LM3485开发板套件编程器的评估板-LED驱动器规格书PDF中文资料

LM3485属于开发板套件编程器的评估板-LED驱动器。由德州仪器制造生产的LM3485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。

1 Features

• Easy-to-Use Control Methodology

• No Control-Loop Compensation Required

• 4.5-V to 35-V Wide Input Range

• 1.242-V to VIN Adjustable Output Range

• High Efficiency 93%

• ±1.3% (±2% Over Temp) Internal Reference

• 100% Duty Cycle

• Maximum Operating Frequency > 1 MHz

• Current Limit Protection

2 Applications

• Set-Top Box

• DSL or Cable Modem

• PC/IA

• Auto PC

• TFT Monitor

• Battery-Powered Portable Applications

• Distributed Power Systems

• Always On Power

3 Description

The LM3485 is a high-efficiency PFET switching

regulator controller that can be used to quickly and easily develop a small, low-cost, switching buck

regulator for a wide range of applications. The

hysteretic control architecture provides for simple

design without any control-loop stability concerns using a wide variety of external components. The

PFET architecture also allows for low component

count as well as ultralow dropout, 100% duty cycle

operation. Another benefit is high efficiency operation

at light loads without an increase in output ripple.

Current limit protection is provided by measuring the

voltage across the RDS(ON) of the PFET, thus

eliminating the need for a sense resistor. The cycle-

by-cycle current limit can be adjusted with a single

resistor, ensuring safe operation over a range of

output currents.