LT3575 Linear Technology, LT3575 Datasheet

LT3575

Manufacturer Part Number

LT3575

Description

Isolated Flyback Converter Without An Opto-Couple

Manufacturer

Linear Technology

Datasheet

1.LT3575.pdf (24 pages)

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DataSheet.in

FEATURES

APPLICATIONS

TYPICAL APPLICATION

12V TO 24V

28.7k

3V to 40V Input Voltage Range

2.5A, 60V Integrated NPN Power Switch

Boundary Mode Operation

No Transformer Third Winding or

Optoisolator Required for Regulation

Improved Primary-Side Winding Feedback

Load Regulation

BIAS Pin for Internal Bias Supply and Power

NPN Driver

Programmable Soft-Start

Programmable Power Switch Current Limit

Thermally Enhanced 16-Lead TSSOP

Industrial, Automotive and Medical Isolated

Power Supplies

OUT

Set with Two External Resistors

10k

357k

51.1k

10nF

SHDN/UVLO

ILIM

11.5k

5V Isolated Flyback Converter

4.7nF

GND

LT3575

TEST BIAS

3575 TA01

REF

4.7

80.6k

0.22

6.04k

3:1

2.6

Isolated Flyback Converter

DESCRIPTION

The LT

ally designed for the isolated ﬂ yback topology. No third

winding or optoisolator is required for regulation. The

part senses the isolated output voltage directly from the

primary side ﬂ yback waveform. A 2.5A, 60V NPN power

switch is integrated along with all control logic into a

16-lead TSSOP package.

The LT3575 operates with input supply voltages from

3V to 40V, and can deliver output power up to 14W with

no external power switch.The LT3575 utilizes boundary

mode operation to provide a small magnetic solution with

improved load regulation.

The output voltage is easily set with two external resistors

and the transformer turns ratio. Off the shelf transformers

are available for many applications.

L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks

and No RSENSE and ThinSOT is a trademark of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

without an Opto-Coupler

5V, 1.4A

OUT

–

3575 is a monolithic switching regulator speciﬁ c-

–1

–2

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

Load Regulation

= 12V

OUT

(A)

= 24V

LT3575

3575 TA01b

3575f

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