revision: 11-Nov-09 SiB455EDK_RC Vishay Siliconix Document Number: 65664 Revision: 11-Nov-09 www.vishay.com 3