Rainbow-electronics MAX5971B Instrukcja Użytkownika Pobierz pdf (Strona 1)

_______________________________________________________________ Maxim Integrated Products 1

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.

MAX5971B

Single-Port, 40W, IEEE 802.3af/at,

PSE Controller with I

19-5336; Rev 0; 6/10

General Description

The MAX5971B is a single-port power controller designed

for use in IEEE

802.3af/at-compliant power-sourcing

equipment (PSE). This device provides powered device

(PD) discovery, classification, current limit, and DC and

AC load-disconnect detections. The MAX5971B sup-

ports both fully automatic operation and software pro-

grammability, and features an integrated power MOSFET

and sense resistor. The device supports detection and

classification operation from a single 54V supply. In

addition, it supports 2-event classification and new Class

5 classification of high-power PDs. The MAX5971B pro-

vides up to 40W to a single port (Class 5 enabled) and

still provides high-capacitance detection for legacy PDs.

The device provides four operating modes to suit differ-

ent system requirements. By default, auto mode allows

the device to operate automatically at its default settings

without any software. Semiautomatic mode automatically

detects and classifies a device connected to the port

after initial software activation, but does not power the

port until instructed to by software. Manual mode allows

total software control of the device and is useful for

system diagnostics. Shutdown mode terminates all port

activities and securely turns off power to the port.

The IC features an I

C-compatible, 2-wire serial inter-

face, and is fully software-configurable and program-

mable. The device provides instantaneous readout of

port current through the I

C interface. The device’s

extensive programmability enhances system flexibility,

enables field diagnosis and allows for uses in other, non

standard applications.

The device provides input undervoltage lockout (UVLO),

input undervoltage detection, input overvoltage lockout,

overtemperature protection, output voltage slew-rate limit

during startup, and LED status indication. The MAX5971B

programmability includes startup timeout, overcurrent

timeout, and load-disconnect detection timeout.

The device is available in a space-saving, 28-pin TQFN

(5mm x 5mm) power package and is rated for the

extended (-40NC to +85NC) temperature range.

Applications

Single-Port PSE End-Point Applications

Single-Port PSE Power Injectors (Midspan Applications)

Switches/Routers

Features

S IEEE 802.3af/at Compliant

S Up to 40W for Single-Port PSE Applications

S Integrated Power MOSFET and Sense Resistor

S Supports 54V Single-Supply Operation

S PD Detection and Classification

S I

C-Compatible, 2-Wire Serial Interface

S Instantaneous Readout of Port Current Through

C Interface

S Programmable Current Limit for Class 5 PDs

S High-Capacitance Detection for Legacy Devices

S Supports Both DC and AC Load Removal

Detections

S Current Foldback and Duty-Cycle-Controlled

Current Limit

S LED Indicator for Port Status

S Direct Fast-Shutdown Control Capability

S Space-Saving, 28-Pin TQFN (5mm x 5mm) Power

Package

Ordering Information

IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc.

Typical Operating Circuit

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX5971BETI+

-40NC to +85NC

28 TQFN-EP*

-54V

AGND

SDA SCL AD0 INT

LED

PWMEN

EE_DIG

LEGACY

MIDSPAN

OSC

OUT

OUTP

DET

ILIM1

ILIM2

MAX5971B

PSE OUTPUT

SERIAL INTERFACE

1 2 3 4 5 6 ... 45 46

Podsumowanie treści

Strona 1 - PSE Controller with I

_______________________________________________________________ Maxim Integrated Products 1For pricing, delivery, and ordering information, pleas

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Strona 41 - Table 40. Register Summary

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

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