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LM3401EVAL: 340mA @ 13.5V Max, 4.5 ~ 35V in

Summary

The LM3401 is a switching buck regulator derived current source designed to drive a series string of high power, high brightness LEDs. The LM3401 controls an external P-FET, allowing the user to select a power device for the desired level of forward LED current. The LM3401 demo board can supply continuous current as high as 1.0A from an input voltage range of 4.5V to 35V. It is designed to operate at ambient temperatures up to 75°C.

The LM3401 maintains constant current through any number of series-connected LEDs as long as the input voltage is greater than the combined forward voltage of the LED string.

The LM3401 demo board includes an input terminal for a digital dimming signal, which is compatible with PWM dimming frequencies up to 10 kHz.

Specifications

Manufacturer	Texas Instruments
Category	Lighting
Sub-Category	LED Drivers - DC In
Eval Board Part Number	LM3401EVAL/NOPB-ND
Eval Board Supplier	Texas Instruments
Eval Board	Normally In Stock
Voltage In	4.5 ~ 35 V
Topology	Step Down
Current Out	340 mA Up to 1 A
Voltage Out (Max)	13.5 V
Outputs and Type	1 Non-Isolated
Efficiency @ Conditions	>92%, 12 ~ 14.5V in, 3 LEDs @ 350 mA >90%, 7 ~ 10V in, 2 LEDs @ 350 mA >90%, 17 ~ 33V in, 2 LEDs @ 700 mA >80%, 4.5 ~ 22V in, LED @ 1 A
Features	Current Limit (Adj. or Fixed) No Output Capacitors Open Circuit Protection Over Current Protection Short Circuit Protection Under Voltage Protection, Brown-Out
Switching Frequency	230 ~ 845 kHz
Component Count + Extras	9 + 6
Design Author	Texas Instruments
Application / Target Market
Main I.C. Base Part	LM3401
Date Created By Author
Date Added To Library	2012-02