Si4936BDY_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 27.0649 N/A 19.0930 RT2 25.9226 N/A 15.9337 RT3 7.7216 N/A 3.4662 RT4 49.2909 N/A 6.5071 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 7.6418 m N/A 48.4816 m CT2 104.4942 m N/A 6.7573 m CT3 362.7486 u N/A 137.0604 u CT4 1.8965 N/A 1.9636 m 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: 69646 Revision: 26-Sep-07 www.vishay.com 1 Si4936BDY_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 9.5029 N/A 5.0442 RF2 30.0367 N/A 13.6446 RF3 25.2253 N/A 17.4983 RF4 45.2351 N/A 8.8129 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 415.3397 u N/A 156.3599 u CF2 7.4217 m N/A 1.9461 m CF3 113.7864 m N/A 10.5641 m CF4 1.9996 N/A 137.5572 m 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: 69646 Revision: 26-Sep-07 Si4936BDY_RC Vishay Siliconix Document Number: 69646 Revision: 26-Sep-07 www.vishay.com 3