ALED1642GW参考设计电路|LED 显示驱动器应用电路

ALED1642GWLED显示驱动器是单片、低电压、低电流、16位移位寄存器，用于LED面板显示屏。此篇主要介绍了ALED1642GW特性、应用范围、参考设计电路以及电路分析，帮助大家缩短设计时间。

ALED1642GW特性：20V电流发射器额定电压；16个恒定电流输出通道；输出电流:3mA至40mA；在两个范围内的7位全局电流增益调节；自动节约功耗/自动唤醒；电源电压：3V至5.5V

ALED1642GW典型应用范围：全色/单色显示器；仪表盘（背光LED指示器）；汽车车内照明

ALED1642GW参考设计应用电路：

图1ALED1642GW内部结构框图

The ALED1642GW is a monolithic, low voltage,low current power 16-bit shift register designed for LED panel displays. The ALED1642GW guarantees 20 V output driving capability allowing the user to connect several LEDs in series. In the output stage, sixteen regulated current sources provide from 3 mA to 40 mA constant current to drive the LEDs. The current is programmed through an external resistor and can be adjusted by 7-bit current gain register in two subranges.The brightness can be adjusted separately for each channel through a 12/16-bit grayscale control.

图2ALED1642GW参考设计图

Thermal management is equipped with overtemperature data alert and the output thermal shutdown(170°C).The high clock frequency is up to 30MHz and it makes the device suitable for high data rate transmission. A selectable gradual output delay reduces the inrush current whereas the selectable SDO synchronization feature works when the device is used in daisy chain configuration. The supply voltage range is between 3V and 5.5 V.

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