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SAWX4A0X 데이터시트(PDF) 4 Page - Seoul Semiconductor |
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4 / 22 page APCPCWM_4828539:WP_0000001WP_0000001 서식번호 : SSC-QP-7-07-25 (Rev.00) 4 Rev. 00 Rev. 00 September September 2011 2011 www.acriche.com www.acriche.com 1.3 PCB solder pad layout The ACRICHE A4 emitter should be mounted on a printed circuit board for electrical connections and to give a proper thermal path between the LED package and the heat sink. A temperature check point is recommended to be designed into the solder pad layout which can be used to calculate the junction temperature for thermal degradation and life time calculations. The solder pad should not be designed larger than the recommended size as the part may shift and excess solder paste may form solder balls which can create electrical shorts between internal pads on the package (Figure 4). 1.4 Junction Temperature The life time of the ACRICHE A4 emitter is most directly related to the junction temperature, but it is impossible to measure the junction temperature directly without any damage. Tj can be theoretically calculated by using the thermal resistance between the LED junction and the board. The equation for Tj is: Tj[℃] = Tb[℃] + RΘ j-b[℃/W] x emitter power[W]. The equation of the emitter power is calculated using the following formula: P[W] = Input Vrms[V] X Input Irms[A] X Power Factor – Irms2[A] X Resistor Value[Ω]. The rectifier power dissipation is negligible so we are not using this in the calculations, although we do need the Power Factor(PF) for the A4 emitter. It is about 0.89 in the typical drive configuration consisting of only a rectifier and a resistor. (Note: The PF is 1.00 generally in constant current drive). Figure 3. Recommended PCB solder pad layout 6.4 6.4 0.5 2.6 4.4 Temperature check point Figure 4. Incorrect soldering of the ACRICHE A4 emitter Internal electrical shorts can occur from Solder balls if excess solder paste is used. The LED may be partially on or totally turned off. Chip Metal PCB Solder paste Silicone lens Ceramic substrate T j (Junction Temperature) T b (Board Temperature) Figure 5. Thermal modeling of the ACRICHE A4 emitter |
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