The LM3421 and LM3423 family of devices are versatile high voltage N-channel MOSFET controllers for LED drivers. They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75 V, makes the these controllers ideal for illuminating LEDs in a large family of applications.
Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3421 and LM3423 devices use predictive off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.
The LM3421 and LM3423 devices include a high-voltage start-up regulator that operates over a wide input range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching frequencies of up to 2 MHz, thus enabling compact solutions.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM342x N -Channel Controllers for Constant-Current LED Drivers datasheet (Rev. G) | PDF | HTML | 30 Jul 2019 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Technical article | Driving LEDs: topology matters | PDF | HTML | 26 Feb 2016 | |
| Application note | AN-1656 Design Challenges of Switching LED Drivers (Rev. A) | 03 May 2013 | ||
| EVM User's guide | AN-2010 LM3423 Buck-Boost 2 Layer Evaluation Board (Rev. C) | 03 May 2013 | ||
| EVM User's guide | AN-2011 LM3423 Boost 2 Layer Evaluation Board (Rev. A) | 03 May 2013 | ||
| EVM User's guide | AN-1872 LM3423 Boost Evaluation Board (Rev. B) | 01 May 2013 | ||
| EVM User's guide | AN-1907 LM3423 Buck-Boost Configuration Evaluation Board (Rev. A) | 01 May 2013 | ||
| Application note | AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) | 23 Apr 2013 | ||
| User guide | Ambient Light Adaptive LED Driver User Guide | 27 Jan 2012 |
For additional terms or required resources, click any title below to view the detail page where available.
This wide range evaluation board showcases the LM3423 NFET controller used with a buck-boost current regulator. It is designed to drive 4 to 8 LEDs at a maximum average LED current of 700 mA from a DC input voltage of 10 to 70V.
The evaluation board showcases most features of the LM3423 including (...)
This evaluation board showcases the LM3423 NFET controller used with a boost current regulator. It is designed to drive 9 to 12 LEDs at a maximum average LED current of 700mA from a DC input voltage of 10 to 26V. The evaluation board showcases most features of the LM3423 including PWM dimming, (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
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