Datasheet > LTC4278_12

LTC4278_12

更新时间： 2022-11-16 12:20:20

品牌	Logo	应用领域
凌特 - Linear		光电控制器
页数	文件大小	规格书
42页	498K
描述
Synchronous No-Opto Flyback Controller

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LTC4278_12 数据手册

LTC4278

IEEE 802.3at PD with

Synchronous No-Opto Flyback

Controller and 12V Aux Support

DESCRIPTION

FEATURES

The LTC^®4278 is an integrated Powered Device (PD) con-

troller and switching regulator intended for high power

25.5W IEEE 802.3at Compliant (Type 2) PD

10V to 57V Auxiliary Power Input

Shutdown Pin for Flexible Auxiliary Power Support

Integrated State-of-the-Art No-Opto Synchronous

Flyback Controller

IEEE 802.3at and 802.3af applications. With a wide input

voltagerange,theLTC4278isspeciﬁcallydesignedtosup-

port PD applications that include a low-voltage auxiliary

power input such as a 12V wall adaptor. The inclusion of

a shutdown pin provides simple implementation of both

PoE and auxiliary dominate applications. In addition, the

LTC4278supportsboth1-eventand2-eventclassiﬁcations

as deﬁned by the IEEE, thereby allowing the use in a wide

range of product conﬁgurations.

– Isolated Power Supply Efﬁciency >92%

– 88% Efﬁciency Including Diode Bridge and

Hot Swap™ FET

Superior EMI Performance

Robust 100V 0.7Ω (Typ) Integrated Hot Swap MOSFET

IEEE 802.3at High Power Available Indicator

Integrated Signature Resistor and Programmable

Class Current

Undervoltage, Overvoltage and Thermal Protection

Short-Circuit Protection with Auto-Restart

Programmable Soft-Start and Switching Frequency

Complementary Power Good Indicators

Thermally Enhanced 7mm × 4mm DFN Package

TheLTC4278synchronous,currentmode,ﬂybackcontrol-

ler generates multiple supply rails in a single conversion

stepprovidingforthehighestsystemefﬁciencywhilemain-

taining tight regulation across all outputs. The LTC4278

includes Linear Technology’s patented No-Opto feedback

topology to provide full IEEE 802.3 isolation without the

need of an opto-isolator circuit. A true soft-start function

allows graceful ramp-up of all output voltages.

APPLICATIONS

The LTC4278 is available in a space saving 32-lead DFN

package.

L, LT, LTC, LTM, Linear Technology, SwitcherCAD and the Linear logo are registered

trademarks and Hot Swap and ThinSOT are trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. Protected by U.S. Patents,

including 5841643.

VoIP Phones with Advanced Display Options

Dual-Radio Wireless Access Points

PTZ Security Cameras

RFID Readers

Industrial Controls

EPC3472G-LF

TYPICAL APPLICATION

25W PD Solution with 12V Auxiliary

•

0.18µH

47µF

8.2µH

4.5A

•

100µF

AUXILIARY

•

10µF

SUPPLY

(10V TO 57V)

294k

21.5k

3.01k

BSS63

–

1µF

TO MICRO

CONTROLLER

HAT2169

46.4k

FDMS2572

12mΩ

~ +

~ –

54V FROM

DATA PAIR

PDS5100H

0.1µF

–

PG SENSE

UVLO PWRGD T2P

PORTP

SHDN

SENSE

CLASS

LTC4278

24k

30.9Ω

~ +

~ –

CMP

54V FROM

SPARE PAIR

2.2nF

1µF

PORTN

NEG

SYNC GND OSC PGDLY

12k

ENDLY

100k

CMP

•

38.3k 1.8k

B1100

33pF

0.1µF

4278 TA01a

4278fc

12 3 4 5 6 7...42

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与LTC4278_12相关器件

型号	品牌	描述	获取价格	数据表
LTC4278CDKD	Linear	IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support	获取价格
LTC4278CDKD#PBF	Linear	LTC4278 - IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support;	获取价格
LTC4278CDKDPBF	Linear	IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support	获取价格
LTC4278CDKDTRPBF	Linear	IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support	获取价格
LTC4278IDKD	Linear	IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support	获取价格
LTC4278IDKD#PBF	Linear	暂无描述	获取价格

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