IS32LT3129数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The IS32LT3129 is a programmable triple channel linear current regulator; two channels of up to 150mA each for LED lighting and a single channel of up to 30mA for illuminating switches. The device operates as a fully configurable theatrical dimming LED driver; External resistors will program the current levels as well as the LED fade ON/OFF ramp rate.

In additional, the I2C interface supports writing/reading function for MCU to select switch type (momentary contact or latched), individually configure the output current levels and fade on/off ramp rate, or get the state of device and the fault flag of open/short circuit and thermal shutdown.

An integrated debounce and latch circuit on the channel enable pin (EN1/2) is enabled when the device is configured for a momentary contact switch interface. The other option is to configure the EN pins to accept a static level signal for operation with latched switches. If configured for Internal-PWM-Dimming mode, the integrated PWM source will be triggered by an I2C command. This enables LED dimming without the need for an external PWM input. The EN inputs have a higher priority and will override internal PWM. See Figure 63~69 for the details.

The device integrates a 63 step fade ON/OFF algorithm (Gamma correction) which causes the output LED brightness to gradually ramp up to the full source value after the EN1/2 pins are triggered or send I2C commands (when configured for Internal-PWM-Dimming mode). The same controller causes the LED brightness to gradually ramp down to zero if the EN1/2 pins are triggered or send I2C commands (when configured for Internal-PWM-Dimming mode) while the output channel is ON. The fade ramp can be interrupted mid-cycle before completion of the ramp cycle.

The IS32LT3129 is targeted at the automotive market with end applications to include map and dome lighting as well as exterior accent lighting. For 12V automotive applications the low dropout driver can support 1 to 3 LEDs per channel. It is offered in a small thermally enhanced eTSSOP-20 package.

特性 Features

• Operating voltage range, 5V to 42V
• 1MHz I2C-compatible interface
• Dual channel current sources ▪ Individual programmable current via a single external resistor and I2C▪ Configurable from 20mA to 150mA
• Single channel 30mA (Max.) current source for switch illumination
• EN input supports either momentary contact or latched switch ▪ Input is debounced and latched ▪ Higher priority than I2C input ▪ Gamma corrected Fade ON/OFF algorithm ▪ Pull down resistors or I2C set independent fade ON and OFF ramp time
• Selectable internal PWM source ▪ Internal 220Hz PWM source with Gamma corrected algorithm for automatic dimming the current source
• Fault Protection: ▪ Fault Reporting ◦ LED strings short ◦ LED strings open ◦ Over temperature thermal shutdown ▪ ISET pin shorted to GND ▪ Over temperature current roll off
• Operating temperature range from -40°C ~ +125°C
• AEC-Q100 Qualified

应用 Application

• Automotive Interior: ▪ Map/Dome light ▪ Puddle lamp in doors ▪ Glove box light ▪ Vanity mirror light

简介

IS32LT3129属于集成电路（IC）的LED驱动器。由制造生产的IS32LT3129LED 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。