LT1737IS(RevA) Просмотр технического описания (PDF) - Linear Technology

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LT1737IS
(Rev.:RevA)

High Power Isolated Flyback Controller

Linear Technology 

LT1737

ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC = 14V, GATE open, VC = 1.4V unless otherwise noted.

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

Current Amplifier

VC

Control Pin Threshold

Duty Cycle = Min

0.90

1.12

1.25

● 0.80

1.35

VISENSE

Switch Current Limit

Duty Cycle ≤ 30%

Duty Cycle ≤ 30%

Duty Cycle = 80%

220

250

270

● 200

280

220

∆VISENSE/∆VC

0.30

Timing

f

Switching Frequency

COSCAP = 100pF

90

● 80

100

115

125

COSCAP

tON

tED

tEN

Rt

Oscillator Capacitor Value

Minimum Switch On Time

Flyback Enable Delay Time

Minimum Flyback Enable Time

Timing Resistor Value

Maximum Switch Duty Cycle

(Note 2)

RtON = 50k

RENDLY = 50k

RMENAB = 50k

(Note 2)

33

24

● 85

200

200

200

200

240

90

Load Compensation

Sense Offset Voltage

2

5

Current Gain Factor

0.80

0.95

1.05

UVLO Function

VUVLO

UVLO Pin Lockout Threshold

UVLO Pin Shutdown Threshold

● 1.21

1.25

1.29

● 0.4

0.75

0.95

IUVLO

UVLO Pin Bias Current

3V Output Function

VUVLO = 1.2V

VUVLO = 1.3V

– 0.25

+ 0.1

+ 0.25

– 4.50

– 3.5

– 2.50

VREF

Reference Output Voltage

Output Impedance

ILOAD = 1mA

● 2.8

3.0

3.2

10

Current Limit

●8

15

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

a device may be impaired.

Note 2: Component value range guaranteed by design.

UNITS

V

V

mV

mV

mV

mV

kHz

kHz

pF

ns

ns

ns

kΩ

%

mV

mV

V

V

V

µA

µA

V

Ω

mA

1737fa

3

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