Si7326DN_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 6.3690 1.7313 N/A RT2 33.6842 1.5591 N/A RT3 15.3620 1.2626 N/A RT4 25.5848 1.4470 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 6.4281 m 5.1735 m N/A CT2 3.9763 5.7461 m N/A CT3 47.4607 m 384.0234 u N/A CT4 1.3816 22.7784 m N/A 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: 69739 Revision: 02-Oct-07 www.vishay.com 1 Si7326DN_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Foot Junction to Ambient Case RF1 6.9017 907.8400 m N/A RF2 15.4608 1.4099 N/A RF3 29.2926 2.8276 N/A RF4 29.3449 854.6600 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 4.9012 m 260.6296 u N/A CF2 34.9790 m 591.0574 u N/A CF3 829.1860 m 2.2795 m N/A CF4 2.4232 25.4750 m N/A 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: 69739 Revision: 02-Oct-07 Si7326DN_RC Vishay Siliconix Document Number: 69739 Revision: 02-Oct-07 www.vishay.com 3