LT3799IMSE-1(RevA) 查看數據表（PDF） - Linear Technology

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LT3799IMSE-1
(Rev.:RevA)

Offline Isolated Flyback LED Controller with Active PFC

Linear Technology 

LT3799-1

Offline Isolated Flyback

LED Controller with Active PFC

Features

nn Isolated PFC LED Driver with Minimum Number of

External Components

nn VIN and VOUT Limited Only by External Components

nn Active Power Factor Correction (Typical PFC > 0.97)

nn Low Harmonic Content

nn No Opto-Coupler Required

nn Accurate Regulated LED Current (±5% Typical)

nn Open LED and Shorted LED Protection

nn Thermally Enhanced 16-Lead MSOP Package

Applications

nn Offline 4W to 100W+ LED Applications

nn High DC VIN LED Applications

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Patents pending.

Description

The LT®3799-1 is an isolated flyback controller with power

factor correction specifically designed for driving LEDs.

The controller operates using critical conduction mode

allowing the use of a small transformer. Using a novel

current sensing scheme, the controller is able to deliver a

well regulated current to the secondary side without using

an opto-coupler. A strong gate driver is included to drive

an external high voltage MOSFET. Utilizing an onboard

multiplier, the LT3799-1 typically achieves power factors

of 0.97. The FAULT pin provides notification of open and

short LED conditions. The LT3799-1 offers improved line

regulation over the LT3799, but is not designed for use

with a TRIAC dimmer.

The LT3799-1 uses a micropower hysteretic start-up to

efficiently operate at offline input voltages, with a third

winding to provide power to the part. An internal LDO

provides a well regulated supply for the part’s internal

circuitry and gate driver.

Typical Application

20W LED Driver

90V

TO 150V

AC

100k

FAULT

100k

0.22µF 499k 100k

499k

20Ω

4.7pF

10µF

2k

4:1:1

6.34k

VIN

VIN_SENSE

LT3799-1

DCM

FB

32.4k 40.2k

100k

NTC 15.8k

VREF

CTRL3

CTRL2

CTRL1

GATE

SENSE

INTVCC

GND

FAULT CT COMP+ COMP–

0.1µF

0.1µF

100k

4.99k

170V

20Ω

560µF

×2

4.7µF

0.05Ω

2.2nF

1A

20W

33V

LED

POWER

LED Current vs Input Voltage

1.20

1.15

1.10

1.05

1.00

0.95

0.90

0.85

0.80

90 100 110 120 130 140 150

VIN (VAC)

37991 TA01b

37991 TA01a

For more information www.linear.com/LT3799-1

37991fa

1

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