MAX5971AEVKIT Maxim Integrated, MAX5971AEVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX5971AEVKIT
• Description: Power Management IC Development Tools
• Manufacturer: Maxim Integrated
• Series: MAX5971r

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Warning: The GND banana jack is more positive than
the VEE banana jack. Use an isolated oscilloscope for
probing with respect to VEE.
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation. Caution: Do not turn on
the power supply until all connections are completed.
1) Verify that a shunt is not installed on jumpers JU1
2) Verify that a shunt is installed on jumper JU5 (legacy
3) Connect the -32V to -60V DC power supply to the
4) Connect a PD to the Ethernet output port J2 RJ45
5) Connect the EV kit’s network input LAN RJ45 port
6) Turn on the power supply and set it to -54V.
7) Test points TP11, TP13 (VEE), and TP2 (GND) are
8) Pressing pushbutton switch SW1 shuts down the PSE
(ILIM1, Class 0–Class 4), JU2 (ILIM2, Class 0–Class
4), JU3 (PWM enabled), JU4 (midspan mode), and
JU6 (AC disconnect).
mode disabled).
metal VEE banana jack and the supply ground to the
metal GND banana jack. Do not turn on the power
supply until all connections are completed.
connector on the EV kit’s MagJack module J2
RJ45 connector. This step is optional if network
connectivity and/or a PD are not required.
(J1) to the corresponding PD LAN connection. This
step is optional if network connectivity is not required.
provided throughout the PCB to observe the desired
signals with an oscilloscope or voltage meter. Use an
isolated oscilloscope for probing with respect to
VEE or RTN.
output DC power and resets U1.
MAX5971A EV kit
-32V to -60V, 1A capable DC power supply
Voltmeter for confirming output voltage
_________________________________________________________________ Maxim Integrated Products 3
Hardware Connections
Required Equipment
Quick Start
MAX5971A Evaluation Kit
The MAX5971A EV kit features a 10/100/1000BASE-TX
Ethernet single-port PSE controller circuit for -54V sup-
ply rail systems. The EV kit’s PSE circuit uses the IEEE
802.3af/at-compliant MAX5971A PSE controller featuring
an integrated n-channel power MOSFET and an on-
board single 1 x 1Gb MagJack module (integrated in
J2) to form the basic portion of a PSE circuit. The EV
kit has been designed as an IEEE 802.3af/at-compliant
PSE and demonstrates all the required functions, such
as PD discovery, classification, current-limit control
of a connected PD at the Ethernet output port, and
AC-/DC-disconnect detection.
The EV kit’s PSE circuit requires a -32V to -60V power
supply (-54V supply rail) capable of supplying 1A to the EV
kit’s GND and VEE steel banana jacks or PCB pads.
The IC controls the -54V DC power to the output port
by regulating the port’s current. The current is fed
to the 10/100/1000BASE-TX magnetic output module
connected to the J2 Ethernet output port RJ45 jack.
An IEEE 802.3af/at-compliant PD connects to Ethernet
output port J2 on the EV kit. The PD can be located
within 350ft from the EV kit when connected with a
twisted 4-pair Ethernet cable. The 10/100/1000BASE-TX
magnetic module (J2) is decoupled to the EV kit’s
chassis ground internally. The EV kit’s isolated chassis
ground (CHASSIS_GND) PCB pad connects to the network
system ground.
The EV kit starts up in automatic operation mode
and demonstrates PD detection, PD classification, over-
current protection, current foldback, undervoltage/over-
voltage protection (+28.5V, +62.5V (typ), respectively
(GND - V
power Class 5 mode operation. The Class 5 overcurrent
and current-limit protection can be reconfigured through
jumpers. PD-blocking diode D4 can be bypassed
to reduce power dissipation when AC-disconnect
monitoring is not required. The port’s AC-detection
circuit resistor-capacitor network (R3, C4) can be
reconfigured as well. The output port also features a 600W
unidirectional overvoltage-transient suppressor diode
(D2) and decoupling capacitor (C5) for transient
protection at the output port.
Detailed Description of Hardware
Evaluates: MAX5971A
EE
)), AC-/DC-disconnect monitoring, and high-