MAX5941B

更新时间： 2024-11-19 04:41:51

品牌	Logo	应用领域
美信 - MAXIM		控制器以太网
页数	文件大小	规格书
24页	372K
描述
IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices

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MAX5941B 数据手册

19-3069; Rev 4; 6/06

IEEE 802.3af-Compliant Power-Over-Ethernet

Interface/PWM Controller for Power Devices

General Description

Features

The MAX5941A/MAX5941B integrate a complete power

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

(PoE) system. The MAX5941A/MAX5941B provide a PD

interface and a compact DC-DC PWM controller suitable

for flyback and forward converters in either isolated or

nonisolated designs.

ꢀ 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

The MAX5941A/MAX5941B 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.

Integrated MOSFET for Isolation and Inrush

Current Limiting

Gate Output Allows External Control of the

Internal Isolation FET

Programmable Inrush Current Control

Programmable Undervoltage Lockout

ꢀ PWM Controller

The MAX5941A/MAX5941B also integrate all the building

blocks necessary for implementing DC-DC fixed-

frequency isolated power supplies. These devices are 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 fre-

quency is internally trimmed to 275kHz 10ꢀ, thus

reducing magnetics and filter components. The

MAX5941A allows an 85ꢀ operating duty cycle and can

be used to implement flyback converters. The MAX5941B

limits the operating duty cycle to less than 50ꢀ and can

be used in single-ended forward converters. The

MAX5941A/MAX5941B are designed to work with or with-

out an external diode bridge in front of the PD.

Wide Input Range: 18V to 67V

Current-Mode Control

Leading-Edge Blanking

Internally Trimmed 275kHz 10ꢀ Oscillator

Soft-Start

Ordering Information

PIN-

PACKAGE

MAX DUTY

CYCLE (ꢀ)

PART

TEMP RANGE

MAX5941AESE -40°C to +85°C 16 SO (S16M-6)

MAX5941ACSE 0°C to +70°C 16 SO (S16M-6)

MAX5941BESE -40°C to +85°C 16 SO (S16M-6)

MAX5941BCSE 0°C to +70°C 16 SO (S16M-6)

The MAX5941A/MAX5941B are available in 16-pin SO

packages.

Applications

IP Phones

Wireless Access Nodes

Internet Appliances

Computer Telephony

Security Cameras

Pin Configuration

TOP VIEW

V+

16 V

15 NDRV

14 V-

Power Devices in Power-Over-Ethernet/

Power-Over-MDI

OPTO

SS_SHDN

ULVO

MAX5941A

MAX5941B

13 CS

12 GND

11 PGOOD

10 PGOOD

Typical Operating Circuit appears at end of data sheet.

RCL

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.

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与MAX5941B相关器件

型号	品牌	获取价格	描述	数据表
MAX5941BCSE	MAXIM	获取价格	IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices
MAX5941BCSE+	MAXIM	获取价格	暂无描述
MAX5941BCSE+	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, 0.150 INCH, MS-012AC, SOP-16
MAX5941BCSE+T	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 1 Channel, BICMOS, PDSO16, SOIC-28/16
MAX5941BESE	MAXIM	获取价格	IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices
MAX5941BESE+	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 1 Channel, BICMOS, PDSO16, 0.150 INCH, MS-012AC,
MAX5941BESE+T	MAXIM	获取价格	暂无描述
MAX5941BESE-T	MAXIM	获取价格	Power Supply Support Circuit, Adjustable, 1 Channel, BICMOS, PDSO16, 0.150 INCH, MS-012AC,
MAX5942A	MAXIM	获取价格	IEEE 802.3af Power-Over-Ethernet Interface/PWM Controller for Power Devices
MAX5942A\|MAX5942B	MAXIM	获取价格	IEEE 802.3af Power-Over-Ethernet Interface/PWM Controller for Power Devices

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