Si7909DN-RC

Si7909DN_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. These
techniques are described in "A Simple Method of
Generating Thermal Models for a Power MOSFET"[1].
When implemented in P-Spice, these values have
matching characteristic curves to the Single Pulse
Transient Thermal Impedance curves for the
MOSFET.
R-C values for the electrical circuit in the Foster/Tank
and Cauer/Filter configurations are included.
Note:
For a detailed explanation of implementing these values in
P-SPICE, refer to Application Note AN609 Thermal Simulations Of
Power MOSFETs on P-SPICE Platform.
R-C THERMAL MODEL FOR TANK CONFIGURATION
R-C VALUES FOR TANK CONFIGURATION
Thermal Resistance (°C/W)
Junction to
Ambient
Case
Foot
RT1
10.0659
1.7654
N/A
RT2
56.5917
917.0038 m
N/A
RT3
16.2226
513.4962 m
N/A
RT4
11.1198
1.8041
N/A
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CT1
567.6399 u
2.2536 m
N/A
N/A
CT2
1.5867
381.7385 u
CT3
11.1549 m
378.3022 m
N/A
CT4
265.4022 m
1.5575 m
N/A
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: 69270
Revision: 08-Aug-07
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Si7909DN_RC
Vishay Siliconix
R-C THERMAL MODEL FOR FILTER CONFIGURATION
R-C VALUES FOR FILTER CONFIGURATION
Thermal Resistance (°C/W)
Junction to
Ambient
Case
Foot
RF1
12.7969
1.8167
N/A
RF2
16.8918
2.6797
N/A
RF3
13.9897
415.3083 m
N/A
RF4
50.3216
88.2917 m
N/A
Thermal Capacitance (Joules/°C)
Junction to
Ambient
Case
Foot
CF1
624.3994 u
269.9786 u
N/A
CF2
15.4313 m
969.6215 u
N/A
CF3
335.4291 m
388.3320 m
N/A
CF4
1.4071
11.3066 m
N/A
Note: NA indicates not applicable
Reference:
[1] "A Simple Method of Generating Thermal Models for a Power MOSFET" by Wharton McDaniel and Kandarp Pandya, IEEE / SEMITHERM 2002
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Document Number: 69270
Revision: 08-Aug-07
Si7909DN_RC
Vishay Siliconix
Document Number: 69270
Revision: 08-Aug-07
www.vishay.com
3