LT1248C

更新时间： 2024-11-22 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	158K
描述
Power Factor Controller

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LT1248C 数据手册

LT1248

Power Factor Controller

FEATURES

DESCRIPTIO

The LT^®1248 provides active power factor correction for

universal off-line power systems. By using fixed high

frequency PWM current averaging, without the need for

slope compensation, the LT1248 achieves far lower line

current distortion with a smaller magnetic element than

systems that use either peak-current detection or zero

current switching approaches in both continuous and

discontinuous modes of operation.

■

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

■

Low Quiescent Current: 9mA

The LT1248 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 LT1248 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.

■

Fast 1.5A Peak Current Gate Driver

APPLICATIO S

■

Universal Power Factor Corrected Power Supplies

Preregulators Up To 1500W

■

The LT1248 provides many protection features including

peak current limiting and overvoltage protection, and can

be operated at frequencies as high as 300kHz.

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

BLOCK DIAGRA

GND

LIM

OUT

OUT SENSE

REF

OUT

–

7.5V

REF

–

16V TO 10V

RUN

2.6V/

–

2.2V

7.5V

EN/SYNC

7µA

2.2V

–

SENSE

–

²I

32k

200µA²

–

7.9V

OVP

–

RUN

0.7V

SYNC

GTDR

–

ONE SHOT

200ns

OSC

12µA

1 6V

1248 BD

SET

12 3 4 5 6 7...12

中文翻译

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