The LM3405 demo board is configured to drive a series string of high power, high brightness LEDs at a forward current of 1A using the LM3405 constant current buck regulator. The board can accept a full input operating range of 3V to 15V.
The converter output voltage adjusts as needed to maintain a constant current through the LED array. The LM3405 is a step-down regulator with an output voltage range extending from a Vo(MIN) of 205mV (the reference voltage) to a Vo(MAX) determined by the maximum duty cycle (typically 94%). It can drive up to 3 LEDs in series at 1A forward current, with the single LED forward voltage of approximately 3.7V (Typical of white, blue, and green LEDs using InGaN technology).
| Manufacturer | Texas Instruments |
|---|---|
| Category | Lighting |
| Sub-Category | LED Drivers - DC In |
| Eval Board Part Number | LM3405XEVAL/NOPB-ND |
| Eval Board Supplier | Texas Instruments |
| Eval Board |
Normally In Stock
|
| Voltage In |
3 ~ 15 V
|
| Topology |
Step Down
|
| Current Out |
1 A
|
| Voltage Out (Max) |
13.5 V
|
| Outputs and Type |
1 Non-Isolated
|
| Efficiency @ Conditions |
>83%, 7.5 ~ 15V in, 7V @ 1 A
|
| Features |
Dimming Control
Over Current Protection Shutdown, Enable, Standby Thermal Protection Under Voltage Protection, Brown-Out |
| Switching Frequency |
1.6 MHz
|
| Component Count + Extras |
13 + 3
|
| Design Author |
Texas Instruments
|
| Application / Target Market |
Automotive
Flashlight / Torch |
| Main I.C. Base Part |
LM3405
|
| Date Created By Author | |
| Date Added To Library | 2011-03 |
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