LM3444

VCC UVLO

S

R

Q

PWM

I-LIM

1.27V

ISNS

COFF

MOSFET

DRIVER

PGND

GATE

FILTER

VCC

1.276V

THERMAL

SHUTDOWN

1M

1k

INTERNAL

REGULATORS

750 mV

33

Ö

125 ns

LEADING EDGE BLANKING

COFF

LATCH

CONTROLLER

START

LM3444

SNVS682D – NOVEMBER 2010 – REVISED DECEMBER 2015

www.ti.com

7 Detailed Description

7.1 Overview

The LM3444 device contains all the necessary circuitry to build a line-powered (mains powered) constant current

LED driver.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Theory of Operation

For an image of the LM3444 along with basic external circuitry, see Figure 8.

8

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