ST STP24DP05 LED恒流驱动方案

ST公司的STP24DP05是带输出误差检测的24位移位寄存器恒流LED驱动器,包含有8x3位串进并出的移位寄存器,输出级有24个可调整的电流源,提供5-80mA恒定电流来驱动LED.电源电压可低到3V,输出电压可高达20V,主要应用在LCD屏显示器.本文介绍了STP24DP05的主要特性, 方框图和典型应用电路图.

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 8x3 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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