Si5461EDC_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 9.8655 N/A 1.6562 RT2 18.7482 N/A 4.6859 RT3 14.8777 N/A 7.7472 RT4 51.5087 N/A 5.9108 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 838.5909 u N/A 768.8431 u CT2 69.4324 m N/A 5.6388 m CT3 8.2041 m N/A 2.0367 m CT4 1.3912 N/A 38.5481 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: 73978 Revision: 20-Jun-07 www.vishay.com 1 Si5461EDC_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 14.7646 N/A 7.5300 RF2 22.4488 N/A 9.3619 RF3 16.9248 N/A 1.1457 RF4 40.8617 N/A 1.9626 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 877.4717 u N/A 655.6617 u CF2 13.8718 m N/A 2.9518 m CF3 404.5836 m N/A 92.6433 m CF4 1.3981 N/A 56.2748 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: 73978 Revision: 20-Jun-07 Si5461EDC_RC Vishay Siliconix Document Number: 73978 Revision: 20-Jun-07 www.vishay.com 3