Si4952DY_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 6.7278 N/A 11.6583 RT2 29.6140 N/A 3.6731 RT3 25.9110 N/A 8.9996 RT4 47.7472 N/A 19.6690 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 347.8859 u N/A 2.2210 m CT2 56.4091 m N/A 170.7109 u CT3 6.7511 m N/A 180.0765 m CT4 1.0972 N/A 11.0677 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: 74688 Revision: 09-May-07 www.vishay.com 1 Si4952DY_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 10.1112 N/A 6.2766 RF2 32.1645 N/A 20.6392 RF3 25.8678 N/A 14.5542 RF4 41.8565 N/A 2.5300 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 598.8307 u N/A 223.8922 u CF2 7.0365 m N/A 2.6660 m CF3 77.6027 m N/A 29.6184 m CF4 1.2885 N/A 919.3445 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: 74688 Revision: 09-May-07 Si4952DY_RC Vishay Siliconix Document Number: 74688 Revision: 09-May-07 www.vishay.com 3