LM3409 演示板




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.

汽车 LED 驱动器
LM3409-Q1 用于高功率 LED 驱动器的 42V 汽车类 PFET 降压控制器


照明 LED 驱动器
LM3409 用于高功率 LED 驱动器的 42V PFET 降压控制器
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LM3409EVAL/NOPB — LM3409 演示板

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类型 标题 下载最新的英文版本 日期
* 用户指南 AN-1954 LM3409 Demonstration Board (Rev. D) 2013年 5月 1日
* 应用手册 Application Note 1954 LM3409 Demonstration Board (cn) 2009年 11月 20日
证书 LM3409EVAL/NOPB EU Declaration of Conformity (DoC) 2019年 1月 2日


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