Datasheet > 1725I

1725I

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
凌特 - Linear		控制器
页数	文件大小	规格书
28页	189K
描述
General Purpose Isolated Flyback Controller

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1725I 数据手册

LT1725

General Purpose

Isolated Flyback Controller

FEATURES

DESCRIPTIO

The LT^®1725 is a monolithic switching regulator control-

ler specifically designed for the isolated flyback topology.

It drives the gate of an external MOSFET and is generally

poweredfromathirdtransformerwinding. Thesefeatures

allow for an application input voltage limited only by

external power path components. The third transformer

winding also provides output voltage feedback informa-

tion, such that an optoisolator is not required. Its gate

drive capability coupled with a suitable external MOSFET

can deliver load power up to tens of watts.

■

Drives External Power MOSFET with External

_SENSEResistor

■

Application Input Voltage Limited Only by

External Power Components

Senses Output Voltage Directly from Primary Side

Winding—No Optoisolator Required

Accurate Regulation Without User Trims

Regulation Maintained Well into Discontinuous Mode

Switching Frequency from 50kHz to 250kHz with

External Capacitor

Optional Load Compensation

Optional Undervoltage Lockout

Available in 16-Pin SO and SSOP Packages

■

The LT1725 has a number of features not found on most

other switching regulator ICs. By utilizing current mode

switchingtechniques, itprovidesexcellentACandDCline

regulation. Its unique control circuitry can maintain regu-

lation well into discontinuous mode in most applications.

Optionalloadcompensationcircuitryallowsforimproved

load regulation. An optional undervoltage lockout pin

halts operation when the application input voltage is too

low. An optional external capacitor implements a soft-

start function. A 3V output is available at up to several mA

for powering primary side application circuitry.

APPLICATIO S

■

Telecom Isolated Converters

■

Offline Isolated Power Supplies

■

Instrumentation Power Supplies

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

TYPICAL APPLICATIO

48V to Isolated 5V Converter

CTX02-14989

Output Load Regulation

470pF

5.25

LT1725

18Ω

36V TO 72V

35.7k

BAS16

OUT

= 48V

= 36V

= 72V

22Ω

47k

= 5V

= 0 to 2A

3.01k

OUT

SFST

1nF

47pF

12CWQ06

15µF

1µF

5.00

4.75

51Ω

68Ω

OSCAP

150pF

820k

33k

UVLO

51k

1.5µF

100pF

150µF

ENDLY

51k

2.7k

MENAB

0.5

1.0

1.5

2.0

(A)

LOAD

GATE

IRF620

OCMP

1725 F10b

SENSE

CMPC

SGND

PGND

0.1µF

0.18Ω

1725 TA01a

1725f

12 3 4 5 6 7...28

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