Si8465DB_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-Full Copper(FC) Ambient-Minimum Copper(MC) Foot RT1 41.7716 52.8539 N/A RT2 9.6630 38.0723 N/A RT3 23.9352 58.5941 N/A RT4 24.4879 40.8002 N/A THERMAL CAPACITANCE (Joules/°C) Junction to Ambient-Full Copper(FC) Ambient-Minimum Copper(MC) CT1 267.8702 u 829.7687 u Foot N/A CT2 565.9177 m 57.9980 m N/A CT3 4.6510 m 4.8205 m N/A CT4 1.6538 583.1416 m 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: 65452 Revision: 09-Sep-09 www.vishay.com 1 Si8465DB_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-Full Copper(FC) Ambient-Minimum Copper(MC) Foot RF1 45.5917 75.5098 N/A RF2 21.8254 54.0982 N/A RF3 28.1334 29.6710 N/A RF4 4.5611 29.9583 N/A Junction to Ambient-Full Copper(FC) Ambient-Minimum Copper(MC) Foot CF1 249.0576 u 721.3691 u N/A CF2 5.0482 m 6.4083 m N/A CF3 714.6096 m 102.6309 m N/A CF4 20.0003 657.3939 m N/A THERMAL CAPACITANCE (Joules/°C) Note N/A indicates not applicable www.vishay.com 2 Document Number: 65452 Revision: 09-Sep-09 Si8465DB_RC Vishay Siliconix Document Number: 65452 Revision: 09-Sep-09 www.vishay.com 3