SQJ960EP_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 4.0789 1.3599 N/A RT2 11.1384 442.3000m N/A RT3 9.5502 1.4015 N/A RT4 60.2325 1.0963 N/A THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case CT1 2.5690m 22.3461m Foot N/A CT2 186.8226m 12.7057 N/A CT3 26.9808m 2.3469m N/A CT4 1.0355 931.4997u 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. Document Number: 67867 Revision: 31-Mar-11 www.vishay.com 1 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 SQJ960EP_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 6.9714 2.3878 N/A RF2 14.5042 927.5933m N/A RF3 14.4851 544.2426m N/A RF4 49.0393 439.2920m N/A THERMAL CAPACITANCE (Joules/°C) Junction to Ambient Case Foot CF1 3.3581m 699.3403u N/A CF2 36.7364m 14.9824m N/A CF3 406.6985m 207.9008u N/A CF4 786.7570m 13.2025 N/A Note N/A indicates not applicable www.vishay.com 2 Document Number: 67867 Revision: 31-Mar-11 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 SQJ960EP_RC Vishay Siliconix Document Number: 67867 Revision: 31-Mar-11 www.vishay.com 3 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