LT8302HS8E-3-WPBF Просмотр технического описания (PDF) - Analog Devices

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LT8302HS8E-3-WPBF

42VIN Micropower No-Opto Isolated Flyback Converter with 65V/3.6A Switch

Analog Devices 

FEATURES

n 3V to 42V Input Voltage Range

n 3.6A, 65V Internal DMOS Power Switch

n Low Quiescent Current:

n 106µA in Sleep Mode

n 380µA in Active Mode

n Quasi-Resonant Boundary Mode Operation at

Heavy Load

n Low Ripple Burst Mode® Operation at Light Load

n Minimum Load < 0.5% (Typ) of Full Output

n No Transformer Third Winding or Opto-Isolator

Required for Output Voltage Regulation

n Accurate EN/UVLO Threshold and Hysteresis

n Internal Compensation and Soft-Start

n Temperature Compensation for Output Diode

n Output Short-Circuit Protection

n Thermally Enhanced 8-Lead SO Package

n AEC-Q100 Qualified for Automotive Applications

APPLICATIONS

n Isolated Automotive, Industrial, Medical

Power Supplies

n Isolated Auxiliary/Housekeeping Power Supplies

LT8302/LT8302-3

42VIN Micropower No-Opto

Isolated Flyback Converter

with 65V/3.6A Switch

DESCRIPTION

The LT®8302/LT8302-3 is a monolithic micropower iso-

lated flyback converter. By sampling the isolated output

voltage directly from the primary-side flyback waveform,

the part requires no third winding or opto-isolator for

regulation. The output voltage is programmed with two

external resistors and a third optional temperature com-

pensation resistor. Boundary mode operation provides a

small magnetic solution with excellent load regulation.

Low ripple Burst Mode operation maintains high efficiency

at light load while minimizing the output voltage ripple. A

3.6A, 65V DMOS power switch is integrated along with all

the high voltage circuitry and control logic into a thermally

enhanced 8-lead SO package.

The LT8302/LT8302-3 operates from an input voltage

range of 3V to 42V and delivers up to 18W of isolated

output power. The high level of integration and the use of

boundary and low ripple burst modes result in a simple to

use, low component count, and high efficiency application

solution for isolated power delivery.

All registered trademarks and trademarks are the property of their respective owners. Protected

by U.S. patents, including 5438499, 7463497, 7471522.

TYPICAL APPLICATION

3V to 32VIN/5VOUT Isolated Flyback Converter

VIN

3V TO 32V

10µF

VIN

EN/UVLO SW

LT8302/LT8302-3

GND

RFB

INTVCC

1µF

RREF

TC

3:1

470pF

•

9µH

1µH

39Ω

•

VOUT+

5V

220µF

VOUT–

154k

115k 10k

10mA TO 1.1A (VIN = 5V)

10mA TO 2.0A (VIN = 12V)

10mA TO 2.9A (VIN = 24V)

8302 TA01a

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For more information www.analog.com

Efficiency vs Load Current

90

85

80

75

70

65

VIN = 5V

VIN = 12V

VIN = 24V

60

0 0.5 1.0 1.5 2.0 2.5 3.0

LOAD CURRENT (A)

8302 TA01b

Rev. G

1

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