描述 Description

The LED2000 is an 850 kHz fixed switching frequency monolithic step-down DC-DC converter designed to operate as 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 is set connecting a sensing resistor to the feedback pin. The embedded synchronous rectification and the 100 mV typical RSENSEvoltage drop enhance the efficiency performance. The size of the overall application is minimized thanks to the high switching frequency and ceramic output capacitor compatibility. The device is fully protected against thermal overheating, overcurrent and output short-circuit. The LED2000 is available in VFQFPN 4 mm x 4 mm 8-lead, and standard SO8 package.

特性 Features

? 3.0 V to 18 V operating input voltage range
? 850 kHz fixed switching frequency
? 100 mV typ. current sense voltage drop
? PWM dimming
? ± 7% output current accuracy
? Synchronous rectification
? 95 mΩ HS / 69 mΩ LS typical RDS(on)
? Peak current mode architecture
? Embedded compensation network
? Internal current limiting
? Ceramic output capacitor compliant
? Thermal shutdown

簡(jiǎn)介

LED2000屬于集成電路（IC）的LED驅(qū)動(dòng)器。由制造生產(chǎn)的LED2000LED 驅(qū)動(dòng)器器件屬于 LED 驅(qū)動(dòng)器電源管理集成電路 (PMIC) 系列，可通過(guò)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?duì)器件工作點(diǎn)進(jìn)行外部控制，可在照明應(yīng)用中用于實(shí)現(xiàn)調(diào)光功能。