SQJ910AEP_RC www.vishay.com 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 RT1 13.1174 342.1165m Foot N/A RT2 4.8051 1.2661 N/A RT3 10.4040 512.7769m N/A RT4 56.3139 972.7092m N/A THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case Foot CT1 231.9471m 53.6330m N/A CT2 4.0411m 8.2445m N/A CT3 25.5895m 1.4931m N/A CT4 1.3188 13.6284m N/A 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. Revision: 21-Jun-13 1 Document Number: 67114 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SQJ910AEP_RC www.vishay.com Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION T (Junction) RF2 RF1 CF1 RF3 CF2 RF4 T (Ambient) CF4 CF3 GND R-C VALUES FOR FILTER CONFIGURATION THERMAL RESISTANCE (°C/W) Junction to Ambient Case Foot RF1 4.6947 706.9061m N/A RF2 14.9779 1.6173 N/A RF3 17.0487 754.8991m N/A RF4 48.0392 14.0138m N/A THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case Foot CF1 2.4283m 953.4192u N/A CF2 19.2484m 3.4377m N/A CF3 311.0537m 4.9362m N/A CF4 1.2225 5.5220u N/A Note • n/a indicates not applicable Revision: 21-Jun-13 2 Document Number: 67114 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SQJ910AEP_RC www.vishay.com Revision: 21-Jun-13 Vishay Siliconix 3 Document Number: 67114 THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000