SiE844DF_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 R-C VALUES FOR TANK CONFIGURATION Thermal Resistance (°C/W) Junction to Ambient Case Drain Top RT1 3.1362 602.0700 m Case Source 1.9579 RT2 12.0459 1.0938 1.7234 RT3 17.6497 2.5327 2.6525 RT4 35.1682 771.4300 m 666.2000 m Junction to Ambient Case Drain Top Case Source CT1 1.9835 m 379.1138 m 49.2110 m CT2 51.6893 m 24.6176 m 9.9046 m CT3 1.0084 18.1494 m 195.3756 m CT4 2.9679 1.0428 m 458.3565 u Thermal Capacitance (Joules/°C) 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: 68682 Revision: 22-Apr-08 www.vishay.com 1 SiE844DF_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Junction to Ambient Case Drain Top Case Source RF1 34.101 696.6948 m 900.7000 m RF2 12.9975 1.8804 2.3465 RF3 24.3507 2.0724 2.1335 RF4 27.2417 350.5052 m 1.6193 Junction to Ambient Case Drain Top Case Source CF1 1.8381 m 688.2587 u 592.9540 u CF2 46.3111 m 7.2464 m 8.7929 m CF3 643.9230 m 6.9696 m 34.9365 m CF4 2.6406 690.8983 m 309.5145 m Thermal Capacitance (Joules/°C) Note NA indicates not applicable www.vishay.com 2 Document Number: 68682 Revision: 22-Apr-08 SiE844DF_RC Vishay Siliconix Document Number: 68682 Revision: 22-Apr-08 www.vishay.com 3 SiE844DF_RC Vishay Siliconix www.vishay.com 4 Document Number: 68682 Revision: 22-Apr-08