MAX5974AEVKIT Maxim Integrated, MAX5974AEVKIT Datasheet

MAX5974AEVKIT

Manufacturer Part Number

MAX5974AEVKIT

Description

Power Management IC Development Tools

Manufacturer

Maxim Integrated

Type

PWM Controllersr

Series

MAX5974A, MAX5974B, MAX5974C, MAX5974Dr

Datasheet

1.MAX5974AEVKIT.pdf (11 pages)

Specifications of MAX5974AEVKIT

Product

Evaluation Kits

Tool Is For Evaluation Of

MAX5974A

Input Voltage

- 30 V to - 57 V

Output Voltage

5 V

Output Current

4.7 A

Current page: 1 of 11
Download datasheet (2Mb)

19-5880; Rev 0; 5/11

The MAX5974A evaluation kit (EV kit) is a fully assembled

and tested surface-mount circuit board featuring the

MAX5974A active-clamped, spread-spectrum, current-

mode PWM controller for Power-over-Ethernet (PoE)

powered device (PD) applications. The EV kit is a

compact and low-cost design used in Power-over-

LAN (PoLAN) applications requiring DC power from

an Ethernet network port for PDs such as IP phones,

wireless access nodes, and security cameras.

The EV kit features a galvanically isolated 25W, 600kHz

switching frequency forward DC-DC converter using

the IC. The circuit achieves high efficiency up to 92%

(VIN = +42V) using a coupled-inductor forward DC-DC

converter topology. The surface-mount transformer

provides up to +1650V galvanic isolation for the output.

The EV kit output voltage is configured for +5V and

provides up to 4.7A load current.

The EV kit includes the MAX5969B IEEE

at-compliant network PD interface-controller IC, which

provides PD detection signature, PD classification

signature, in-rush current control, and undervoltage

lockout (UVLO).

The EV kit circuit receives its power from IEEE 802.3af/

at-compliant power-sourcing equipment (PSE). The PSE

provides the required -30V to -57V DC power over an

unshielded twisted-pair Ethernet network cable to the

EV kit’s RJ45 MagJack

RJ45 MagJack and two full-bridge diodes for separating

the DC power provided by an endspan or midspan

Ethernet system.

The EV kit circuit can also be powered by a +37V to

+57V wall-adapter power source applied at the PWR+

and PWR- PCB pads. When a wall-adapter power source

is detected, it takes precedence over the PSE source,

allowing the wall adapter to power the EV kit.

Warning: The EV kit is designed to operate with high

voltages. Dangerous voltages are present on this EV kit

and on equipment connected to it. Users who power up

this EV kit or power the sources connected to it must be

careful to follow safety procedures appropriately to work

with high-voltage electrical equipment.

Under severe fault or failure conditions, this EV kit may

dissipate large amounts of power that could result in the

mechanical ejection of a component or of component

debris at high velocity. Operate this kit with care to avoid

possible personal injury.

IEEE is a registered service mark of the Institute of Electrical

and Electronics Engineers, Inc.

MagJack is a registered trademark of Bel Fuse Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

_______________________________________________________________ Maxim Integrated Products 1

General Description

. The EV kit features a 1 x 1Gb

802.3af/

MAX5974A Evaluation Kit

#Denotes RoHS compliant.

MAX5974AEVKIT#

IEEE 802.3af/at-Compliant PD Interface Circuit

-30V to -57V Input Range

Demonstrates an Isolated 23.5W Coupled-Inductor

Forward DC-DC Converter

92% Efficiency (MAX5974A DC-DC Circuitry)

Isolated +5V Output at 4.7A

PD Detection and Configurable Classification

Signatures

2-Event Classification or Wall-Adapter Detect

Output

In-Rush Current Limit of 180mA (max)

Internal UVLO at +16V

Evaluates Endspan and Midspan Ethernet

Systems

Simplified Wall-Adapter Interface

Proven PCB Layout

Fully Assembled and Tested

PART

Ordering Information

EV Kit

TYPE

Features

Related parts for MAX5974AEVKIT

MAX5974AEVKIT Summary of contents

Page 1

... Classification or Wall-Adapter Detect S Output In-Rush Current Limit of 180mA (max) S Internal UVLO at +16V S Evaluates Endspan and Midspan Ethernet S Systems ® 802.3af/ Simplified Wall-Adapter Interface S Proven PCB Layout S Fully Assembled and Tested S PART MAX5974AEVKIT# #Denotes RoHS compliant. Features Ordering Information TYPE EV Kit ...

Page 2

MAX5974A Evaluation Kit DESIGNATION QTY DESCRIPTION 10pF Q5%, 50V COG ceramic C1 1 capacitor (0603) Murata GRM1885C1H100H 0.1µF Q10%, 100V X7R ceramic C2 1 capacitor (1206) KEMET C1206C104K1RACTU 0.056µF Q10%, 16V X7R ceramic C3 1 capacitor (0402) Murata GRM155R61C104K 22µF ...

Page 3

DESIGNATION QTY DESCRIPTION R7, R26 2 499I Q1% resistors (0402) R9, R27 2 100kI Q1% resistors (0402) R10 1 2kI Q1% resistor (0402) R11 1 10kI Q1% resistor (0402) R12, R13 2 10I Q5% resistors (0805) R14 1 24.9kI Q1% ...

Page 4

MAX5974A Evaluation Kit Required Equipment • MAX5974A EV kit • IEEE 802.3af/at-compliant PSE and Category 5e Ethernet network cable • -48V, 1A-capable DC power supply • 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 ...

Page 5

PD Classification Signature The EV kit is configured for a Class 4 (12.95W to 25.5W) PD classification by resistor R4. To reconfigure the PD classification, replace surface-mount 0805 resistor R4. Table 1 lists the PD classification options. Wall-Adapter Power Source ...

Page 6

MAX5974A Evaluation Kit EFFICIENCY vs. OUTPUT CURRENT 100 +57V +48V +42V OUTPUT CURRENT (A) Figure 1. MAX5974A ...

Page 7

Figure 4. MAX5974A EV Kit Schematic _______________________________________________________________________________________ MAX5974A Evaluation Kit 7 ...

Page 8

MAX5974A Evaluation Kit Figure 5. MAX5974A EV Kit Component Placement Guide—Component Side Figure 6. MAX5974A EV Kit PCB Layout—Component Side 8 ______________________________________________________________________________________ 1.0” 1.0” ...

Page 9

Figure 7. MAX5974A EV Kit PCB Layout—GND Layer 2 Figure 8. MAX5974A EV Kit PCB Layout—Signal Layer 3 _______________________________________________________________________________________ MAX5974A Evaluation Kit 1.0” 1.0” 9 ...

Page 10

MAX5974A Evaluation Kit Figure 9. MAX5974A EV Kit PCB Layout—Solder Side Figure10. MAX5974A EV Kit Component Placement Guide—Solder Side 10 _____________________________________________________________________________________ 1.0” 1.0” ...

Page 11

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2011 Maxim Integrated Products © ...

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