IS32LT3181中文资料A six channel linear current LED Driver数据手册Lumissil规格书

描述 Description

The IS32LT3181 is a six channel linear current regulator for automotive rear tail light applications such as RCL (Rear Combination Lamps) and CHMSL (Center High Mounted Stop Lamps). It is fully programmable with two LED brightness levels for the different intensity requirements of “stop” bright (DC mode) and “tail” dim (PWM mode).

A logic level at the PWM pin is used to select between the tail and stop output conditions. The stop condition provides the highest intensity output, while the tail condition utilizes an internally generated PWM signal to reduce the intensity of the LEDs’ light output.

An active low fault output signal reports a device error condition. The FAULTB pin of several devices can be tied together to disable all the output stages when a fault is detected by any one of the devices.

The sink current at the OUTx pins is easily set with a single resistor at the STOP pin. The constant-current sink outputs can be combined in parallel to create higher current-driving capability on a single string. A second resistor at the TAIL pin sets the duty cycle of the internal PWM oscillator for dimming the LED output when operating in the tail condition.

An external FET (optional) can be implemented for operation with wide varying supply voltages to minimize device thermal dissipation.

The IS32LT3181 is offered in an eTSSOP-16 package.

特性 Features

• Operating voltage from 6V to 42VDC ▪ Withstand 50V load dump
• 6 constant-current channel sinks ▪ Adjustable from 10mA to 75mA per channel ▪ Channel paralleling for higher current ▪ Low dropout voltage of 0.8V@35mA ▪ Slew rate control on each output for better EMI performance
• Integrated PWM dimming engine provides two LED brightness levels without external logic ▪ Tail duty cycle programmable from 1% to 95% ▪ PWM logic level input selects between full brightness and PWM dimming levels
• Support for optional FET to minimize device power consumption
• Open Drain FAULTB reporting pin ▪ Programmable FAULTB delay time ▪ Programmable UVLO threshold ▪ LED open circuit detection ▪ STOP pin over current protection ▪ Over temperature protection
• Device disable upon fault detection ▪ Parallel connection to other devices
• AEC-Q100 qualification

应用 Application

• Rear Combinational Lamp (RCL)
• Center High Mount Stop Light (CHMSL)
• Daytime running lamp
• Fog lamps
• Turn signal

简介

IS32LT3181属于集成电路（IC）的LED驱动器。由制造生产的IS32LT3181LED 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。