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Product Data Sheet

5

SMJD-XD12W4PX - Acrich3 13W

Rev1.3, Apr 1, 2016

Thermal Resistance

The Acrich3 module is recommended to keep the junction temperature under maximum junction

temperature spec. (Table 5)

LED lead temperature and IC top case temperature are measured with thermocupler. (Fig1)

LED & IC juntion temperatures can be calculated using the formulas below.

T

< Example >

If LED lead temperature and IC top temerature are 110℃

1) LED juntion temperature

T

= 110℃ + (9 ℃/W * 0.84W) = 117.56 ℃

2)

IC junction temperature

T

(1)

= 110℃ + (11.25 ℃/W * 2.8W) = 141.5℃

* (1) : In the example, P

Part

Maximum

Junction Temperature [℃]

R

θ

Acrich3 LED

125

9

Acrich3 IC

150

11.25

Notes :

Table 5. Thermal information, Ta = 25ºC