Product category: Power Supply ICs and Controllers
News Release from: National Semiconductor | Subject: LM3402, LM3404 and LM3405
Edited by the Electronicstalk Editorial Team on 19 October 2006
LED drivers offer wider input voltage
ranges
A new family of light-emitting diode drivers are designed to power the new generation of 1 to 5W, high-brightness LEDs found in automotive, industrial and general illumination applications.
A new family of light-emitting diode (LED) drivers are designed to power the new generation of 1 to 5W, high-brightness LEDs found in automotive, industrial and general illumination applications National's LM3402, LM3404 and LM3405 LED drivers offer the wider input voltage range required by this fast-growing market segment
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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In addition, National's new LED drivers provide a constant current to regulate the LED brightness and low feedback voltage to minimise power dissipation.
"National already offers a wide portfolio of LED drivers designed for low-power portable applications such as those in cellphones and PDAs", said Mal Humphrey, Product Line Director for the Power Management Group at National Semiconductor.
"This new family of products extends that portfolio, using our higher voltage and current capabilities to address the high-brightness LED market as well".
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Optimised for 1W LEDs, National offers two versions of the LM3402 LED driver that provide wide input voltage ranges of either 6 to 42 or 6 to 75V.
For 3 and 5W LEDs, the LM3404 and LM3405 have additional output current drive capability.
National's new family of LED drivers will be shown at National's Booth A4.506 at Electronica in Munich from 14th to 17th November 2006.
The LM3402 is a compact, constant-current buck regulator with up to 95% efficiency that drives up to 525mA of current.
Offered in an 8-pin mini SOIC package, the LM3402 has an enable pin that also can be used for dimming via pulse-width modulation (PWM) inputs and a reduced feedback of 0.2V for current sensing.
The LM3402's input voltage ranges from 6 to 42V.
For higher input voltages, the LM3402HV offers the same features and a 6-75V voltage range.
Offered in an 8-pin SOIC narrow package, the LM3404 and LM3404HV share the same functionality as the LM3402 and LM3402HV, but have the ability to drive currents up to 1.2A.
These products are well-suited to power 3 and 5W LEDs at current levels of 700mA or 1A, respectively.
Offered in an 8-pin mini SOIC package and a tiny 6-pin SOT-23 package, the LM3405 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 and a switching frequency that is internally set to either 550kHz or 1.6MHz, the LM3405 provides a simple, highly efficient solution for driving LEDs.
In addition, the LM3405 has an input voltage range of 3 to 22V, is internally compensated and has an en/dim pin for PWM dimming.
The LM3402 and LM3402HV are available now in production quantities.
Samples of the LM3404 and LM3404HV are available now and production quantities will be available in November.
Samples of the LM3405 will be available in November and production quantities will be available in January 2007.
Prices for these LED drivers start at US $1.35 for the LM3402 and $1.65 for the LM3402HV in 1000-unit quantities.
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