LM3445-208277EV: 220mA/350mA @ 55V Max, 230V

Summary

The demonstration board included in this shipment is capable of converting a 176VAC to 305VAC input that has been phase dimmed to drive multiple LED’s at up to 500 mA average current. The evaluation board utilizing the LM3445 will automatically adjust the LED current and light output in relation to the triac firing angle.

The target solution for this design was 230VAC input driving 8 series connected white LEDs. In this configuration the LM3445 will run at a nominal switching frequency of 80 kHz and supply a maximum of 350 mA.

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 and switching frequency.

Specifications

Manufacturer Texas Instruments
Category Lighting
Sub-Category LED Drivers - AC / Offline
Eval Board Board not Stocked
AC Voltage 230 V
277 V
Outputs and Type 1 Non-Isolated
Current Out 220 mA
350 mA
Voltage Out (Max) 55 V
Efficiency @ Conditions >83%, 230V in, 16 LEDs @ 220 mA
>80%, 230V in, 8 LEDs @ 350 mA
Features Current Limit (Adj. or Fixed)
Dimming Control
PFC
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 80 kHz
Component Count + Extras 79 + 8
Design Author Texas Instruments
Application / Target Market Lighting: LED Home Lighting
Voltage In 176 ~ 305 VAC
Power Factor
Standard(s)
Main I.C. Base Part LM3445
Date Created By Author
Date Added To Library 2011-03

Support Documents & Media

LM3445 - Datasheet LM3445-208277EV - User Guide - App Note AN-1995 Ultra Librarian Software:CAD Symbols and Footprints (Zip File) TI's CAD/CAE Symbols and Footprint Search

Media

LM3445_208277EV_Schematic.JPG LM3445_208277EV_Board.jpg LM3445_208277EV_Chart.JPG