描述 Description

The CAT4008 is an 8 channel constant current driver for LED billboard and other general display applications. LED channel currents are programmed together via an external RSET resistor. Low output voltage operation on the LED channels as low as 0.4 V (for 2 to 100 mA LED current) allows for more power efficient designs.A high-speed 4-wire serial interface of up to 25 MHz clock frequency controls each individual channel using a shift register and latch configuration. A serial output data pin (SOUT) allows multiple devices to be cascaded and programmed via one serial interface. The device also includes a blanking control pin (BLANK) that can be used to disable all channels independently of the interface.Thermal shutdown protection is incorporated in the device to disable the LED outputs if the die temperature exceeds a set limit.

特性 Features

? 8 Constant current-sink channels
? Serial interface up to 25 MHz clock frequency
? 3 V to 5.5 V logic supply
? LED current range from 2 mA to 100 mA
? LED current set by external RSET resistor
? 300 mV LED dropout at 30 mA
? Thermal shutdown protection

應(yīng)用 Application

? Billboard Display
? Marquee Display
? Instrument Display
? General Purpose Display

簡介

CAT4008屬于集成電路（IC）的LED驅(qū)動器。由制造生產(chǎn)的CAT4008LED 驅(qū)動器器件屬于 LED 驅(qū)動器電源管理集成電路 (PMIC) 系列，可通過標(biāo)稱固定電壓的電源為負(fù)載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調(diào)節(jié)的類似產(chǎn)品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通?？蓪ζ骷ぷ鼽c進(jìn)行外部控制，可在照明應(yīng)用中用于實現(xiàn)調(diào)光功能。