©
Semiconductor Components Industries, LLC, 2019
June, 2019
−
Rev. 0
1
Publication Order Number:
EVBUM2644/D
NCP1095GEVB
NCP1095 Evaluation Board
User's Manual
IEEE 802.3bt PoE-PD Interface Controller
Board
General
The NCP1095GEVB board allows easy implementation
and evaluation of a Power-over-Ethernet powered
equipment that is able to operate with an assigned power
level up to 90 W. The evaluation board is based on the PoE
PD Controller NCP1095 (U2) that uses an external
pass-switch (Q1) and sense resistor (R10). The board can
also facilitate the design of proprietary 100 W+
applications.
Figure 1. Operational NCP1095GEVB Showing
Basic Interconnections
The NCP1095GEVB board is designed as a PoE splitter:
having a PoE-enabled Ethernet port (labeled “PoE IN”) as
input and offering the power to a separate connector (J2)
while passing through the data to another Ethernet port
(labeled “E OUT”).
Quick Start Guide
Step 1: Connect the power connections available on
connector J2 (labeled “GND” and “VPP”) to the DC/DC
converter on the system that needs to be powered (cf. black
and red wires in the picture on the left). The DC/DC
converter behind the NCP1095 EVB should be operational
over a 34 V to 57 V voltage range.
Step 2: Connect the
control connection
to the DC/DC
converter!
It is important that the DC/DC converter or
any significant load is kept off when the pass-switch is
charging the input capacitance.
For a DC-DC converter with an undervoltage (UV or
UVLO) or an active high enable (EN or SHDN), the “
PG
”
signal on connector J2 could be used (cf. green wire in the
picture on the left). The “PG” signal will be clamped to 18 V
by a zener when the board is powered up. For some DC-DC
converter boards an additional diode in series with the
control connection might be required (cathode connected to
NCP1095 and anode connected to the DC-DC converter).
For a DC-DC converter with an active low enable (EN or
SHDN or ON/OFF), the “nPG” signal on P1 could be used.
The “
nPG
” signal will be pulled up to VPP during the inrush
phase. Always check the voltage rating of the enable,
shutdown or undervoltage pin of the DC-DC converter.
Step 3: Insert the Ethernet cable (cf. blue cable in the picture
on the left) coming from the PSE in the Ethernet connector
J3 labeled “PoE IN”.
If the PSE powers up the system the green PGOOD LED
should be ON.
The status of the remaining LEDs depends on the PSE
being used.
EVAL BOARD USER’S MANUAL
