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National offers a diverse portfolio of constant-current regulators for driving high power LEDs that feature:
- PowerWise® energy-efficient solutions
- Cutting-edge features including dimming, thermal management, fault protection, and more
- Low external component count and small solution sizes
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- Easy to use tools and resources:
- Easier and more efficient for architectural, outdoor, automotive lighting applications and more
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New LM3466 Smart Linear LED Driver for Multi-Channel LED Systems
The LM3466 is a highly-integrated LED driver with dynamic current equalization and balances current through multiple LED strings. Designing an efficient, current balanced, and robust multi-string lighting system has never been easier than with the LM3466. A multi-string LED array can be built in minutes using an off-the-shelf constant current AC/DC power supply, just one LM3466, and a few passive components per string.
Maintaining equal currents among LED strings requires a complex design and multiple components. The LM3466 solves these problems by utilizing a unique dynamic current equalizing control scheme. Each LM3466, connected by a simple control bus line, ensures that the current through each active LED string is automatically equalized regardless of the number of strings or the forward voltage of each string.
LM3466 Key Features
- Easy to use
- Works with a constant current power supply with no feedback necessary
- Requires only a few external components
- Automatically equalizes the current through every active LED string
- Provides robust fault protection and reporting
- Maintains near constant output brightness if a string opens (inactive) by re-equalizing the current through the remaining active LED strings
- Delivers thermal and under-voltage protection
- Offers fault status output
- Operates with minimum voltage overhead to maximize power efficiency (up to 99%)
- Linear circuitry does not deteriorate system EMI
- Supports operating voltages from 6V to 70V
- Supports LED currents up to 1.5A
- LM3466 product folder
- LM3466 demo video
HB LED Driver Selection Chart
High Brightness LED Driver Current vs. Output Voltage
(Click box for product folder or view all in parametric table)
Regardless of type, size, or power, all LEDs work best when driven with a constant current since LED color changes with small variations to driving current. LEDs often support varying system voltages and forward voltages, which can further cause variations in LED brightness and color. National's LED drivers provide the benefit of constant current to single LEDs or arrays of LEDs, enabling color and brightness matching over a wide temperature range.
High-brightness LEDs can require more than 1W of power, making thermal management and drive circuitry an important design consideration. Improper thermal management can significantly degrade the lifetime and performance of the LEDs. Along with temperature sensors, National Semiconductor's LED drivers offer thermal protection and management to improve the performance of the LEDs in a variety of applications. |
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LM3466 Multi-String LED Current Equalization Demo
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