WP23 datasheet(6/10 Pages) LUMILEDS

6 / 10 page

(a)

(b)

1.00E-02

1.00E-01

1.00E+00

1.00E+01

1.00E+02

1.00E+03

1.00E+04

0.51

1.52

2.5

Rth (K/W)

Rth J-C for 3 parts

Part 1 (Kapton Tape)

Part 1 (Thermal Grease)

Part 2 (Kapton Tape)

Part 2 (Thermal Grease)

Part 3 (Kapton Tape)

Part 3 (Thermal Grease)

1.00E-02

1.00E-01

1.00E+00

1.00E+01

1.00E+02

1.00E+03

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Rth (K/W)

Rth J-C for 3 parts, zoomed in

Part 1 (Kapton Tape)

Part 1 (Thermal Grease)

Part 2 (Kapton Tape)

Part 2 (Thermal Grease)

Part 3 (Kapton Tape)

Part 3 (Thermal Grease)

Figure 6. Example of a differential structure function graphs used to determine divergence point and R

th J-C.

1.00E-03

1.00E-02

1.00E-01

1.00E+00

1.00E+01

1.00E+02

1.00E+03

1.00E+04

1.00E+05

0.2

0.4

0.6

0.8

1.2

1.4

Rth (K/W)

Rth J-C for a group of parts

Thermal Grease

Kapton Tape

Rth is 0.49 ± 0.05 K/W

Figure 7. Determining typical divergence from multiple devices.

1.00E-02

1.00E-01

1.00E+00

1.00E+01

1.00E+02

1.00E+03

1.00E+04

1.00E+05

01234

Rth (K/W)

Multiple TIMs

Kapton Tape

Thermal Tape

Thermal Grease

1.00E-02

1.00E-01

1.00E+00

1.00E+01

1.00E+02

1.00E+03

1.00E+04

1.00E+05

0.1

0.2

0.3

0.4

0.5

Rth (K/W)

Multiple TIMs (zoomed in)

Kapton Tape

Thermal Tape

Thermal Grease

th J-stage via Thermal Grease is 0.46 K/W

th J-stage via Thermal Tape is 1.14 K/W

th J-stage via Kapton Tape is 4.1 K/W

Figure 8. Sample differential structure function plot of a single device

with three different thermal interface materials between case and heat sink.

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