LT3574IMS Просмотр технического описания (PDF) - Linear Technology

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LT3574IMS

Isolated Flyback Converter Without an Opto-Coupler

Linear Technology 

LT3574

Electrical Characteristics The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP MAX

UNITS

Error Amplifier Transconductance

Minimum Switching Frequency

TC Current into RREF

BIAS Pin Voltage

DI = 10µA, VIN = 3V

VC = 0.35V

RTC = 20.1k

IBIAS = 30mA

150

40

27.5

2.9

3

3.1

µmhos

kHz

µA

V

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LT3574E is guaranteed to meet performance specifications

from 0°C to 125°C junction temperature. Specifications over the –40°C

to 125°C operating junction temperature range are assured by design

characterization and correlation with statistical process controls. The

LT3574I is guaranteed over the full –40°C to 125°C operating junction

temperature range.

Note 3: Current flows out of the RREF pin.

Typical Performance Characteristics TA = 25°C, unless otherwise noted.

Output Voltage

5.20

5.15

5.10

5.05

5.00

4.95

4.90

4.85

4.80

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3574 G01

Quiescent Current

6

VIN = 40V

5

BIAS = 20V

4

VIN = 5V

BIAS = 5V

3

2

1

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3574 G02

Bias Pin Voltage

3.2

VIN = 40V

3.0

VIN = 12V

2.8

2.6

2.4

2.2

2.0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3574 G03

3574f



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