On Semi公司的NCV7692汽车LED灯电流控制器,采用外接NPN双极器件和反馈电阻来调整驱动LED的电流.单个驱动器使用户能灵活增加单路到多路系统中.专用的调光特性通过PWM输入引脚来实现.当检测到开路或短路时单路驱动器就开关断.LED亮度采用串联在双极晶体管的外接电阻进行编程.单个NCV7692可驱动多个LED串.NCV7692可采用PWM控制,外接可编电流电阻,可选择负温度系统电流控制,开路LED串和短路LED串诊断,多个LED串控制,满足AEC−Q100 规范和PPAP功能.主要用在汽车后组合灯(RCL),日间灯(DRL),雾灯,中央高位刹车灯(CHMSL)阵列,转向灯和其它外部调制应用,通用汽车线性电流LED驱动器.本文介绍了NCV7692主要特性,框图和多种应用框图,以及评估板EVBUM2664主要特性,电路图和评估板EVBUM2664应用电路与PCB设计图.
The NCV7692 is a device which uses an external NPN bipolar device combined with feedback resistor(s) to regulate a current for use in driving LEDs. The target application for this device is automotive rear combination lamps. A single driver gives the user flexibility to add single channels to multichannel systems. A dedicated dimming feature is included via the PWM input pin. The individual driver is turned off when an open load or short circuit is detected.
LED brightness levels are easily programmed using an external resistor in series with the bipolar transistor. The use of the resistor gives the user the flexibility to use the device over a wide range of currents. Multiple strings of LEDs can be operated with a single NCV7692 device. Set back power limit reduces the d