SQ2328ES_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. R-C values for the electrical circuit in the Foster/tank and Cauer/filter configurations are included. When implemented in P-SPICE, these values have matching characteristic curves to the single-pulse transient thermal impedance curves for the MOSFET. These RC values can be used in the P-SPICE simulation to evaluate the thermal behavior of the MOSFET junction temperature under a defined power profile. These techniques are described in application note AN609, “Thermal Simulation of Power MOSFETs on the P-SPICE Platform”. R-C THERMAL MODEL FOR TANK CONFIGURATION T (Junction) RT1 RT2 RT3 RT4 CT1 CT2 CT3 CT4 T (Ambient) R-C VALUES FOR TANK CONFIGURATION THERMAL RESISTANCE (°C/W) Junction to Ambient Case Foot RT1 60.5872 N/A 9.0636 RT2 16.9108 N/A 2.7529 RT3 61.1826 N/A 7.5911 RT4 25.8084 N/A 30.5801 Junction to Ambient Case Foot CT1 1.4432 N/A 4.1430m CT2 268.8524m N/A 279.3369u CT3 6.2265m N/A 235.0673m CT4 1.1245m N/A 12.4003m THERMAL CAPACITANCE (Joules/°C) Note N/A indicates not applicable This document is intended as a SPICE modeling guideline and does not constitute a commercial product datasheet. Designers should refer to the appropriate datasheet of the same number for guaranteed specification limits. Document Number: 67712 Revision: 02-Mar-11 www.vishay.com 1 SQ2328ES_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION T (Junction) RF2 RF1 CF1 CF2 RF3 RF4 T (Ambient) CF4 CF3 GND R-C VALUES FOR FILTER CONFIGURATION THERMAL RESISTANCE (°C/W) Junction to Ambient Case Foot RF1 13.2458 N/A 4.5767 RF2 47.7806 N/A 19.6106 RF3 39.0015 N/A 23.0119 RF4 63.8436 N/A 3.2552 THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case Foot CF1 462.9800u N/A 418.7427u CF2 2.0270m N/A 3.7693m CF3 15.7873m N/A 15.4893m CF4 1.1631 N/A 1.0588 Note N/A indicates not applicable www.vishay.com 2 Document Number: 67712 Revision: 02-Mar-11 SQ2328ES_RC Vishay Siliconix Document Number: 67712 Revision: 02-Mar-11 www.vishay.com 3