ST STP24DP05 24位恒流LED驱动方案

ST 公司的STP24DP05是带输出误差检测的24位恒流LED沉驱动器,包括8x3位串进并出的移位寄存器,输出级有可调整的恒流源,提供5-80mA电流来驱动LED.电源电压可低至3V,通过外接电阻可调整输出电流,25MHz时钟频率,具有短路和开路输出误差检测.本文介绍了STP24DP05主要特性,方框图,典型应用电路以及采用STP24DP05和STM32的LED调光演示板STEVAL-ILL015V1的主要特性,详细电路图和所用材料清单.

STP24DP05: 24-bit constant current LED sink driver with output error detection

The STP24DP05 is a monolithic, low voltage, low current power 24-bit shift register designed for LED panel displays. The device contains a 8 x 3-bit serial-in, parallel-out shift register that feeds a 8 x 3-bit D-type storage register. In the output stage, twenty-four regulated current sources were designed to provide 5-80 mA constant current to drive the LEDs.

The 8 x 3 shift registers data flow sequence order can be managed with two dedicated pins. The STP24DP05 has a dedicated pin to activate the outputs with a sequential delay, that will prevent inrush current during outputs turn-ON. The device detection circuit checks 3 different conditions that can occur on the output line: short to GND, short to VO or open line.
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