Si9933BDY_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 23.7917 N/A 782.1677 m RT2 7.6165 N/A 4.1108 RT3 32.4088 N/A 19.4573 RT4 45.9134 N/A 15.5279 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 9.6457 m N/A 2.6819 m CT2 600.5571 u N/A 486.7394 u CT3 62.4646 m N/A 62.0502 m CT4 1.3812 N/A 6.0012 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: 73693 Revision 23-Dec-05 www.vishay.com 1 Si9933BDY_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 7.3857 N/A 4.3934 RF2 28.4889 N/A 16.5333 RF3 30.8462 N/A 9.3558 RF4 42.9641 N/A 9.9210 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 444.5771 u N/A 199.5736 u CF2 6.7474 m N/A 4.4137 m CF3 52.9790 m N/A 30.3868 m CF4 1.4180 N/A 94.2723 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: 73693 Revision 23-Dec-05 Si9933BDY_RC Vishay Siliconix Document Number: 73693 Revision 23-Dec-05 www.vishay.com 3