N 2010-03
r 2009
Application Note AN 2010-08
V2.0, August 2010
3
Mounting a Driver Board onto the Module
The driver board could be mounted in two ways: through connectors (strongly
recommended) or alternative directly soldering on the top of the module.
When a driver board or module adapter board (PCB) is soldered directly on top of the
module, the contact joints (=solder connections) between PCB and module auxiliary contacts
should be mechanically relieved as much as possible. Relieve of the contact points is carried
out by mounting the PCB directly onto the module at the eight mounting stand-offs (Figure 2)
using self-tapping (thread forming) screws or similar assembly material. The length of the
used self-tapping screws is depended on the PCB thickness. Example: For mounting a PCB
with 1.6mm thickness a self-trapping screw with 3 mm diameter and 10mm length should be
used for example type Delta PT 30x10 from EJOT.
Position of the mounting
„self-tapping“ screws
Position of the guidance
holes
1
2
3
4
5
6
7
8
Figure 2
PCB mounting stand-off of HybridPACK™ 2 module.
The screws should be mounted in the sequence showed in Figure 2. The initial 1.5mm of the
mounting stand-off serve as guidance only and cannot take any force. The thread in the
plastics will form itself by driving in the screws. Apart from manually driving the screws into
the mounting stand-offs an electronically controlled or at least slowly turning electric
screwdriver (
≤
300rpm) is a preferred aid (due to the lack of accuracy we do not recommend
the use of pneumatic screwdrivers). The maximum applied force M
max
is 0.9Nm ±10%. The
effective length of the screw thread entering the mounting stand-off should be of a minimum
length of l
min
≥
6mm and a maximum length of l
max
≤
9mm giving consideration to the PCB
thickness and the weight of the driver PCB.
