LT1249CN8PBF

更新时间： 2024-11-23 13:09:35

品牌	Logo	应用领域
凌特 - Linear		稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数	文件大小	规格书
12页	194K
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LT1249CN8PBF 数据手册

LT1249

Power Factor Controller

FEATURES

DESCRIPTIO

The 8-pin LT^®1249 provides active power factor correc-

tion for universal offline power systems with very few

externalparts.ByusingfixedhighfrequencyPWMcurrent

averaging without the need for slope compensation, the

LT1249 achieves far lower line current distortion, with a

smallermagneticelementthansystemsthatuseeitherpeak

current detection or zero current switching approach, in

both continuous and discontinuous modes of operation.

■

Standard 8-Pin Packages

■

High Power Factor Over Wide Load Range

with Line Current Averaging

■

International Operation Without Switches

■

Instantaneous Overvoltage Protection

■

Minimal Line Current Dead Zone

■

Typical 250µA Start-Up Supply Current

■

Rejects Line Switching Noise

■

Synchronization Capability

The LT1249 uses a multiplier containing a square gain

function from the voltage amplifier to reduce the AC gain

at light output load and thus maintains low line current

distortion and high system stability. The LT1249 also

provides filtering capability to reject line switching noise

which can cause instability when fed into the multiplier.

Line current dead zone is minimized with low bias voltage

at the current input to the multiplier.

■

Low Quiescent Current: 9mA

■

Fast 1.5A Peak Current Gate Driver

APPLICATIO S

■

Universal Power Factor Corrected Power Supplies

Preregulators up to 1500W

■

The LT1249 provides many protection features including

peak current limiting and overvoltage protection. The

switching frequency is internally set at 100kHz.

While the LT1249 simplifies PFC design with minimal

parts count, the LT1248 provides flexibilities in switching

frequency, overvoltage and current limit.

, LTC and LT are registered trademarks of Linear Technology Corporation.

BLOCK DIAGRA

GND

OUT

7.5V

REF

MOUT

–

7.5V

SENSE

–

RUN

250µA MAX

16V/10V

MULTIPLIER

²I

32k

200µA²

–

GTDR

15µA

= 1/3k

RUN

0.7V

–

OSC

–

SYNC

16V

44µA

22µA

20µA

35pF

1249 BD

12 3 4 5 6 7...12

中文翻译

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与LT1249CN8PBF相关器件

型号	品牌	获取价格	描述	数据表
LT1249CS8	Linear	获取价格	Power Factor Controller
LT1249CS8#PBF	Linear	获取价格	LT1249 - Power Factor Controller; Package: SO; Pins: 8; Temperature Range: 0°C to
LT1249CS8#TRPBF	Linear	获取价格	LT1249 - Power Factor Controller; Package: SO; Pins: 8; Temperature Range: 0°C to
LT1249I	Linear	获取价格	Power Factor Controller
LT1249IN8	Linear	获取价格	Power Factor Controller
LT1249IN8#PBF	Linear	获取价格	LT1249 - Power Factor Controller; Package: PDIP; Pins: 8; Temperature Range: -40°C
LT1249IS8	Linear	获取价格	Power Factor Controller
LT1249IS8#TR	Linear	获取价格	LT1249 - Power Factor Controller; Package: SO; Pins: 8; Temperature Range: -40°C t
LT1249IS8#TRPBF	Linear	获取价格	LT1249 - Power Factor Controller; Package: SO; Pins: 8; Temperature Range: -40°C t
LT124XC	Linear	获取价格	High Speed Current Mode Pulse Width Modulators

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