SEA05L中文资料具有极高效LED指示灯驱动器的高级恒定电压和恒定电流控制器数据手册ST规格书

描述 Description

The device is a highly integrated solution for SMPS applications, with an LED pilot-lamp requiring a dual control loop to perform CV (constant voltage) and CC (constant current) regulation.

The IC allows very efficient LED pilot-lamp driving which helps to reduce the standby consumption of the SMPS. It integrates a voltage reference, two op-amps (with OR-ed open-drain outputs), a low-side current sensing circuit and an LED pilot-lamp driver pin implemented with an open-drain mosfet driven by square waveform with 12.5% duty cycle at 1 kHz that allows reducing LED consumption.

The voltage reference, along with one op-amp, is the core of the voltage control loop. The current sensing circuit and the other op-amp make up the current control loop.

The external components needed to complete the two control loops are:

- a resistor divider that senses the output of the power supply and fixes the voltage regulation setpoint at the specified value

- a sense resistor that feeds the current sensing circuit with a voltage proportional to the DC output current; this resistor determines the current regulation setpoint and must be adequately rated in terms of power dissipation

- the frequency compensation components (R-C networks) for both loops.

The device is ideal for space-critical applications.

特性 Features

• Constant voltage and constant current control
• Very efficient LED pilot-lamp driver
• Wide operating VCCrange (3.5 V - 36 V)
• Low quiescent consumption: 250 μA
• Voltage reference: 2.5 V
• Voltage control loop accuracy ± 0.5%
• Current sense threshold: 50 mV
• Current control loop accuracy ± 4%
• Low external component count
• Open-drain output stage
• SOT23-6L package

简介

SEA05L属于集成电路（IC）的电源管理-专用。由制造生产的SEA05L电源管理 - 专用专用型电源管理集成电路 (PMIC) 用于电源的控制或操作，适合特定或小范围的目标应用，例如汽车气囊管理、电容器组平衡、AC 公共电力监控、存储器总线端接、接地故障检测、能量收集、小型引擎管理、处理器或芯片集专用电压调节、负载突降保护、触觉驱动器、热电制冷器控制等。