Rainbow-electronics MAX5953D Uživatelský manuál stáhnout pdf

General Description

The MAX5953A/MAX5953B/MAX5953C/MAX5953D

integrate a complete power IC solution for Powered

Devices (PD) in a Power-Over-Ethernet (PoE) system, in

compliance with the IEEE 802.3af standard. The

MAX5953A/MAX5953B/MAX5953C/MAX5953D provide

the PD with a detection signature, a classification sig-

nature, and an integrated isolation switch with program-

mable inrush current control. These devices also

integrate a voltage-mode PWM controller with two

power MOSFETs connected in a two-switch voltage-

clamped DC-DC converter configuration.

An integrated MOSFET provides PD isolation during

detection and classification. All devices guarantee a

leakage current offset of less than 10µA during the

detection phase. A programmable current limit pre-

vents high inrush current during power-on. The devices

feature power-mode undervoltage lockout (UVLO) with

wide hysteresis and long deglitch time to compensate

for twisted-pair-cable resistive drop and to assure

glitch-free transition between detection, classification,

and power-on/-off phases. The MAX5953A/MAX5953C

have an adjustable UVLO threshold with the default

value compliant to the 802.3af standard, while the

MAX5953B/MAX5953D have a lower and fixed UVLO

threshold compatible with some legacy pre-802.3af

power-sourcing equipment (PSE) devices.

The DC-DC converters are operable in either forward or

flyback configurations with a wide input voltage range

from 11V to 76V and up to 15W of output power. The

voltage-clamped power topology enables full recovery

of stored magnetizing and leakage inductive energy for

enhanced efficiency and reliability. When using the

high-side MOSFET, the controller can be configured as

a buck converter. A look-ahead signal for driving sec-

ondary-side synchronous rectifiers can be used to

increase efficiency. A wide array of protection features

include UVLO, over-temperature shutdown, and short-

circuit protection with hiccup current limit for enhanced

performance and reliability. Operation up to 500kHz

allows for smaller external magnetics and capacitors.

The MAX5953A/MAX5953B/MAX5953C/MAX5953D are

available in a high-power (2.22W), 7mm x 7mm ther-

mally enhanced thin QFN package.

Features

♦ Powered Device Interface

Fully Integrated IEEE 802.3af-Compliant PD

Interface

PD Detection and Programmable Classification

Signatures

Less than 10µA Leakage Current Offset During

Detection

Integrated MOSFET for Isolation and Inrush

Current Limiting

Gate Output Allows External Control of the

Internal Isolation MOSFET

Programmable Inrush Current Control

Programmable Undervoltage Lockout

(MAX5953A/MAX5953C)

♦ DC-DC Converter

Clamped, Two-Switch Power IC for High

Efficiency

Integrated High-Voltage 0.4Ω Power MOSFETs

Up to 15W Output Power

Bias Voltage Regulator with Automatic High-

Voltage Supply Turn-Off

11V to 76V Wide Input Voltage Range

Feed-Forward Voltage-Mode Control for Fast

Input Transient Rejection

Programmable Undervoltage Lockout

Overtemperature Shutdown

Indefinite Short-Circuit Protection with

Programmable Fault Integration

Integrated Look-Ahead Signal for Secondary-

Side Synchronous Rectification

> 90% Efficiency with Synchronous

Rectification

Up to 500kHz Switching Frequency

♦ High-Power (2.22W), 7mm x 7mm Thermally

Enhanced Lead-Free Thin QFN Package

MAX5953A/MAX5953B/MAX5953C/MAX5953D

IEEE 802.3af PD Interface and PWM Controllers

with Integrated Power MOSFETs

________________________________________________________________ Maxim Integrated Products 1

PART PIN-PACKAGE PKG CODE

MAX5953AUTM+* 48 TQFN T4877-6

MAX5953BUTM+ 48 TQFN T4877-6

MAX5953CUTM+* 48 TQFN T4877-6

MAX5953DUTM+* 48 TQFN T4877-6

Ordering Information

19-3945; Rev 0; 1/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Operating junction temperature range is 0°C to +125°C.

+Denotes lead-free package.

*Future product—contact factory for availability.

Pin Configuration and Typical Operating Circuit appear at

end of data sheet.

IEEE 802.3af Powered

Devices

IP Phones

Wireless Access Nodes

Internet Appliances

Security Cameras

Computer Telephony

Applications

1 2 3 4 5 6 ... 26 27

Shrnutí obsahu

Strany 1 - Applications

General DescriptionThe MAX5953A/MAX5953B/MAX5953C/MAX5953Dintegrate a complete power IC solution for PoweredDevices (PD) in a Power-Over-Ethernet (PoE

Strany 2 - ELECTRICAL CHARACTERISTICS

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs10 ______________________________________

Strany 3

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

Strany 4

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs12 ______________________________________

Strany 5

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

Strany 6

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs14 ______________________________________

Strany 7

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

Strany 8

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs16 ______________________________________

Strany 9

The two-switch power topology recovers energy storedin both the magnetizing and the parasitic leakage induc-tances of the transformer. The Typical App

Strany 10 - Pin Description

MAX5953A/MAX5953B/MAX5953C/MAX5953DSoft-StartProgram the MAX5953A/MAX5953B/MAX5953C/MAX5953D soft-start with an external capacitor (CCSS)connected bet

Strany 11 - Pin Description (continued)

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

Strany 12 - Typical Application Circuit

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs2 _______________________________________

Strany 13 - MAX5953A

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs20 ______________________________________

Strany 14

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

Strany 15 - Detailed Description

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs22 ______________________________________

Strany 16

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

Strany 17 - Internal Regulators

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs24 ______________________________________

Strany 18 - Applications Information

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

Strany 19

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs26 ______________________________________

Strany 20

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETsMaxim cannot assume responsibility for us

Strany 21 - Table 3. Component Suppliers

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

Strany 22 - Block Diagrams

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs4 _______________________________________

Strany 23 - Block Diagrams (continued)

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

Strany 24 - Typical Operating Circuit

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs6 _______________________________________

Strany 25 - Pin Configuration

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

Strany 26 - Package Information

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs8 _______________________________________

Strany 27 - M. Quijano

MAX5953A/MAX5953B/MAX5953C/MAX5953DIEEE 802.3af PD Interface and PWM Controllerswith Integrated Power MOSFETs_________________________________________

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