PEM1212 INFOMART IT SOLUTIONS, PEM1212 Datasheet - Page 4

• Manufacturer Part Number: PEM1212
• Description: 55T6940
• Manufacturer: INFOMART IT SOLUTIONS

Specifications of PEM1212

• Rohs Compliant: YES

Figure 6 – PHYSICAL PACKAGE
All dimensions in mm
THERMAL PROFILE
www.poweredethernet.com
F.6. Heat Generation
As with any power component, the PEM1200 modules generate heat. It is important that adequate ventilation and airflow be taken into consideration at the design stage. The
quantum of heat generated by the PEM1200 will depend on the output load it is required to drive. The maximum ambient operating temperature is 70
the thermal performance of the PEM1200 with a nominal 48VDC input. The PEM1200 thermal performance can be improved by forced airflow cooling over the module and by
using a heat sink (a) glued on to the output diodes using a thermal glue, or (b) by a power plane heat sink described in Figure 8 below. The two methods can be combined.
Figure 7 – Thermal Performance profile at nominal V
Figure 8 – Power Plane Heat Sink
by
RECOMMENDED PC BOARD LAYOUT
PEM12XX
Place C1 close to output pins
6.90
Ø1.1
0.60
16.80 ± 0.5
14
12
10
8
6
4
2
0
-20
9.90
2.54
-10
3.00 ± 0.25
Power Plane Heat Sink
-VDC
0
PEM1203
1
OUTPUT
10
0.60 ± 0.05
+VDC
PEM1200_11G_R0-8 (DRAFT)
Ambient Temperature (
C1
in
20
33.5 ± 0.25
PEM1205
30
A power plane heat sink on the motherboard is a relatively simple method
to draw some heat away from the PEM1200 using the output pins (-VDC
and +VDC) which are connected to a PCB heat sink on the motherboard. It
is important to maintain electrical isolation between OADJ pin and the
+VDC and -VDC pins to ensure proper output voltages.
These power plane heat sinks must be on the outer layers of the PCB and
the PEM1200 must not be fitted into a socket.
This method can be combined with forced airflow cooling, and with a heat
sink glued on to the two output diodes using a thermal glue.
2.54 ± 0.25
40
PEM12XX
O
56 ± 0.5
C)
30.48 ± 0.5
3.50
50
PEM1212
Power Over Ethernet PD Module
60
PEM1200 SERIES
70
O
C. Figure 7 below, shows
80
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