Si4892DY_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 configuration are included. The corresponding values for the Cauer/Filter configuration are available upon request. 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 416.5888 m RT1 6.9866 N/A RT2 23.4320 N/A 4.9312 RT3 48.8761 N/A 10.5103 RT4 79.6363 N/A 3.9978 Junction to Ambient Case Foot CT1 6.3284 m N/A 47.0640 µ CT2 57.3384 m N/A 34.4153 m Thermal Capacitance (Joules/°C) CT3 1.4488 N/A 131.2354 m CT4 2.7348 k N/A 6.0760 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:74116 Revision 14-Nov-05 www.vishay.com 1 Si4892DY_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 6.0630 N/A 3.7072 RF2 23.1852 N/A 6.8208 RF3 26.1088 N/A 4.9271 RF4 24.6871 N/A 4.3644 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 3.8215 m N/A 2.8266 m CF2 37.1815 m N/A 12.6372 m CF3 898.9124 m N/A 122.8029 m CF4 2.1287 N/A 2.0775 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:74116 Revision 14-Nov-05 Si4892DY_RC Vishay Siliconix Document Number:74116 Revision 14-Nov-05 www.vishay.com 3