SUM27N20-78 AN609 - Datasheet Archive

Vishay Siliconix R-C Thermal Model Parameters DESCRIPTION The parametric values in the R-C thermal model have been derived using

SUM27N20-78 SUM27N20-78_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 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 N/A 82.1009 m N/A RT2 N/A 500.5937 m N/A RT3 N/A 288.4124 m N/A RT4 N/A 128.8929 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 N/A 73.9104 m N/A CT2 N/A 9.6627 m N/A CT3 N/A 1.7529 m N/A CT4 N/A 139.9932 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: 69641 Revision: 26-Sep-07 www.vishay.com 1 SUM27N20-78 SUM27N20-78_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 N/A 500.2929 m N/A RF2 N/A 457.8845 m N/A RF3 N/A 34.6080 m N/A RF4 N/A 7.2146 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 N/A 1.5966 m N/A CF2 N/A 12.9270 m N/A CF3 N/A 17.5106 m N/A CF4 N/A 79.7344 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: 69641 Revision: 26-Sep-07 SUM27N20-78 SUM27N20-78_RC Vishay Siliconix Document Number: 69641 Revision: 26-Sep-07 www.vishay.com 3