SMJF-2D16W4PD Datasheet, PDF (5/24 Pages) Seoul Semiconductor – Connects directly to AC line voltage

Thermal Resistance
Table 5. Thermal information, Ta = 25ºC
Part
Maximum
Junction Temperature [℃]
Acrich3 LED
125
Acrich3 IC
150
Notes :
Product Data Sheet
SMJF-2D16W4PX - Acrich3 16.6W
Rθ_j-s [℃/W]
9
11.25
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.
< Example >
T_{s_max} = T_{j_max} - (Rθ_j-s * P_d)
If LED lead temperature and IC top temerature are 110℃
1) LED juntion temperature
T_J = T_S + (Rθ_j-s * P_d)
= 110℃ + (9 ℃/W * 0.84W) = 117.56 ℃
2) IC junction temperature
T_J = T_S + (Rθ_j-s * P_d) ⁽¹⁾
= 110℃ + (11.25 ℃/W * 2.8W) = 141.5℃
* (1) : In the example, P_d value is the power consumption of IC when the rated voltage.
Rev1.2, Apr 1, 2016
5
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