Si4834BDY_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 14.1288 N/A 1.8963 RT2 13.5305 N/A 12.6114 RT3 30.7962 N/A 9.1299 RT4 51.5445 N/A 16.3624 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 3.1080 m N/A 325.4874 u CT2 414.6661 m N/A 4.7876 m CT3 26.9668 m N/A 32.6343 m CT4 1.3647 N/A 126.0560 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: 74624 Revision: 14-May-07 www.vishay.com 1 Si4834BDY_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 19.0374 N/A 3.0573 RF2 33.3211 N/A 19.0219 RF3 19.2621 N/A 14.6413 RF4 38.3794 N/A 3.2795 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot 494.8409 u CF1 3.3716 m N/A CF2 25.6313 m N/A 4.3714 m CF3 546.4488 m N/A 79.1151 m CF4 1.1315 N/A 379.6855 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: 74624 Revision: 14-May-07 Si4834BDY_RC Vishay Siliconix Document Number: 74624 Revision: 14-May-07 www.vishay.com 3