lt1725cs-trpbf Linear Technology Corporation, lt1725cs-trpbf Datasheet

lt1725cs-trpbf

Manufacturer Part Number

lt1725cs-trpbf

Description

General Purpose Isolated Flyback Controller

Manufacturer

Linear Technology Corporation

Datasheet

1.LT1725CS-TRPBF.pdf (28 pages)

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FEATURES

APPLICATIO S

■

TYPICAL APPLICATIO

■

All other trademarks are the property of their respective owners.

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

Drives External Power MOSFET with External

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

Telecom Isolated Converters

Offline Isolated Power Supplies

Instrumentation Power Supplies

SENSE

35.7k

3.01k

1nF

0.1µF

Resistor

2.7k

51k

47pF

SFST

OSCAP

ENDLY

MENAB

SGND

OCMP

CMPC

OUT

LT1725

PGND

SENSE

UVLO

GATE

48V to Isolated 5V Converter

15µF

100pF

22Ω

BAS16

33k

820k

47k

1µF

36V TO 72V

1.5µF

68Ω

150pF

CTX02-14989

0.18Ω

IRF620

1725 TA01a

12CWQ06

150µF

18Ω

DESCRIPTIO

The LT

ler specifically designed for the isolated flyback topology.

It drives the gate of an external MOSFET and is generally

powered from a third transformer winding. These features

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.

The LT1725 has a number of features not found on most

other switching regulator ICs. By utilizing current mode

switching techniques, it provides excellent AC and DC line

regulation. Its unique control circuitry can maintain regu-

lation well into discontinuous mode in most applications.

Optional load compensation circuitry allows for improved

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.

470pF

Isolated Flyback Controller

1725 is a monolithic switching regulator control-

51Ω

OUT

= 0 to 2A

= 5V

4.75

5.25

5.00

General Purpose

Output Load Regulation

0.5

= 36V

= 72V

LOAD

1.0

(A)

= 48V

LT1725

1.5

1725 F10b

2.0

1725fa

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