Si4800BDY_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 10.6072 N/A 594.6719 m RT2 6.5451 N/A 11.8243 RT3 32.0009 N/A 13.2377 RT4 45.6419 N/A 4.2852 Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CT1 815.0453 u N/A 3.0178 m CT2 243.5891 m N/A 7.7403 m CT3 31.8434 m N/A 125.8362 m CT4 1.2519 N/A 497.4729 u 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: 73743 Revision 16-Jan-06 www.vishay.com 1 Si4800BDY_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 8.8589 N/A 4.5817 RF2 6.6722 N/A 4.6315 RF3 35.3515 N/A 7.9983 RF4 43.9584 N/A 12.7469 Junction to Ambient Case Foot CF1 1.0774 m N/A 406.6431 u CF2 4.2314 m N/A 4.5343 m CF3 27.5138 m N/A 1.3059 m CF4 1.2870 N/A 117.0465 m Thermal Capacitance (Joules/°C) 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: 73743 Revision 16-Jan-06 Si4800BDY_RC Vishay Siliconix Document Number: 73743 Revision 16-Jan-06 www.vishay.com 3