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| LM3444_15 Datasheet, PDF (8/27 Pages) Texas Instruments – AC-DC Offline LED Driver | |||
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LM3444
SNVS682D â NOVEMBER 2010 â REVISED DECEMBER 2015
7 Detailed Description
www.ti.com
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
VCC
INTERNAL
REGULATORS
LM3444
COFF
VCC UVLO
COFF
33Ã
1.276V
THERMAL
SHUTDOWN
START
SQ
R
LATCH
MOSFET
DRIVER
GATE
1M
750 mV
FILTER
PWM
I-LIM
CONTROLLER
1.27V
1k
LEADING EDGE BLANKING
125 ns
ISNS
PGND
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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