Linear Technology DC1788B Demo Manual page 5

Dc1788B-B quick start proceDure
NOTE: Handle the DC1788B-B by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 2 to evaluate the DC1788B-B with a
DC/DC converter. If a resistive load is used to evaluate the
DC1788B-B, connect the load by hand between VOUT+
and VOUT– after the LED (D3) is lit. It is recommended
to disconnect the resistive load before powering down
the DC1788B-B, so at the next turn on the load is discon-
nected. If the load is not connected and disconnected
by hand properly, the PD may not power on. Contact
field applications engineers for further details.
2. Connect the output of the PSE to the RJ45 connector
(J1) on the DC1788B-B board with a CAT5e or CAT6
Ethernet cable.
Figure 2. Setup Diagram for the DC1788B-B with a DC/DC Converter, a Microprocessor, and a Type 2 PSE
DEMO MANUAL DC1788B
3. After connection has been established, verify that the
LED (D3) is lit. This indicates the PSE has successfully
detected and powered the PD.
Auxiliary Supply Input
1. Refer to Figure 3 to evaluate the DC1788B-B with a
DC/DC converter and an auxiliary DC power supply.
2. Connect the auxiliary supply to the AUX+ to AUX– in-
puts. Check to make sure the voltage polarity is correct
before turning on the auxiliary power supply.
3. Turn on the auxiliary power supply and verify that the
LED (D3) is lit.
dc1788bfa
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