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LX1570CDMT

更新时间： 2024-11-23 12:58:07

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
Switching Controller, Current-mode, 1A, 100kHz Switching Freq-Max, PDSO8

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技术参数
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LX1570CDMT 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	PLASTIC, SOIC-8	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.81	Is Samacsys：	N
模拟集成电路 - 其他类型：	SWITCHING CONTROLLER	控制模式：	CURRENT-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	25 V
最小输入电压：	11 V	标称输入电压：	15 V
JESD-30 代码：	R-PDSO-G8	JESD-609代码：	e0
长度：	4.9 mm	功能数量：	1
端子数量：	8	最高工作温度：	70 °C
最低工作温度：		最大输出电流：	1 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP8,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	认证状态：	Not Qualified
座面最大高度：	1.75 mm	子类别：	Switching Regulator or Controllers
表面贴装：	YES	切换器配置：	SINGLE
最大切换频率：	115 kHz	温度等级：	COMMERCIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
宽度：	3.9 mm	Base Number Matches：	1

LX1570CDMT 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

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与LX1570CDMT相关器件

型号	品牌	获取价格	描述	数据表
LX1570CDM-TR	MICROSEMI	获取价格	暂无描述
LX1570CM	MICROSEMI	获取价格	AC Synchronous. Secondary-Side Controller
LX1570IDM	MICROSEMI	获取价格	AC Synchronous. Secondary-Side Controller
LX1570IDMT	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 115kHz Switching Freq-Max, PDSO8, PLASTIC, SOIC-8
LX1570IDM-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, PDSO8, LEAD FREE, PLASTIC, SOIC-8
LX1570IM	MICROSEMI	获取价格	AC Synchronous. Secondary-Side Controller
LX1570MY	MICROSEMI	获取价格	AC Synchronous. Secondary-Side Controller
LX1570MY-TR	MICROSEMI	获取价格	Switching Controller
LX1571	MICROSEMI	获取价格	PHASE MODULATED AC SYNCHRONOUS SECONDARY-SIDE CONTROLLER
LX1571CDM	MICROSEMI	获取价格	AC Synchronous. Secondary-Side Controller

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