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MAX5969B Evaluation Kit

Evaluates: MAX5969A/MAX5969B

General Description

The MAX5969B evaluation kit (EV kit) is a fully assem-

bled and tested surface-mount circuit board featur-

ing an Ethernet port, network powered-device (PD)

interface-controller circuit for IEEE

802.3af/at-compliant

power-over-Ethernet (PoE) systems. The EV kit features

the MAX5969B IEEE 802.3af/at-compliant network PD

interface controller IC in a 10-pin TDFN package. The

MAX5969B is used in PoE applications requiring DC

power from an Ethernet network port for PDs such as IP

phones, wireless access nodes, and security cameras.

The EV kit receives power from IEEE 802.3af/at-compliant

power-sourcing equipment (PSE). Refer to the MAX5965

and MAX5971 IC data sheets for PSE controllers. The

PSE provides the required -30V 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 1GbE RJ45 magnetic jack and two diode bridges 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, allowing 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, in-rush current control, and input under-

voltage lockout (UVLO). The EV kit also provides a

modular RJ45 jack to interface with the Ethernet data

signals only.

The EV kit also features a galvanically isolated 22.7W,

600kHz switching frequency flyback DC-DC converter,

which uses the MAX15000A current-mode PWM con-

troller. The IC’s output provides power for the converter

circuit. The DC-DC converter is configured for an output

voltage of +12V and provides up to 1.9A. High efficiency

up to 89% is achieved using a single transistor flyback

DC-DC converter topology. The surface-mount trans-

former provides up to +1500V galvanic isolation for the

output. UVLO, soft-start, and thermal shutdown provide

a robust 22.7W isolated power supply. The DC-DC

converter operates at 600kHz, allowing the use of small

magnetics and output capacitors. The EV kit can also

evaluate the MAX5969A after IC replacement (U1).

Features

S IEEE 802.3af/at-Compliant PD Interface Circuit

S -30V to -57V Input Range

S Demonstrates an Isolated +12V/22.7W Flyback

DC-DC Converter

S PD Detection and Configurable Classification

Signatures

S 2-Event Classification or Wall Adapter Detect

Output

S Power-Good Indicator Output

S In-Rush Current Limit of 180mA (max)

S Evaluates Endspan and Midspan Ethernet

Systems

S Evaluates the MAX5969B/MAX5969A in a 10-Pin

TDFN Package

S Simplified Wall Adapter Interface

S Fully Assembled and Tested

Ordering Information

IEEE is a registered service mark of the Institute of Electrical

and Electronics Engineers, Inc.

+Denotes lead(Pb)-free and RoHS compliant.

19-5179; Rev 0; 3/10

Component List

PART TYPE

MAX5969BEVKIT+ EV Kit

DESIGNATION QTY DESCRIPTION

C1 1

0.1FF Q10%, 100V X7R ceramic

capacitor (0805)

Murata GRM21BR72A104K

C2 1

0.1FF Q10%, 100V X7R ceramic

capacitor (0603)

Murata GRM188R72A104K

C3 1

1000pF Q10%, 50V X7R ceramic

capacitor (0402)

Murata GRM155R71H102K

C4 1

1000pF Q10%, 250V AC X7R

ceramic capacitor (1206)

AVX Corp. 1206GC102KAT1A

Summary of content (9 pages)

PAGE 1
9-5179; Rev 0; 3/10 MAX5969B Evaluation Kit The MAX5969B 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 IEEE® 802.3af/at-compliant power-over-Ethernet (PoE) systems. The EV kit features the MAX5969B IEEE 802.3af/at-compliant network PD interface controller IC in a 10-pin TDFN package.
PAGE 2
Evaluates: MAX5969A/MAX5969B MAX5969B Evaluation Kit Component List (continued) DESIGNATION QTY DESCRIPTION 2 1FF Q10%, 100V X7R ceramic capacitors (1210) Murata GRM32CR72A105K 1 4.7FF Q20%, 35V aluminum electrolytic capacitor (4mm x 5.8mm) Panasonic EEEFK1V4R7R 1 68FF Q20%, 63V aluminum electrolytic capacitor (8mm x 10.2mm) SANYO 63CE68FS 3 0.
PAGE 3
MAX5969B Evaluation Kit DESIGNATION QTY R6 1 1.37MI Q1% resistor (0402) DESCRIPTION R9, R10 2 10I Q5% resistors (0805) R11, R19 2 1kI Q1% resistors (0402) R12, R13 2 0.39I Q1%, 0.25W sense resistors (0805) Panasonic ERJ-6BQFR39V R14 1 8.25kI Q1% resistor (0402) R15 1 845I Q1% resistor (0402) R16 1 4.99kI Q1% resistor (0402) R17, R18, R22 3 10kI Q1% resistors (0402) R20 1 0I Q5% resistor (0402) R21 1 3.32kI Q1% resistor (0402) R23 1 9.53kI Q1% resistor (0402) R24 1 23.
PAGE 4
Evaluates: MAX5969A/MAX5969B MAX5969B Evaluation Kit Quick Start Required Equipment • IEEE 802.3af/at-compliant PSE and Category 5e Ethernet network cable • -48V, 1A-capable DC power supply • MAX5969B EV kit • Voltmeter Hardware Connections The MAX5969B 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.
PAGE 5
MAX5969B Evaluation Kit CLASS MAXIMUM POWER USED BY PD (W) RESISTOR R2 (I) 0 0.44 to 12.95 619 1 0.44 to 3.84 118 2 3.84 to 6.49 66.5 3 6.49 to 12.95 43.2 4 12.95 to 25.5 30.9 5 > 25.5 21.5 Under severe fault or failure conditions, this EV kit can dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this EV kit with care to avoid possible personal injury.
PAGE 6
Evaluates: MAX5969A/MAX5969B MAX5969B Evaluation Kit Figure 1a.
PAGE 7
MAX5969B Evaluation Kit Evaluates: MAX5969A/MAX5969B Figure 1b.
PAGE 8
Evaluates: MAX5969A/MAX5969B MAX5969B Evaluation Kit 1.0” Figure 2. MAX5969B EV Kit Component Placement Guide— Component Side 1.0” Figure 3. MAX5969B EV Kit PCB Layout—Component Side 1.0” Figure 4.
PAGE 9
MAX5969B Evaluation Kit Figure 5. MAX5969B EV Kit PCB Layout—VCC Layer 3 Evaluates: MAX5969A/MAX5969B 1.0” 1.0” Figure 6. MAX5969B EV Kit PCB Layout—Solder Side 1.0” Figure 7. MAX5969B EV Kit Component Placement Guide— Solder Side Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.