CAT4139中文资料White LED Driver, High Current Boost, 22 V数据手册ONSEMI规格书

描述 Description

The CAT4139 is a DC/DC step-up converter that delivers an accurate constant current ideal for driving LEDs. Operation at a fixed switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor R1. The CAT4139 is ideal for driving parallel strings of up to five white LEDs in series or up to 22 V.LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown input pin allows the device to be placed in power-down mode with 'zero' quiescent current.In addition to thermal protection and overload current limiting, the device also enters a very low power operating mode during 'Open LED' fault conditions.

特性 Features

• Switch Current Limit 750 mA
• Drives LED strings up to 22 V
• Up to 87% Efficiency
• Low Quiescent Ground Current 0.6 mA
• 1 MHz Fixed Frequency Low noise Operation
• Soft start “in-rush” current limiting
• Shutdown current less than 1 µA
• Open LED Overvoltage Protection
• Automatic Shutdown at 1.9 V (UVLO)
• Thermal overload protection

应用 Application

• LED Drive for Parallel Strings
• GPS Navigation Systems
• Portable Media Players

简介

CAT4139属于开发板套件编程器的评估板-LED驱动器。由制造生产的CAT4139评估板 - LED 驱动器LED 驱动器评估板是带有元器件的电路板，用于提供特定电路或器件的工作实例。该系列评估板提供一个 LED 驱动器实例，用于可调节闪烁、模拟亮度、背光、双极开关、升压转换器、亮度控制、相机闪光灯、可调光、恒流和 RGB 控制，以及更多其他应用。