LT1424-5 Linear Technology, LT1424-5 Datasheet

LT1424-5

Manufacturer Part Number

LT1424-5

Description

Isolated Flyback Switching Regulator with 5V Output

Manufacturer

Linear Technology

Datasheet

1.LT1424-5.pdf (16 pages)

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Download datasheet (142Kb)

FEATURES

TYPICAL APPLICATIO

APPLICATIO S

INPUT

COM

Isolated Communication Supplies

Industrial Automation

Instrumentation Systems

No Transformer “Third Winding” or Optoisolator

Required

Designed for Use with 1:1 Ratio Transformers

Fixed, Application Specific 5V Output Voltage

Regulation Maintained Well into Discontinuous

Mode (Light Load)

Load Compensation Provides Excellent

Load Regulation

Available in 8-Pin PDIP and SO Packages

Operating Frequency: 285kHz

1000pF

100 F

10V

0.1 F

SHDN

SYNC

SGND

LT1424-5

CCOMP

PGND

5V Output Isolated Power Supply

0.1 F

1N5248

MBR0540T4

C1, C2: AVX TPS D107M010R0080

T1: DALE LPE-4841-A307

330pF

ISOLATION

BARRIER

•

DESCRIPTIO

•

The LT

regulator specifically designed for the isolated flyback

topology. No “third winding” or optoisolator is required;

the integrated circuit senses the isolated output voltage

directly from the primary side flyback waveform. A high

current, high efficiency switch is included on the die along

with all oscillator, control and protection circuitry.

The LT1424-5 operates with input supply voltages from

3V to 20V and draws only 7mA quiescent current. It can

deliver up to 400mA at 5V with no external power devices.

By utilizing current mode switching techniques, it pro-

vides excellent AC and DC line regulation.

The LT1424-5 has a number of features not found on other

switching regulator ICs. Its unique control circuitry can

maintain regulation well into discontinuous mode. Load

compensation circuitry allows for improved load regula-

tion. An externally activated shutdown mode reduces total

supply current to 20 A typical for standby operation.

MBRS130LT3

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

1424-5 is a monolithic high power switching

100 F

10V

330pF

1424-5 TA01

1.8k

Switching Regulator

400mA

OUT

COM

Isolated Flyback

with 5V Output

4.75

5.25

5.00

Load Regulation

100

OUTPUT CURRENT (mA)

LT1424-5

200

300

1424-5 TA02

400

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