SiR870DP_RC

SiR870DP_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
RT1
13.2078
113.0557m
Foot
N/A
RT2
6.0649
373.8497m
N/A
RT3
2.7995
542.5297m
N/A
RT4
31.9278
168.8730m
N/A
THERMAL CAPACITANCE (Joules/°C)
Junction to
Ambient
Case
Foot
CT1
1.0638
932.3844u
N/A
CT2
125.2382m
185.9394m
N/A
CT3
26.0917m
17.2344m
N/A
CT4
3.3100
664.3159m
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: 67639
Revision: 17-Feb-11
www.vishay.com
1
SiR870DP_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
5.9102
148.7450m
N/A
RF2
9.2682
433.2167m
N/A
RF3
26.8208
202.0592m
N/A
RF4
11.7265
409.8945m
N/A
THERMAL CAPACITANCE (Joules/°C)
Junction to
Ambient
Case
CF1
23.6931m
1.1231m
Foot
N/A
CF2
233.8261m
13.5351m
N/A
CF3
1.1772
18.7512m
N/A
CF4
9.6436
122.9028m
N/A
Note
N/A indicates not applicable
www.vishay.com
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Document Number: 67639
Revision: 17-Feb-11
SiR870DP_RC
Vishay Siliconix
Document Number: 67639
Revision: 17-Feb-11
www.vishay.com
3