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LM3424BSTEVAL/NOPB 产品设计参考手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
开发套件
描述:
LM3424 升压评估板此评估板展示了 LM3424 NFET 控制器，可与升压电流调节器一起使用，带热量返送 设计用于在 1A 的最大平均 LED 电流下驱动 9 到 12 个 LED，具有 10 到 26V 输入范围 LM3424 功能包括热量返送、模拟调光、外部切换频率同步和高频 PWM 调光等 ### LED 驱动器，Texas Instruments
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LM3424BSTEVAL/NOPB数据手册
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V
IN
(V)
EFFICIENCY (%)
100
95
90
85
80
10 15 20 25 30
User's Guide
SNVA398A–August 2009–Revised May 2013
AN-1969 LM3424 Boost Evaluation Board
1 Introduction
This evaluation board showcases the LM3424 NFET controller used with a boost current regulator. It is
designed to drive 9 to 12 LEDs at a maximum average LED current of 1A from a DC input voltage of 10 to
26V.
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 for a summary of the connectors and test points.
The boost circuit can be easily redesigned for different specifications by changing only a few components
(see Alternate Designs). 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 Constant Current N-Channel
Controller with Thermal Foldback for Driving LEDs (SNVS603) data sheet as a reference for the LM3424
boost evaluation board and for a comprehensive explanation of the device, design procedures, and
application information.
2 Key Features
• Input: 10V to 26V
• Output: 9 to 12 LEDs at 1A
• Thermal Foldback / Analog Dimming
• PWM Dimming up to 30 kHz
• External Synchronization > 360 kHz
• Input Under-voltage and Output Over-voltage Protection
Figure 1. Efficiency with 6 Series LEDS AT 1A
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1
SNVA398A–August 2009–Revised May 2013 AN-1969 LM3424 Boost Evaluation Board
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