LT1425 Просмотр технического описания (PDF) - Linear Technology

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LT1425

Isolated Flyback Switching Regulator

Linear Technology 

LT1425

ELECTRICAL CHARACTERISTICS VIN = 5V, TJ = 25°C, VSW Open, VC = 1.4V, unless otherwise specified.

SYMBOL

PARAMETER

Load Compensation

∆VRCCOMP/∆ISW

SYNC Function

Minimum SYNC Amplitude

Synchronization Range

SYNC Pin Input Resistance

Power Supply

VIN(MIN)

ICC

Minimum Input Voltage

Supply Current

Shutdown Mode Supply Current

Shutdown Mode Threshold

CONDITIONS

MIN TYP MAX

0.45

q

1.5

2.2

320

450

40

q

2.8

3.1

q

7.0

9.5

q

15

40

q 0.4

0.9

1.3

UNITS

Ω

V

kHz

kΩ

V

mA

µA

V

The q denotes the specifications which apply over the full operating

temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: Feedback amplifier transconductance is RREF referred.

Note 3: Voltage gain is RREF referred.

TYPICAL PERFORMANCE CHARACTERISTICS

Switch Saturation Voltage vs

Switch Current

1.2

1.0

125°C

0.8

25°C

0.6

–55°C

0.4

0.2

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

SWITCH CURRENT (A)

1425 G01

Switch Current Limit vs

Duty Cycle

2.0

TA = 25°C

1.5

1.0

0.5

0

0 10 20 30 40 50 60 70 80 90 100

DUTY CYCLE (%)

1425 G02

Minimum Input Voltage vs

Temperature

3.1

3.0

2.9

2.8

2.7

2.6

2.5

2.4

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1425 G03

3

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