SUPPLIER

PHONE

WEBSITE

AVX Corporation

843-946-0238

www.avxcorp.com

Bel Fuse Inc.

201-432-0463

www.belfuse.com

Central Semiconductor Corp.

631-435-1110

www.centralsemi.com

Cooper Bussmann

916-941-1117

www.cooperet.com

Diodes Incorporated

805-446-4800

www.diodes.com

Fairchild Semiconductor

888-522-5372

www.fairchildsemi.com

International Rectifier

310-322-3331

www.irf.com

Murata Electronics North America, Inc.

770-436-1300

www.murata-northamerica.com

Panasonic Corp.

800-344-2112

www.panasonic.com

Pulse Engineering

858-674-8100

www.pulseeng.com

STMicroelectronics

408-452-8585

www.us.st.com

Sumida Corp.

847-545-6700

www.sumida.com

Taiyo Yuden

800-348-2496

www.t-yuden.com

TDK Corp.

847-803-6100

www.component.tdk.com

_________________________________________________________________ Maxim Integrated Products 4

MAX5969A Evaluation Kit

Evaluates: MAX5969A/MAX5974A

Component Suppliers

Note: Indicate that you are using the MAX5969A when contacting these component suppliers.

Quick Start

Required Equipment

• MAX5969AEVkit

• IEEE 802.3af/at-compliant PSE and Category 5e

Ethernet network cable

• -48V,1A-capableDCpowersupply

• Voltmeter

Hardware Connections

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) Use one of the following methods to power the EV kit:

• If network connectivity is required: Connect a

Category 5e Ethernet network cable from the EV

kit input port RJ45 connector to the correspond-

ing PSE Ethernet LAN connection, which provides

power to the EV kit. A modular Ethernet jack

(J1) provides an interface with the Ethernet data

signals only.

• If network connectivity is not required: Connect

a -48V DC power supply between the V+ and

V- PCB pads on the EV kit. Connect the power-

supply positive terminal to the V+ PCB pad and

the negative terminal to the V- PCB pad.

2) Activate the PSE power supply or turn on the external

DC power supply.

3) Using a voltmeter, verify that the EV kit provides +12V

across the VOUT and PGND PCB pads. PGND is

galvanically isolated from the EV kit’s input V+ and

WAD_IN PCB pads.

Detailed Description of Hardware

The MAX5969A EV kit features an Ethernet port network

PD interface-controller circuit for -57V supply rail systems.

The EV kit circuit contains a MAX5969A IEEE 802.3af/

at-compliant network PD interface controller and the

MAX5974A inductive-feedback, spread-spectrum, cur-

rent-mode PWM controller. The EV kit circuit is used in PoE

applications for powering PDs from an unshielded twisted-

pair (UTP) Category 5e Ethernet network cable and PSE

port using endspan or midspan Ethernet systems.

The EV kit demonstrates the full functionality of the

MAX5969A, such as PD detection, PD classification,

inrush current control, and UVLO. Resistors R1 and R4

set the PD detection signature and the PD classification

signatures, respectively.

The EV kit’s power circuit is a galvanically isolated 12W

power supply using the MAX5974A DC-DC current-

mode PWM controller in a synchronous-rectified flyback

DC-DC converter topology. The EV kit receives power

from an IEEE 802.3af/at-compliant PSE and a Category

5e Ethernet network cable connected to the EV kit’s

RJ45 MagJack. The EV kit uses a 1 x 1Gb Ethernet RJ45

MagJack and two full-bridge power rectifiers (D1, D2) to

separate the -57V DC power sent by the PSE. The EV kit

accepts power from an endspan or midspan PSE net-

work configuration. The EV kit also provides an Ethernet

jack (J1) for interfacing to the Ethernet data signals. PCB

pads V+ and V- are available for powering the EV kit

if network connectivity is not required. Common-mode

chokes L1 and L3 are provided for EMI filtering at the

EV kit power supply (V+, V-) and wall adapter (WAD_IN,

WAD_GND) inputs, respectively.