LT3575 Просмотр технического описания (PDF) - Linear Technology

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LT3575

Isolated Flyback Converter without an Opto-Coupler

Linear Technology 

LT3575

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

IREF Reference Current

Error Amplifier Voltage Gain

Error Amplifier Transconductance

Minimum Switching Frequency

TC Current into RREF

BIAS Pin Voltage

CONDITIONS

Measured at RFB Pin with RREF = 6.49k

VIN = 3V

ΔI = 10μA, VIN = 3V

VC = 0.35V

RTC = 20.1k

IBIAS = 30mA

MIN TYP MAX UNITS

190

μA

150

V/V

150

μmhos

40

kHz

27.5

μA

2.9

3

3.1

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 LT3575E 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

LT3575I 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

3575 G01

Quiescent Current

8

7

VIN = 40V WITH BIAS = 20V

6

5

4

VIN = 5V WITH BIAS = 5V

3

2

1

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3575 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

3575 G03

3575f

3

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