描述 Description

The LED5000 device is an 850 kHz fixed switching frequency monolithic step-down DC-DC converter designed to operate as a precise constant current source with an adjustable current capability up to 3 A DC. The embedded PWM dimming circuitry features LED brightness control. The regulated output current level is set by connecting a sensing resistor to the feedback pin. The 200 mV typical RSENSE voltage drop enhances performance in terms of efficiency. The size of the overall application is minimized thanks to the high switching frequency and its compatibility with ceramic output capacitors. The device is fully protected against overheating, overcurrent and output short-circuit. The LED5000 is available in an HSOP8 package.

特性 Features

? 5.5 V to 48 V operating input voltage range
? 850 kHz fixed switching frequency
? 200 mV typ. current sense voltage drop
? Buck / buck-boost / floating boost topologies
? PWM dimming
? ± 3% output current accuracy overtemperature
? 200 m? typical RDSON
? Peak current mode architecture
? Short-circuit protection
? Compliant with ceramic output capacitors
? Inhibit for zero current consumption
? Thermal shutdown

簡介

LED5000屬于集成電路（IC）的LED驅(qū)動器。由制造生產(chǎn)的LED5000LED 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），而且通常可對器件工作點(diǎn)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。