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LM3445MX Datasheet(PDF) 7 Page - Texas Instruments |
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LM3445MX Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 39 page  BRIGHT DIM MAINS AC R1 250 kÖ DIAC LOAD R2 3.3 kÖ C1 100 nF TRIAC LM3445 7.2V VCC UVLO S R Q 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 1k RAMP GEN. 5.9 kHz 3V 1V 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 Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM3445 |
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