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LED Drivers for LED Bulb & Downlights

Product ID	Isolation	Dimming	Integrated Active PFC	Fixtures
LM3401				MR16
LM3444				A-Lamp, R/PAR/BR, Downlight
LM3445				A-Lamp, R/PAR/BR, Downlight
LM3448				A-Lamp
TPS92070				A-Lamp
LM3450				Downlight

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LM3445 TRIAC Dimmable LED Driver

The industry-leading LM3445 TRIAC dimmable offline LED driver solution is perfect for any application where an LED driver must interface to a standard TRIAC wall dimmer. TI's TRIAC dimmable LED driver delivers a wide, uniform dimming range free of flicker, best-in-class dimming performance, and high efficiency—all while maintaining ENERGY STAR® power factor requirements in a typical application.

Conventional TRIAC dimmers are designed to interface to a resistive load (halogen or incandescent bulb), while today's LED driver solutions interfaced to a standard wall dimmer produce 120 Hz flicker of the LED and/or do not allow 100:1 dimming. TI's LM3445 LED driver decodes the TRIAC chopped waveform and translates the signal to dim the LEDs to achieve a full, wide dimming range, without flicker.

LM3445 Key Features:

• Application voltage range from 80 VAC to 270 VAC
• Angle detector/decoder enables wide (100:1) full range dimming
• Integrated 300Ω bleeder resistor to ensure proper TRIAC signal decoding
• Patent-Pending control architecture allows for constant ripple current which extends the life of the LEDs
• Scalable output current up to and greater than 1A
• Master/Slave control for uniform dimming across multi-channel applications
• Ideal dimming solution for PAR20, PAR25, PAR30, PAR38, A-Lamp, and downlight LED bulbs
• See also LM3448 with integrated, vertical 600V MOSFET with superior avalanche energy capability

Easy To Use

The LM3445 LED driver enables a direct replacement of incandescent or halogen lamp systems that are currently interfaced to a TRIAC dimmer without having to change the original infrastructure or sacrifice performance. In addition, the LM3445 and other switching controller (switcher) constant-current LED drivers are available in WEBENCH® LED Architect to allow for easy and quick design in.

Full Range Dimming Capability

The LM3445 LED driver offers 100:1 full range dimming capability, going from full light to nearly imperceptible light in a continuous range without being extinguished, and maintains a constant current to large strings of LEDs driven in series off of a standard line voltage.

Uniform Dimming Without Flicker

The LM3445 LED driver allows master-slave operation control in multi-chip solutions which enables a single TRIAC dimmer to control multiple strings of LEDs with smooth consistent dimming, free of flicker.

LM3445 TRIAC Dimmable LED Driver Design Resources

• LM3445 Product Folder
• LM3445 Reference Designs
  • A-Lamp (Edison A19, A21, A15, etc.)
  • P/PAR/BR Lamps (R20, PAR20, PAR30, PAR38, BR30, BR40, etc.)
  • Downlight Fixtures
• LM3445 Eval Boards
• Power Designer #126 - Dimming Techniques for Switched-Mode LED Drivers (article)

LM3445 Videos

Learn more about Triac Dimming and LM3445 LED Driver

Watch the Arrow Electronics evaluation of the LM3445

LM3450 Phase Dimmable LED Driver

TI's LM3450 phase dimmable LED driver integrates active power factor correction and phase dimming decoding, and is ideal for dimmable LED fixture applications with output powers between 10W and 100W and accepts universal input voltages. The LM3450 features unique dynamic hold circuitry, ensuring excellent dimming performance and an analog adjust pin to allow for differentiated features such as thermal foldback, interface to sensors, or dimmer range adjust.

LM3450 Key Features:

• Active power factor correction IC with phase dimmer decoder
• Unique dynamic hold circuitry for high performance, smooth, linear dimming without flicker
• 70:1 PWM decoded from phase dimmer
• Up to 100W output power
• Programmable dimming range
• Analog adjust pin allows for interface to sensors, thermal foldback, analog dimming, or dimmer range adjust
• TSSOP-16 package
• Over-voltage protection
• Feedback short circuit protection
• Compatible with both forward phase (TRIAC) and reverse phase dimmers
• Target Applications: Dimmable LED fixtures, 10W-100W output power
• LM3450 120VAC & 230VAC evaluation boards
• LM3450 downlight reference designs

AC/DC LED Driver Design Software

AC/DC LED Driver App Notes

• Efficient Method for Interfacing TRIAC Dimmers and LEDs (article)
• High LED Drive Currents with Low Stack Voltages Create Efficiency Challenges (article)