Product category:
Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LM3401 and LM3405A LED driver
Edited by the Electronicstalk Editorial
Team on 01 November 2007
LED drivers provide stable colours
The LM3401 is a high-efficiency hysteretic PFET switching controller that provides a high-performance, constant current drive to a string of LEDs, resulting in a constant colour output.
National Semiconductor has added two new light-emitting diode (LED) drivers to its PowerWise range National's LM3401 and LM3405A LED drivers power 1 to 5W, high-brightness LEDs found in industrial and automotive applications as well as general illumination applications such as solid state and signage Each offers a wide input voltage range and provides a constant current to regulate the LED brightness and low feedback voltage to minimise power dissipation
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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The M3401 LED driver has a voltage range of 4.5 to 35V and includes a scalable current drive of greater than 3A and a 100% duty cycle.
A low-feedback voltage of 0.2V and accuracy within 3% provides a constant current to provide constant colour output from an LED.
The LM3405A LED driver features a voltage range of 3 to 22V and can regulate from a loosely coupled 12V AC rail found in industrial and commercial lighting applications.
The LM3401 is a high-efficiency hysteretic PFET switching controller that provides a high-performance, constant current drive to a string of LEDs, resulting in a constant colour output.
An adjustable hysteretic window allows for flexibility in component selection and overall design simplicity.
No external compensation is required.
The regulated LED current is sensed and is compared to the reduced feedback of 0.2V for current sensing which eliminates the need for an output capacitor.
Offered in an eight-pin mini SOIC package, the LM3401 has programmable over current voltage protection and a DIM input pin for PWM inputs to control dimming.
Offered in a tiny 6-pin SOT-23 package, the LM3405A constant-current buck regulator delivers up to 1A of current to drive 3 or 5W LEDs.
With a 0.2V reference voltage for constant-current feedback control, internal compensation and a fixed 1.6MHz switching frequency, the LM3405A provides a simple, highly-efficient solution for driving LEDs.
It also includes an EN/DIM pin for pulse-width-modulation (PWM) dimming.
It drives general illumination for industrial and commercial lighting applications from the 12V AC and 12V DC rail.
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