IS32LT3177数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The IS32LT3177 and IS32LT3178 are adjustable linear current devices with excellent temperature stability. A single resistor is all that is required to set the operating current from 10mA to 200mA. The devices can operate from an input voltage from 2.9V to 40V with a minimal voltage headroom of 1.0V (Typ.) at 150mA. Designed with a low dropout voltage; the device can drive LED strings close to the supply voltage without switch capacitors or inductors.

The IS32LT3177/78 simplifies designs by providing a stable current without the additional requirement of inductors, FETs or diodes. The complete constant current driver requires only a current set resistor and a small PCB area making designs both efficient and cost effective.

The EN Pin of the IS32LT3177 can be tied to VBAT or PSM (Power Supply Modulation) signal for high side dimming. The EN Pin of the IS32LT3178 can function as the PWM signal input used for MCU PWM dimming.

As a current sink it is ideal for LED lighting applications or current limiter for power supplies.

The device is provided in a lead (Pb) free, SOT23-6 and SOP-8-EP packages.

特性 Features

• Low-side current sink ▪ Adjustable from 10mA to 150mA (SOT23-6)/200mA (SOP-8-EP) with external resistor selection
• Wide input voltage range from below voltage with a low dropout of typical 1.0V at 150mA ▪ 2.9V to 40V (IS32LT3178) ▪ 5V to 40V (IS32LT3177)
• Up to 1kHz PWM input (IS32LT3178 only)
• Protection features: ▪ 0.6%/K current roll off at high temp over 145°C for thermal protection ▪ Output current limit ▪ Thermal shutdown
• Up to 0.77W (SOT23-6)/2.32W (SOP-8-EP) power dissipation in a small package
• RoHS compliant (Pb-free) package
• AEC-Q100 Qualified

应用 Application

• Automotive and avionic lighting
• Stop/tail light
• Turn light
• Retail lighting in fridge, freezer case and vending machines

简介

IS32LT3177属于集成电路（IC）的LED驱动器。由制造生产的IS32LT3177LED 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。