LT3837EFE-TRPBF datasheet(3/28 Pages) LINER

部件名	LT3837EFE-TRPBF

功能描述	Isolated No-Opto Synchronous Flyback Controller

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制造商	LINER [Linear Technology]

网页	http://www.linear.com

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LT3837

3

3837fa

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: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the speciﬁed maximum operating junction

temperature may impair device reliability.

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

temperature range, otherwise speciﬁcations are TA = 25°C. VCC = 14V; PG, SG Open; VC = 1.4V, VSENSE = 0, RCMP = 1k, RTON = 90k,

RPGDLY = 27.4k, RENDLY = 90k, unless otherwise speciﬁed.

Note 3: The LT3837E is guaranteed to meet performance speciﬁcations

from 0°C to 85°C. Speciﬁcations over the –40°C to 125°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls.

Note 4: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD • 40°C/W)

Note 5: Supply current does not include gate charge current to the

MOSFETs. See Applications Information.

Note 6: Component value range guaranteed by design.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Feedback Ampliﬁer Voltage Gain

VC = 1V to 2V

1400

V/V

Soft-Start Charging Current

VSFST = 1.5V

16

20

25

μA

Soft-Start Discharge Current

VSFST = 1.5V, VUVLO = 0V

0.7

1.3

mA

Control Pin Threshold (VC)

Duty Cycle = Min

1.0

V

Gate Outputs

PG, SG Output High Level

PG, SG Output Low Level

l

6.6

7.4

0.01

8.0

0.05

V

PG, SG Output Shutdown Strength

VUVLO = 0V; IPG, ISG = 20mA

l

1.6

2.3

V

PG Rise Time

CPG = 1nF

11

ns

SG Rise Time

CSG = 1nF

15

ns

PG, SG Fall Time

CPG, CSG = 1nF

10

ns

Current Ampliﬁer

Switch Current Limit at Maximum VC

VSENSE +

l

88

98

110

mV

ΔVSENSE/ΔVC

0.07

V/V

Sense Voltage Overcurrent Fault Voltage

VSENSE +, VSFST < 1V

206

230

mV

Timing

Switching Frequency (fOSC)COSC = 100pF

l

84

100

110

kHz

Oscillator Capacitor Value (COSC)

(Note 6)

33

200

pF

Minimum Switch On Time (tON(MIN))

200

ns

Flyback Enable Delay Time (tED)

265

ns

PG Turn-On Delay Time (tPGDLY)

200

ns

Maximum Switch Duty Cycle

l

85

88

%

SYNC Pin Threshold

l

1.53

2.1

V

SYNC Pin Input Resistance

40

k

Ω

Load Compensation

Load Comp to VSENSE Offset Voltage

VRCMP with VSENSE+ = 0

0.8

mV

Feedback Pin Load Compensation Current

VSENSE+ = 20mV

20

μA

UVLO Function

UVLO Pin Threshold (VUVLO)

l

1.215

1.240

1.265

V

UVLO Pin Bias Current

VUVLO = 1.2V

VUVLO = 1.3V

–0.25

–4.50

0.1

–3.4

0.25

–2.50

μA

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