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 PFC 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 | |
| Standard(s) | |
| Main I.C. Base Part |
LM3445
|
| Date Created By Author | 2010-11 |
| Date Added To Library | 2012-07 |
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