Si7848BDP_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) Foot Junction to Ambient Case RT1 1.7021 4.4900 m N/A RT2 12.9417 763.6100 m N/A RT3 9.6767 1.5502 N/A RT4 45.6795 1.1817 N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.6680 m 5.8976 m N/A CT2 410.1105 m 817.8572 u N/A CT3 34.0136 m 13.5077 m N/A CT4 1.6033 11.1571 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: 73997 Revision: 21-Jun-07 www.vishay.com 1 Si7848BDP_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 3.1831 12.9831 m N/A RF2 12.8594 880.7106 m N/A RF3 21.2722 1.6900 N/A RF4 32.6853 916.3063 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 3.2541 m 85.5122 u N/A CF2 42.8876 m 513.3697 u N/A CF3 483.6856 m 5.6650 m N/A CF4 1.7209 367.8514 u 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: 73997 Revision: 21-Jun-07 Si7848BDP_RC Vishay Siliconix Document Number: 73997 Revision: 21-Jun-07 www.vishay.com 3