Datasheet > LT1249

LT1249

更新时间： 2024-11-25 22:55:47

品牌	Logo	应用领域
凌特 - Linear		控制器
页数	文件大小	规格书
12页	146K
描述
Power Factor Controller

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LT1249 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

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