LM3409EVAL

LM3409 demonstration board

LM3409EVAL

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Overview

This demonstration board showcases the LM3409 PFET controller for a buck current regulator. It is designed to drive 4 LEDs (VO = 15V) at a maximum average LED current (ILED = 1A) from a DC input voltage (VIN = 24V). The switching frequency (fSW = 525 kHz) is targeted for the nominal operating point, however fSW varies across the entire operating range. The circuit can accept an input voltage of 6V-42V. However, if the input voltage drops below the regulated LED string voltage, the converter goes into dropout and VO = VIN ideally. The demonstration board showcases several features of the LM3409 including both analog dimming using a potentiometer (R5) tied to the IADJ pin and internal PWM dimming using the EN pin. There is a header (J1) with a removable jumper, which is used to select PWM dimming or low power shutdown. The board has a right angle connector (J2) which can mate with an external LED load board allowing for the LEDs to be mounted close to the driver. This reduces potential ringing when there is no output capacitor. Alternatively, the LED+ and LED- turrets can be used to connect the LED load.

Automotive LED drivers
LM3409-Q1 42-V automotive PFET buck controller for high power LED Drives

 

Illumination LED drivers
LM3409 42-V PFET buck controller for high power LED drives

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Evaluation board

LM3409EVAL/NOPB – LM3409 Demonstration Board

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Technical documentation

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Type Title Date
* User guide AN-1954 LM3409 Demonstration Board (Rev. D) May 01, 2013
Certificate LM3409EVAL/NOPB EU Declaration of Conformity (DoC) Jan. 02, 2019

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