The MAX5995 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board featuring an
Ethernet port, network powered-device (PD) interface
controller circuit for -57V supply rail systems. The EV kit
uses the MAX5995B IEEE® 802.3af/at/bt-compliant
network PD interface controller in a 16-pin TQFN package
with an exposed pad. The IC is used in Power-over-
Ethernet (PoE) applications requiring DC power from
an Ethernet network port for PDs such as VoIP phones,
wireless access nodes, security cameras, lighting, and
building automation.
The EV kit receives power from IEEE 802.3af/at/btcompliant
power-sourcing equipment (PSE). Refer to
the MAX5952, MAX5965A/MAX5965B, and MAX5980
IC data sheets for PSE controllers. The PSE provides
the required -36V to -57V DC power over an unshielded
twisted-pair Ethernet network cable to the EV kit’s RJ45
magnetic jack. The EV kit features a 1 x 1 Gigabit RJ45
magnetic jack and two active full-wave rectifiers (N101
and N102) for separating the DC power provided by an
endspan or midspan Ethernet system.
The EV kit can also be powered by a wall adapter power
source. The EV kit provides PCB pads to accept the
output of a wall adapter power source. When a wall
adapter power source is detected, it always takes
precedence over the PSE source and allows the wall
adapter to power the EV kit.
The EV kit demonstrates the full functionality of the
IC, such as PD detection signature, PD classification
signature, Multi-Event Classification (MEC), Intelligent
MPS, inrush current control, input undervoltage lockout
(UVLO), and DC-DC step-down converter. The step-down
converter operates at a fixed 290kHz switching frequency
and is configured for an isolated active-clamped forward
topology with output voltage +12V DC that can deliver
5.5A of current.
Applications
- Building Automation
- IEEE 802.3bt Powered Devices
- Lighting
- Small Cell, Pico Cell
- VOIP Phones, IP Security Cameras
- Wireless Access Point
