Datasheet > 750813134

750813134

更新时间： 2022-04-02 16:02:35

品牌	Logo	应用领域
凌特 - Linear		功率因数校正控制器
页数	文件大小	规格书
20页	1764K
描述
Offline Isolated Flyback LED Controller with Active PFC

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750813134 数据手册

Electrical Specifications Subject to Change

LT3799

Offline Isolated Flyback

LED Controller with Active PFC

FEATURES

DESCRIPTION

ꢀhe Lꢀ^®3799 is an isolated flyback controller with power

factor correction specifically designed for driving LEDs.

ꢀhe 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 MOSFEꢀ. Utilizing an onboard

multiplier, the Lꢀ3799 typically achieves power factors

of 0.97. ꢀhe FAULT pin provides notification of open and

short LED conditions.

Isolated PFC LED Driver with Minimum Number of

External Components

TRIAC Dimmable

V and V

Limited Only by External Components

OUT

Active Power Factor Correction (Typical PFC > 0.97)

Low Harmonic Content

No Opto-Coupler Required

Accurate Regulated LED Current (±±5 ꢀypical)

Open LED and Shorted LED Protection

ꢀhermally Enhanced 16-lead MSOP Package

APPLICATIONS

ꢀhe Lꢀ3799 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.

Offline 4W to 100W+ LED Applications

High DC V LED Applications

L, Lꢀ, LꢀC, LꢀM, Linear ꢀechnology and the Linear logo are registered trademarks and

ꢀrue Color PWM is a trademark of Linear ꢀechnology Corporation. All other trademarks are the

property of their respective owners. Patents pending.

TYPICAL APPLICATION

TRIAC Dimmable 20W LED Driver

LED Current vs Input Voltage

1.20

1.15

100k

90V

TO 150V

20Ω

0.22µF

200Ω

4:1:1

1.10

0.1µF

499k

4.7pF

1.05

1.00

10µF

DCM

100k

0.95

IN_SENSE

0.90

4.99k

560µF

× 2

LT3799

6.34k

40.2k

0.85

0.80

REF

20W

20Ω

100

110

120

130

140

150

LED

100k

32.4k

CTRL3

CTRL2

CTRL1

GATE

)

IN AC

POWER

3799 TA01b

SENSE

INTVCC

0.05Ω

100k

NTC

4.7µF

16.2k

2.2nF

GND

–

FAULT

FAULT CT COMP COMP

3799 TA01a

0.1µF

3799p

12 3 4 5 6 7...20

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