LM3445-230VFLBK: 7.2W, 210 ~ 500mA @ 27V Max, 230V, TRIAC


This demonstration board highlights the performance of a LM3445 based Flyback LED driver solution that can be used to power a single LED string consisting of 4 to 10 series connected LEDs from an 180 VRMS to 265 VRMS, 50 Hz input power supply. The key performance characteristics under typical operating conditions are summarized in this application note.

This is a four-layer board using the bottom and top layer for component placement. The demonstration board can be modified to adjust the LED forward current, the number of series connected LEDs that are driven and the switching frequency. Refer to the LM3445 datasheet for detailed instructions.

Key Features:

  • Drop-in compatibility with TRIAC dimmers

  • Line injection circuitry enables PFC values greater than 0.94

  • Adjustable LED current and switching frequency

  • Flicker free operation


Manufacturer Texas Instruments
Category Lighting
Sub-Category LED Drivers - AC / Offline
Eval Board Part Number LM3445-230VFLBK/NOPB-ND
Eval Board Supplier Texas Instruments
Eval Board Board not Stocked
AC Voltage 230 V
Outputs and Type 1 Isolated
Current Out 210 mA
275 mA
350 mA
500 mA
Voltage Out (Max) 27 V
Efficiency @ Conditions >82%, 230V in, 8 LEDs @ 270 mA
>82%, 230V in, 10 LEDs @ 220 mA
>81%, 230V in, 6 LEDs @ 350 mA
>79%, 230V in, 4 LEDs @ 490 mA
Features Current Limit (Adj. or Fixed)
Dimming Control
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 67 kHz
Component Count + Extras 70 + 16
Design Author Texas Instruments
Application / Target Market Lighting: LED Home Lighting
Voltage In 180 ~ 265 VAC
Power Factor
Main I.C. Base Part LM3445
Date Created By Author 2010-11
Date Added To Library 2012-07