LM3424BKBSTEVAL: 1A @ 35V Max, 10 ~ 70V in


This wide range evaluation board showcases the LM3424 NFET controller used with a buck-boost current regulator. It is designed to drive 4 to 10 LEDs at a maximum average LED current of 1A from a DC input voltage of 10 to 70V.

The evaluation board showcases many of the LM3424 features including thermal foldback, analog dimming, external switching frequency synchronization, and high frequency PWM dimming, among others.

There are many external connection points to facilitate the full evaluation of the LM3424 device including inputs, outputs and test points. Refer to Table 1 in the user guide for a summary of the connectors and test points.

The buck-boost circuit can be easily redesigned for different specifications by changing only a few components (see the Alternate Designs section). Note that design modifications can change the system efficiency for better or worse.

This application note is designed to be used in conjunction with the LM3424 datasheet as a reference for the LM3424 buck-boost evaluation board. Refer to the LM3424 Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs (SNVS603) data sheet for a comprehensive explanation of the device, design procedures, and application information.


Manufacturer Texas Instruments
Category Lighting
Sub-Category LED Drivers - DC In
Eval Board Part Number LM3424BKBSTEVAL/NOPB-ND
Eval Board Supplier Texas Instruments
Eval Board Normally In Stock
Voltage In 10 ~ 70 V
Topology Step Up/Down
Current Out 1 A
Voltage Out (Max) 35 V
Outputs and Type 1 Non-Isolated
Efficiency @ Conditions >85%, 10 ~ 70 Vin, (9) Series LEDs @ 1A
Features Dimming Control
Over Voltage Protection
Under Voltage Protection, Brown-Out
Switching Frequency 500 kHz
Component Count + Extras 56 + 15
Design Author Texas Instruments
Application / Target Market Automotive
LED Commercial Lighting
LED Home Lighting
LED Street Lighting
Main I.C. Base Part LM3424
Date Created By Author 2009-08
Date Added To Library 2019-05

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