Si4626DY_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 11.1028 N/A 5.8243 RT2 7.0448 N/A 611.8000 m RT3 24.2658 N/A 1.9392 RT4 42.5866 N/A 12.6247 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 2.6452 N/A 13.2732 m CT2 10.6223 m N/A 634.6655 u CT3 57.0129 m N/A 49.4648 m CT4 2.2388 N/A 101.1514 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: 74817 Revision: 19-Jul-07 www.vishay.com 1 Si4626DY_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 10.4779 N/A 1.1885 RF2 23.3845 N/A 7.9287 RF3 37.6875 N/A 5.5757 RF4 13.4501 N/A 6.3071 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 9.4890 m N/A 1.2188 m CF2 52.3863 m N/A 9.5578 m CF3 1.2421 N/A 48.1423 m CF4 4.4361 N/A 166.4443 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: 74817 Revision: 19-Jul-07 Si4626DY_RC Vishay Siliconix Document Number: 74817 Revision: 19-Jul-07 www.vishay.com 3