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MAXREFDES1275: 1A,3-Channel LED Driver in Buck Configuration using MAX20050 and its dimming control using MAX32630FTHR

MAXREFDES1275

参考设计免责声明 参照  重要声明和免责声明  涵盖参考设计和其他Maxim资源

描述

The MAXREFDES1275 has three main blocks: the microcontroller, ADC/DAC IC MAX11311, and three LED drivers. The brightness of each LED string can be set by applying an industry standard 0V to 10V dimming signal. The LED brightness should scale linearly to this signal. A conversion is required as the range and offset of the analog DIM input on the LED driver is different from this 0V to 10V signal. The microcontroller manages this by sampling the 0V to 10V DIM signals with the ADCs, calculating the new values, and forwarding them as analog voltages to the LED drivers with the DACs. A PC can be connected for a calibration procedure as the offset and maximum current can vary between the channels. The new constants are stored in the flash memory after calibration.

特征

  • Active low-fault (FLT) indicator
  • Output short-circuit protection
  • High-side current regulation eliminates one connection to the LED string
  • 5V, 10mA LDO output provides bias to other circuits
  • Ultra-low shutdown current (5μA typ)

Icon

设计, 制作, 测试

图中的电路板已经完成封装和测试。不可售。

 

示意图

PCB布局

物料清单(BOM)

参数化

输入类型 Vin(Min) Vin(Max) Iout(Max) 单路/多路输出 Vout(V) Pout(W) 隔离/非隔离 拓扑
DC 36 54 1 Multiple Output - - - Buck

参数化

输入类型 DC
Vin(Min) 36
Vin(Max) 54
Iout(Max) 1
单路/多路输出 Multiple Output
Vout(V) -
Pout(W) -
隔离/非隔离 -
拓扑 Buck

Maxim设备 (1)

器件号 名称 产品线 购买 设计套件和评估模块
MAX17632 4.5V至36V、2A、高效、同步降压型DC-DC转换器 开关稳压器 立即购买 Design Kits

Maxim设备 (1)

器件号 产品线
开关稳压器
4.5V至36V、2A、高效、同步降压型DC-DC转换器

设计资料 (3)

标题 类型 尺寸 日期
MAXREFDES1275 BOM CSV 4KB 2021-06-29
MAXREFDES1275 Schematic PDF 33KB 2021-06-29
MAXREFDES1275 PCB PDF 957KB 2021-06-29
日期 类型
2021-06-29

MAXREFDES1275 BOM

(CSV, 4KB)

2021-06-29

MAXREFDES1275 Schematic

(PDF, 33KB)

2021-06-29

MAXREFDES1275 PCB

(PDF, 957KB)

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