The LM3405A demo board is configured to drive a series string of high power, high brightness LEDs at a forward current of 1A using the LM3405A constant current buck regulator. The board can accept a full input operating range of 3V to 22V. The converter output voltage adjusts as needed to maintain a constant current through the LED array. The LM3405A 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 5 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).
Applications:
| Type | Title | Date | ||
|---|---|---|---|---|
| * | User guide | AN-1685 LM3405A Demo Board (Rev. B) | 01 May 2013 | |
| Certificate | LM3405AEVAL/NOPB EU Declaration of Conformity (DoC) | 02 Jan 2019 | ||
| Application note | Powering & Dimming High-Brightness LEDs w/ LM3405 Constant-Current Buck Reg (Rev. A) | 01 May 2013 | ||
| User guide | LM3405A Reference Design for MR16 LED Bulb, 600mA User Guide | 27 Jan 2012 |
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