LM3405XEVAL: 1A @ 13.5V Max, 3 ~ 15V in

Summary

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).

Specifications

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