LM3445M datasheet(7/39 Pages) TI

tên linh kiện	LM3445M

Giải thích chi tiết về linh kiện	Triac Dimmable Offline LED Driver

PDF	39 Pages

Scroll/Zoom	100%

nhà sản xuất	TI [Texas Instruments]

Trang chủ	http://www.ti.com

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7 / 39 page

BRIGHT

DIM

MAINS AC

250 kÖ

DIAC

LOAD

3.3 kÖ

100 nF

TRIAC

LM3445

7.2V

VCC UVLO

PWM

I-LIM

1.27V

ISNS

ASNS

COFF

MOSFET

DRIVER

GND

FLTR1

FLTR2

DIM

VCC

ANGLE DETECT

BLEEDER

DIM DECODER

1.276V

4.9V

RAMP

0V to 4V

THERMAL

SHUTDOWN

50k

370k

RAMP GEN.

5.9 kHz

INTERNAL

REGULATORS

750 mV

33:

125 ns

LEADING EDGE BLANKING

Tri-State

COFF

LATCH

CONTROLLER

START

4 Ps

BLDR

230

GATE

LM3445

www.ti.com

SNVS570L – JANUARY 2009 – REVISED MAY 2013

SIMPLIFIED INTERNAL BLOCK DIAGRAM

Figure 11. Simplified Block Diagram

APPLICATION INFORMATION

FUNCTIONAL DESCRIPTION

The LM3445 contains all the necessary circuitry to build a line-powered (mains powered) constant current LED

driver whose output current can be controlled with a conventional triac dimmer.

OVERVIEW OF PHASE CONTROL DIMMING

A basic "phase controlled" triac dimmer circuit is shown in Figure 12.

Figure 12. Basic Triac Dimmer

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