LT8301MP 查看數據表（PDF） - Analog Devices

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LT8301MP

42VIN Micropower No-Opto Isolated Flyback Converter with 65V/1.2A Switch

Analog Devices 

FEATURES

n 2.7V to 42V Input Voltage Range

n 1.2A, 65V Internal DMOS Power Switch

n Low Quiescent Current:

n 100µA in Sleep Mode

n 350µA in Active Mode

n 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 VOUT Set with a Single External Resistor

n No Transformer Third Winding or Opto-Isolator

Required for Regulation

n Accurate EN/UVLO Threshold and Hysteresis

n Internal Compensation and Soft-Start

n Output Short-Circuit Protection

n 5-Lead TSOT-23 Package

n AEC-Q100 Qualified for Automotive Applications

APPLICATIONS

n Isolated Telecom, Automotive, Industrial, Medical

Power Supplies

n Isolated Auxiliary/Housekeeping Power Supplies

LT8301

42VIN Micropower No-Opto

Isolated Flyback Converter

with 65V/1.2A Switch

DESCRIPTION

The LT®8301 is a micropower isolated 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 a single external resistor. Internal

compensation and soft-start further reduce external com-

ponent count. 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

1.2A, 65V DMOS power switch is integrated along with

all high voltage circuitry and control logic into a 5-lead

ThinSOT™ package.

The LT8301 operates from an input voltage range of 2.7V

to 42V and can deliver up to 6W 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, and 7471522.

TYPICAL APPLICATION

VIN

2.7V TO 36V

2.7V to 36VIN/5VOUT Micropower Isolated Flyback Converter

10µF

VIN

EN/UVLO

SW

LT8301

RFB

GND

3:1

•

40µH

4.4µH

•

154k

VOUT+

5V

6mA TO 0.40A (VIN = 5V)

100µF

6mA

6mA

TO

TO

0.70A

1.00A

(VIN

(VIN

=

=

12V)

24V)

6mA TO 1.15A (VIN = 36V)

8301 TA01a VOUT–

Efficiency vs Load Current

90

85

80

75

70

VIN = 5V

65

VIN = 12V

VIN = 24V

VIN = 36V

60

0 0.2 0.4 0.6 0.8 1.0 1.2

LOAD CURRENT (A)

8301 TA01b

Rev. B

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For more information www.analog.com

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