LX1554

更新时间： 2024-11-18 22:30:55

品牌	Logo	应用领域
美高森美 - MICROSEMI		/
页数	文件大小	规格书
18页	376K
描述
ULTRA-LOW START-UP CURRENT, CURRENT-MODE PWM

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数据手册

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LX1554 数据手册

LIN DOC #: 1552

LX1552/3/4/5

LTRA-LOW

TART-U

URRENT, CURRENT-MODE PWM

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 O D U C T I O N D A T A S H E E T

DESCRIPTION

KEY FEATURES

■ ULTRA-LOW START-UP CURRENT

The LX155X family of ultra-low start-up

current (250µA max.), current mode

control IC's offer new levels of energy

efficiency for offline converter applica-

tions. They are ideally optimized for

personal computer and CRT power

supplies although they can be used in

any number of off-line applications

where energy efficiency is critical.

Coupled with the fact that the LX155X

series requires a minimal set of external

components, the series offers an

tion. Additionally, the precise oscillator

discharge current gives the power

supply designer considerable flexibility

in optimizing system duty cycle

consistency.

(150µA typ.)

■ TRIMMED OSCILLATOR DISCHARGE

CURRENT (±±2 typ.)

■ INITIAL OSCILLATOR FREQUENCY BETTER

THAN ±±4

The current mode architecture

■ OUTPUT PULLDOWN DURING UVLO

■ PRECISION 2.5V REFERENCE (±±2 max.)

p CURRENT SENSE DELAY TO OUTPUT

(150ns typ.)

p AUTOMATIC FEED FORWARD

COMPENSATION

p PULSE-BY-PULSE CURRENT LIMITING

demonstrates improved load regulation,

pulse by pulse current limiting and

inherent protection of the power supply

output switch. The LX155X includes a

bandgap reference trimmed to 1%, an

error amplifier, a current sense com-

parator internally clamped to 1V, a high

current totem pole output stage for fast

switching of power mosfet's, and an

externally programmable oscillator to

set operating frequency and maximum

duty cycle. The undervoltage lock-out

circuitry is designed to operate with as

little as 250µA of supply current

permitting very efficient bootstrap

designs.

excellent value for cost conscious

consumer applications.

p ENHANCED LOAD RESPONSE

CHARACTERISTICS

p UNDER-VOLTAGE LOCKOUT WITH

HYSTERESIS

p DOUBLE PULSE SUPPRESSION

p HIGH CURRENT TOTEM POLE OUTPUT

Optimizing energy efficiency, the

LX155X series demonstrates a signifi-

cant power reduction as compared with

other similar off-line controllers. Table 1

compares the SG384X, UC384XA and

the LX155X start-up resistor power

dissipation. The LX155X offers an

overall 4X reduction in power dissipa-

(±1Amp peak)

p 500kHz OPERATION

APPLICATIONS

PRODUCT HIGHLIGHT

■ ECONOMY OFF-LINE FLYBACK OR

FORWARD CONVERTERS

TYPICAL APPLICATION OF LX155X USING ITS

MICROPOWER START-UP FEATURE

■ DC-DC BUCK OR BOOST CONVERTERS

■ LOW COST DC MOTOR CONTROL

T A B L E 1

A V A I L A B L E O P T I O N S P E R P A R T #

Design Using

SG384x UC384xA LX155x

Part #

Start-Up Hysteresis Max. Duty

Max. Start-up Current

Specification (I_ST)

1000µA 500µA 250µA

Voltage

16V

Cycle

<100%

<50%

Typical Start-Up

Resistor Value (R_ST)

INPUT

LX1552

LX1553

LX1554

LX1555

0.8V

62KΩ 124KΩ 248KΩ

8.4V

16V

Max. Start-Up Resistor

Power Dissipation (P_R)

2.26W 1.13W 0.56W

LX1552

Note: Calculation is done for universal AC input speci-

fication of V_ACMIN= 90V_RMSto V_ACMAX= 265V_RMSusing the

following equation: (Resistor current is selected to be

LX1554

8.4V

0.8V

I_STat V_ACMIN.)

V_{AC MIN}

2V_AC

MAX

R_ST

, P_R=

√2

R_ST

PACKAGE ORDER INFORMATION

Plastic DIP

8-pin

Plastic SOIC

8-pin

Plastic SOIC

14-pin

Ceramic DIP

8-pin

TSSOP

20-pin

T_A(°C)

0 to 70

-40 to 85

-55 to 125

LX155xCM

LX155xCDM

LX155xIDM

—

LX155xCD

LX155xID

—

LX155xCPW

LX155xIM

—

LX155xMY

Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX1552CDMT)

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. 1.0a 1/01

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841

12 3 4 5 6 7...18

中文翻译

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与LX1554相关器件

型号	品牌	获取价格	描述	数据表
LX1554CDMT	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8, PLASTIC, SOIC-8
LX1554CDM-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8, ROHS COMPLIANT,
LX1554CDT	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14, PLASTI
LX1554CD-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO14, ROHS COMPLIANT,
LX1554CPWT	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO20, TSSOP-
LX1554CPW-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO20, ROHS COMPLIANT,
LX1554IDMT	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8, PLASTIC
LX1554IDM-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8, ROHS COMPLIANT,
LX1554IDT	MICROSEMI	获取价格	暂无描述
LX1554ID-TR	MICROSEMI	获取价格	Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO14, ROHS COMPLIANT,

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