ALED1262ZT中文资料汽车级12通道LED驱动器，支持开路检测、局部调光、总线驱动和独立操作数据手册ST规格书

描述 Description

The ALED1262ZT is a monolithic 12 output LED driver designed for automotive exterior and interior lighting applications. The ALED1262ZT guarantees 19 V output driving capability allowing users to connect several LEDs in series. In the output stage, twelve regulated current sources provide from 6 mA to 60 mA constant current to drive LEDs. The current is programmed by a single external resistor. In the ALED1262ZT, LED open error detection is available.

The brightness can be adjusted separately for each channel through a 7-bit grayscale control. A slow turn-on and turn-off time improves the system low noise generation performance. Moreover the gradual output delay reduces the inrush current. To further increase EMI performance, this device implements an internal clock dithering to have a spread spectrum noise reduction.

Thermal management is equipped with overtemperature data alert and the output thermal shutdown (170 °C). The I²C high clock frequency, up to 400 kHz, makes the device suitable for high data rate transmissions. The supply voltage range is between 5.5 V and 38 V avoiding any external pre-regulation or additional load dump protection on the power supply stage.

This device can operate in bus-driven mode (BDM) using I²C interface or in standalone mode (SAM) using internal custom configuration by OTP.

特性 Features

• Designed for automotive applications
• 12 constant current output channels
• 19 V current generator rated voltage
• Output current: from 6 mA to 60 mA
• Current programmable by a single external resistor
• 7-bit PWM local brightness control
• Slow turn-on/off time, gradual output delay and dithered clock for EMI reduction
• Error detection for open LEDs
• Supply voltage: from 5.5 V to 38 V
• Thermal shutdown and overtemperature alert
• Standalone and bus-driven mode
• Custom configuration by OTP with Redundancy and ECC
• 400 kHz fast I²C interface with selectable extended Hamming encoding
• Wired-OR error flag connection

简介

ALED1262ZT属于集成电路（IC）的LED驱动器。由制造生产的ALED1262ZTLED 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。