LX1571

更新时间： 2024-11-18 22:46:51

品牌	Logo	应用领域
美高森美 - MICROSEMI		控制器
页数	文件大小	规格书
12页	259K
描述
PHASE MODULATED AC SYNCHRONOUS SECONDARY-SIDE CONTROLLER

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LX1571 数据手册

LIN DOC #: 1570

P A T E N T P E N D I N G

LX1570/1571

PHASE

MODULATED AC SYNCHRONOUS

ECONDARY-SIDE

ONTROLLER

T H E I N F I N I T E P O W E R O F I N N O V A T I O N

P R E L I M I N A R Y D A T A S H E E T

DESCRIPTION

KEY FEATURES

p REPLACES COSTLY MAG-AMP CORES WITH

The LX1570/71 series of controller ICs are

designed to provide all control functions in

a secondary-side regulator for isolated auxil-

iary or secondary power supplies. Auxiliary

or secondary-side controllers are used in a

variety of applications including multiple

output off-line power supplies, commonly

found in desktop computers, as well as tele-

communications applications. Although they

can be used in all secondary output applica-

tions requiring precision regulation, they are

mainly optimized for outputs delivering more

than 3A current where standard three-termi-

nal regulators lack the desired efficiency. For

these applications, the Mag Amp regulators

have traditionally been used. However, Mag

Amps have several disadvantages. First, be-

cause they have to withstand the maximum

input voltage during a short-circuit condition,

they are "over designed", typically by 2 times,

increasing the cost and size of the power

supply. Second, Mag Amps are inherently

leading edge modulators, so they can only

approach a certain maximum duty cycle, lim-

ited by the minimum delay and the mag-

netic BH loop characteristic of the Mag Amp

core. This forces an increase in the size of

the main transformer as well as the output

inductor, resulting in higher overall system

cost. The LX1570/71 eliminates all the

disadvantages of the Mag Amp approach

as well as improving system perfor-

mance and reducing overall system cost.

The LX1570/71 is a current mode control-

ler IC that controls the duty cycle of a switch

in series with the secondary AC output of

the power transformer in buck-derived ap-

plications, such as forward or bridge topolo-

gies. It offers features such as 100% duty

cycle operation for maximum energy trans-

fer, pulse-by-pulse and hiccup current limit-

ing with long off-time between the cycles

for reduced power dissipation, high-fre-

quency operation for smaller magnetics, soft-

start, and current mode control for excel-

lent dynamic response.

A LOW ON-RESISTANCE MOSFET

p LOOK-AHEAD SWITCHING^TMENSURES

SWITCH TURN ON BEFORE THE AC INPUT

TO ACHIEVE 100% ENERGY TRANSFER

p LOWER OVERALL SYSTEM COST

p LOWER PEAK CURRENT STRESS ON THE

PRIMARY SWITCH

p ALLOWS HIGHER OPERATING FREQUENCY

AND SMALLER OUTPUT INDUCTOR

p EASY SHORT-CIRCUIT PROTECTION

p CURRENT MODE APPROACH ACHIEVES

EXCELLENT DYNAMIC RESPONSE

APPLICATIONS

■ SECONDARY-SIDE REGULATOR IN OFF-LINE

POWER SUPPLIES

■ COMPUTER POWER SUPPLIES, 3.3V OUTPUT

FOR NEW LOW-VOLTAGE PROCESSORS

AND MEMORIES

■ TELECOMMUNICATION AND MILITARY

DC/DC CONVERTERS

PRODUCT HIGHLIGHT

AVA I L A B L E OP T I O N S P E R PA R T #

Aux Output

12V/8A

C.L.

C.S.

Part #

Application

Threshold

Option

Output

Currents

< 4A

Resistive

Sensing

LX1570 -0.2V

Current

Output

LX1571

Transformer Currents

Sensing

> 4A

OUT

C.S.

DRV

V_CC

V_FB

LX1571

COMP

S.S.

C_T

GND

PACKAGE ORDER INFORMATION

Plastic DIP

8-pin

Plastic SOIC

8-pin

Ceramic DIP

8-pin

T_A(°C)

0 to 70

-40 to 85

-55 to 125

LX157xCM

LX157xIM

—

LX157xCDM

LX157xIDM

—

LX157xMY

Note: All surface-mount packages are available in Tape & Reel.

Append the letter "T" to part number. (i.e. LX157xCDMT)

F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1

Rev. 0.9.3 1/97

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841

12 3 4 5 6 7...12

中文翻译

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与LX1571相关器件

型号	品牌	获取价格	描述	数据表
LX1571CDM	MICROSEMI	获取价格	AC Synchronous. Secondary-Side Controller
LX1571CDMT	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 100kHz Switching Freq-Max, PDSO8
LX1571CDM-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, PDSO8, LEAD FREE, PLASTIC, SOIC-8
LX1571CM	MICROSEMI	获取价格	AC Synchronous. Secondary-Side Controller
LX1571CM-TR	MICROSEMI	获取价格	暂无描述
LX1571IDM	MICROSEMI	获取价格	AC Synchronous. Secondary-Side Controller
LX1571IDM-TR	MICROSEMI	获取价格	暂无描述
LX1571IM	MICROSEMI	获取价格	AC Synchronous. Secondary-Side Controller
LX1571MY	MICROSEMI	获取价格	AC Synchronous. Secondary-Side Controller
LX160M0220BPF-2230	YAGEO	获取价格	Aluminum Electrolytic Capacitor, Polarized, Aluminum (wet), 160V, 20% +Tol, 20% -Tol, 220u

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