LZ9 MCPCB Family
Emitter + MCPCB
Thermal Resistance
(oC/W)
Diameter
Typical Vf Typical If
Part number Type of MCPCB
(mm)
19.9
19.9
(V)
(mA)
1-channel
LZ9-Jxxxxx
1.3 + 0.2 = 1.5
1.3 + 0.2 = 1.5
29.1
9.7
700
(1x9 string)
1-channel
(3x3 strings)
LZ9-Kxxxxx
2100
.
Mechanical Mounting of MCPCB
o
o
o
Mechanical stress on the emitter that could be caused by bending the MCPCB should be avoided. The
stress can cause the substrate to crack and as a result might lead to cracks in the dies.
Therefore special attention needs to be paid to the flatness of the heat sink surface and the torque
on the screws. Maximum torque should not exceed 1 Nm (8.9 lbf/in).
Care must be taken when securing the board to the heatsink to eliminate bending of the MCPCB. This
can be done by tightening the three M3 screws (or #4-40) in steps and not all at once. This is
analogous to tightening a wheel of an automobile
o
o
It is recommended to always use plastic washers in combination with three screws. Two screws could
more easily lead to bending of the board.
If non taped holes are used with self-tapping screws it is advised to back out the screws slightly after
tighten (with controlled torque) and retighten the screws again.
.
Thermal interface material
o
To properly transfer the heat from the LED to the heatsink a thermally conductive material is required
when mounting the MCPCB to the heatsink
o
There are several materials which can be used as thermal interface material, such as thermal paste,
thermal pads, phase change materials and thermal epoxies. Each has pro’s and con’s depending on
the application. For our emitter it is critical to verify that the thermal resistance is sufficient for the
selected emitter and its environment.
o
To properly transfer the heat from the MCPCB to the heatsink also special attention should be paid to
the flatness of the heatsink.
.
Wire soldering
For easy soldering of wires to the MCPCB it is advised to preheat the MCPCB on a hot plate to a
o
maximum of 150°. Subsequently apply the solder and additional heat from the solder iron to initiate a
good solder reflow. It is recommended to use a solder iron of more than 60W. We advise to use lead
free, no-clean solder. For example SN-96.5 AG-3.0 CU 0.5 #58/275 from Kester (pn: 24-7068-7601)
LZ9-00NW00 (1.2-02/07/13)
16
LED Engin | 651 River Oaks Parkway | San Jose, CA 95134 USA | ph +1 408 922 7200 | fax +1 408 922 0158 | em sales@ledengin.com | www.ledengin.com
