Si4812BDY_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 MOS Ambient SCH Foot RT1 28.4528 11.1617 N/A RT2 22.4857 31.4775 N/A RT3 6.5630 23.8736 N/A RT4 32.4985 33.4872 N/A Thermal Capacitance (Joules/°C) Junction to Ambient MOS Ambient SCH Foot CT1 40.0298 m 433.0512 u N/A CT2 1.6857 96.9447 m N/A CT3 4.0731 m 6.9941 m N/A CT4 3.3716 1.8926 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: 74695 Revision: 09-May-07 www.vishay.com 1 Si4812BDY_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Foot Junction to Ambient MOS Ambient SCH RF1 5.6118 13.4984 N/A RF2 17.7793 26.2516 N/A RF3 17.2242 32.2508 N/A RF4 49.3847 27.9992 N/A Thermal Capacitance (Joules/°C) Junction to Ambient MOS Ambient SCH Foot CF1 2.4126 m 475.3633 u N/A CF2 23.2033 m 6.8757 m N/A CF3 67.9932 m 107.5056 m N/A CF4 1.4999 2.3063 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: 74695 Revision: 09-May-07 Si4812BDY_RC Vishay Siliconix Document Number: 74695 Revision: 09-May-07 www.vishay.com 3