LED5000中文资料具有调光功能的3 A单片式降压电流源数据手册ST规格书

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 mΩ typical RDSON
• Peak current mode architecture
• Short-circuit protection
• Compliant with ceramic output capacitors
• Inhibit for zero current consumption
• Thermal shutdown

简介

LED5000属于集成电路（IC）的LED驱动器。由制造生产的LED5000LED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。