LX1681

更新时间： 2024-11-10 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
9页	127K
描述
VOLTAGE - MODE PWM CONTROLLERS

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中文翻译

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数据手册

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LX1681 数据手册

LX1681/ 1682

V OLTAGE- MODE PWM CONTROLLERS

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

D E S C R I P T I O N

K E Y F E A T U R E S

■ Fixed 200kHz Switching Frequency

The LX1 681 /1 682 are monolithic, pulse-

width modulator controller ICs. They are

designed to implement a flexible, low cost

buck (step-down) regulator supply with mini-

mal external components.

Hiccup-mode fault protection reduces

average power to the power elements during

short-circuit conditions.

Switchingfrequency is fixed at 200kHz

for optimal cost and space.

■ Constant Frequency Voltage-Mode Control

Requires NO External Compensation

■ Hiccup-Mode Over-Current Protection

■ High Efficiency

The LX1 681 is a non-synchronous con-

troller; the LX1682 has a synchronous driver

for higher efficiency.

The output voltage is adjustable by

means of a resistor divider to set the voltage

between 1.25V and 4.5V.

Short-circuit current limiting can be

implemented without expensive current

sense resistors. Current is sensed using the

voltage drop across the R_DS(ON)of the MOSFET

— sensing is delayed for 1µs to eliminate

MOSFET ringing errors.

Under-voltage lockout and soft-start

for optimal start-up performance. The

LX1681/82 can be disabled by pulling the soft-

start pin to ground.

Small 8-pin SOIC packaging reduces

board space.

Optimized for 5V-to-3.3V or 5V-to-2.5V

conversion, the LX1681/82 can also be used

for converting 12V to 5V, 3.3V or other

voltages with high efficiency, eliminating the

need for bulky heat sinks.

■ Output Voltage Set By Resistor Divider

■ Under-Voltage Lockout

■ Soft-Start And Enable

■ Synchronous Rectification (LX1682)

■ Non-Synchronous Rectification (LX1681)

■ Small, 8-pin Surface Mount Package

A P P L I C A T I O N S

■ 5V to 3.3V Or Less Buck Regulators

■ FPGA Supplies

■ Microprocessor Chipset Supplies

NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.

(e.g. Camino, Whitney, etc.)

■ Rambus^®RIMM^TMSupplies

■ Hard Disk Drives

■ Computer Add-on Cards

P R O D U C T H I G H L I G H T

V_BOOST

12V

V_BOOST

12V

C₃

1µF

C₁

C₃

1µF

C₁

1500µFx2

1500µFx3

V_FB

V_CC

V_FB

V_CC

C_SS

LX1682

0.1µF

LX1681

0.1µF

Q₁

IRL3103S

V_OUT

Q₁

IRL3103S

GND

BDRV

V_C1

V_OUT

N.C.

GND

V_C1

C₂

5µH

C₂

5µH

TDRV

1500µF

SET

D₂

Q₂

MBR2545

IRL3103S

LX1681 NON-SYNCHRONOUS CONTROLLER

LX1682 SYNCHRONOUS CONTROLLER

P A C K A G E O R D E R I N F O R M A T I O N

Plastic SOIC

T (°C)

Output

8-pin

Non-Synchronous

Synchronous

LX1681CDM

0 to 70

LX1682CDM

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

append the letter "T" to part number. (i.e. LX1681CDMT)

L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570

Rev. 1.0 5/ 99

12 3 4 5 6 7...9

中文翻译

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与LX1681相关器件

型号	品牌	获取价格	描述	数据表
LX1681_05	MICROSEMI	获取价格	Voltage-Mode PWM Controllers
LX1681CDM	MICROSEMI	获取价格	VOLTAGE - MODE PWM CONTROLLERS
LX1681CDMT	MICROSEMI	获取价格	Voltage-Mode SMPS Controller
LX1681CDM-TR	MICROSEMI	获取价格	Voltage-Mode PWM Controllers
LX1681IDM	MICROSEMI	获取价格	PWM Controllers
LX1681IDMT	MICROSEMI	获取价格	暂无描述
LX1682	MICROSEMI	获取价格	VOLTAGE - MODE PWM CONTROLLERS
LX1682CDM	MICROSEMI	获取价格	VOLTAGE - MODE PWM CONTROLLERS
LX1682CDMT	MICROSEMI	获取价格	Voltage-Mode SMPS Controller
LX1682CDM-TR	MICROSEMI	获取价格	Voltage-Mode PWM Controllers

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