Datasheet > EF9367C

EF9367C

更新时间： 2024-11-23 23:50:15

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EF9367C 数据手册

19-3024; Rev 0; 10/03

IEEE 802.3af Power-Over-Ethernet

Interface/PWM Controller for Power Devices

General Description

Features

The MAX5942A/MAX5942B integrate a complete power

IC for powered devices (PD) in a power-over-ethernet

(PoE) system. The MAX5942A/MAX5942B provide a PD

interface and a compact DC-DC PWM controller suitable

for flyback and forward converters in either isolated or

nonisolated designs.

o 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 FET

Programmable Inrush Current Control/ULVO

PGOOD/PGOOD Outputs Enable PWM

Controller

The MAX5942A/MAX5942B PD interface complies with

the IEEE 802.3af standard, providing the PD with a detec-

tion signature, a classification signature, and an integrat-

ed isolation switch with programmable inrush current

control. These devices also feature power-mode under-

voltage lockout (UVLO) with wide hysteresis and power-

good status outputs.

The MAX5942A/MAX5942B also integrate all the build-

ing blocks necessary for implementing DC-DC fixed-

frequency isolated power supplies. This device is a

current-mode controller with an integrated high startup

circuit suitable for isolated telecom/industrial voltage

range power supplies. A high-voltage startup circuit

allows the PWM controller to draw power directly from the

18V to 67V input supply during startup. The switching

frequency is internally trimmed to 275kHz 10ꢀ, thus

reducing magnetics and filter components. The

MAX59412A allows an 85ꢀ operating duty cycle and can

be used to implement flyback converters. The MAX5942B

limits the operating duty cycle to less than 50ꢀ and can

be used in single-ended forward converters. The

MAX5942A/MAX5942B are designed to work with or with-

out an external diode bridge in front of the PD.

o PWM Controller

Wide Input Range: 18V to 67V

Isolated (Without Optocoupler) or Nonisolated

Power Supply

Current-Mode Control

Leading-Edge Blanking

Internally Trimmed 275kHz 10ꢀ Oscillator

Soft-Start

Ordering Information

PIN-

MAX DUTY

PACKAGE CYCLE (ꢀ)

PART

TEMP RANGE

MAX5942AESE* -40°C to +85°C

MAX5942ACSE 0°C to +70°C

MAX5942BESE* -40°C to +85°C

MAX5942BCSE

*Future product—contact factory for availability.

16 SO

The MAX5942A/MAX5942B are available in 16-pin SO

packages.

Applications

0°C to +70°C 16 SO

IP Phones

Wireless Access Nodes

Internet Appliances

Computer Telephony

Security Cameras

Pin Configuration

TOP VIEW

V+

16 V

Power Devices in Power-Over-Ethernet/

Power-Over-MDI

15 NDRV

14 V-

SS_SHDN

ULVO

MAX5942A

MAX5942B

13 CS

12 GND

11 PGOOD

10 PGOOD

RCL

Typical Operating Circuit appears at end of data sheet.

GATE

OUT

________________________________________________________________ Maxim Integrated Products

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.

12 3 4 5 6 7...24

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