Si4922BDY_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 3.4618 N/A 10.8734 RT2 11.1535 N/A 2.6037 RT3 42.9409 N/A 7.5331 RT4 52.4438 N/A 18.9898 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 1.5141 m N/A 11.5317 m CT2 10.1484 m N/A 1.0016 m CT3 25.8725 m N/A 8.8518 m CT4 1.3501 N/A 44.6029 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: 73962 Revision: 12-Jun-07 www.vishay.com 1 Si4922BDY_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 12.7092 N/A 3.4606 RF2 29.4888 N/A 17.9065 RF3 18.5746 N/A 13.8033 RF4 49.2274 N/A 4.8296 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot 675.8404 u CF1 2.8419 m N/A CF2 13.0469 m N/A 3.5607 m CF3 60.0334 m N/A 25.6769 m CF4 1.2807 N/A 105.2815 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: 73962 Revision: 12-Jun-07 Si4922BDY_RC Vishay Siliconix Document Number: 73962 Revision: 12-Jun-07 www.vishay.com 3