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[原创]On Semi NCV7683增强100mA汽车顺序LED照明线性控制方案

关键词:电源管理 LED驱动器 线性稳压器 On Semi NCV7683

时间:2021-01-14 15:42:55       来源:中电网

On Semi公司的NCV7683是汽车顺序LED照明的增强100mA线性稳压器和控制器.NCV7683包含老八个线性可编程恒流源,LED亮度等级用两个外接电阻容易编程.采用外接镇流FET允许需要大电流的设计进行功率分配.设定反向功率限制降低了过压条件下的驱动电流.当没有外接FET时对于低功率应用,这是非常有用的.排序功能由单独引脚激活,控制和编程.此外排序间隔的编程,器件能排序八个单独输出通路,4对输出通路,2个四路输出通路或一次所有8路(大电流可使用多个IC).主要用在后组合灯(RCL), 日行灯(DRL),雾灯, 中央高位刹车灯(CHMSL)阵列,转向灯和其它外部安装应用以及信标灯.本文介绍了NCV7683主要特性,框图,多种应用框图以及评估板NCV7683GEVB主要特性,电路图和材料清单.

 

The NCV7683 consists of eight linear programmable constantcurrent sources. The part is designed for use in the regulation andcontrol of LED based Rear Combination Lamps and blinkingfunctions for automotive applications. System design with theNCV7683 allows for two programmed levels for stop (100% DutyCycle) and tail illumination (programmable Duty Cycle), or anoptional external PWM control can be implemented.

LED brightness levels are easily programmed (stop is programmedto the absolute current value, tail is programmed to the duty cycle)with two external resistors. The use of an optional external ballast FETallows for power distribution on designs requiring high currents. Setback power limit reduces the drive current during overvoltageconditions. This is most useful for low power applications when ..

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