LR2257 datasheet(1/8 Pages) LRC

Part #	LR2257

Description	AC/DC Current Mode PWM power management controller

PDF	8 Pages

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Manufacturer	LRC [Leshan Radio Company]

Direct Link	http://www.lrc.cn/

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AC/DC Current Mode PWM

power management controller

Absolute Maxim Ratings

Item

Symbol

Typical

Unit

Power Supply

VDD

9～12

V

FB Start Voltage

Vs

5

V

FB Under-voltage Threshold

Vu

3.5

V

FB Clamp Voltage

Vo

5.5

V

FB input current

IFB

<1

mA

Switching Frequency

Fs

65

KHz

Maximum Duty Cycle

DMAX

75

％

FB－SW Current Gain

GF

0.3

A/V

Current Limit

ILIM

400

mA

SW Break Down Voltage

Vsw

>400

V

Stand By Current

PS

<0.3W

W

System Efficiency (Full Load)

η

>70

%

65kHz Switching Frequency

Emitter Drive of Internal Power Transistor

Over-Current

Protection,

Over

and

Under-voltage Protection

Current Mode PWM

Low Power for Green Environments

Protection, as lower as 0.3W

Lowest Total Cost Solution

Etc.

Offline Power Generator

Power Adapter

The LR2257 AC—DC is a high

efficiency current-mode PWM power

supply controller that drives an internal

NPN transistor for high voltage switching.

Apply with BiCMOS technology, the

device consist of Bandgap reference

voltage, Oscillator, High voltage switching

transistor and build in safety features of

over current and over voltage protection

mechanisms

Delivering up to 3W yet consumes, the

typical application of the device will

include:

Battery Charger, such as handset phone

LR2257

1/8

LESHAN RADIO COMPANY, LTD.

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LR2257 Datasheet(PDF) 1 Page - Leshan Radio Company

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