Datasheet
EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
MDC_EMH-54/3-Q48N-C.A05 Page 14 of 15
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Power Over Ethernet (PoE)
Power over Ethernet (PoE) supports the implementation of the IEEE 802.3af and
IEEE 802.3at standards; this implementation allows both data and electrical
power to pass over a copper Ethernet LAN cable. PoE permits electric power,
along with data, to be passed over a copper Ethernet LAN cable. Powered
devices, such as voice-over-IP telephones, wireless access points, video cam-
eras, and point-of-sale devices, that support PoE can receive power safely from
the access ports that are used to connect personal computers to the network.
IEEE 802.3at increases the amount of power to 30W. The PoE standard provides
support for legacy PoE devices. An IEEE 802.af powered device can operate
normally when connected to IEEE 802.at power sourcing equipment.
Figure 3. Driving the Negative Logic On/Off Control Pin
ON/OFF
CONTROL
–VIN
+VIN +VCC
Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when installing these
converters. These specifi cations vary depending on the solder type. Exceeding these
specifi cations may cause damage to the product. Be cautious when there is high atmo-
spheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your
production environment may differ; therefore please thoroughly review these guidelines
with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders: For Sn/Pb based solders:
Maximum Preheat Temperature 115° C. Maximum Preheat Temperature 105° C.
Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C.
Maximum Solder Dwell Time 7 seconds Maximum Solder Dwell Time 6 seconds
Standard Class
Maximum Power
delivered by PoE port
Power range of
powered device
IEEE 802.3af (PoE)
and IEEE 802.3at (PoE +)
0 15.4 W 0.44 through 12.95 W
1 4 W 0.44 through 3.84 W
2 7.0 W 3.84 through 6.49 W
3 15.4 W 6.49 through 12.95 W
IEEE 802.3at (PoE+) 4 30.0 W 12.95 through 25.5 W
Table 1. Class of Powered Device and Power Levels