L99LD20中文资料High power LED driver for automotive applications数据手册ST规格书

描述 Description

The L99LD20 is a flexible LED driver, which is specifically designed for the control of two independent high brightness LED strings for automotive front lighting applications. It consists of a high efficiency monolithic dual buck converter.
The buck converters integrate n-channel MOSFET which is driven by a bootstrap circuit.
When more than two LED channels are required on one module, then more devices L99LD20 can be combined; also with L99LD21 device - incorporating Boost Controller - from which L99LD20 derivate.

特性 Features

• AEC-Q100 qualified
• General
• ST SPI communication v4.1
• 5.5 to 24 V Operating battery voltage range
• Load dump protected
• QFN40L 6x6 (wettable flanks) with exposed pad
• Timeout watchdog and limp home function
• Low standby current
• Buck section
• Integrated switching mosfets
• Lossless current sensing without need of external components
• Very accurate LED current setting programming inductor's peak current and peak-to-peak current ripple
• Adjustable peak current by SPI
• Adjustable current ripple by SPI
• Integrated PWM generation unit with 10-bit resolution and phase shift
• Peak current control
• Constant VLED x TOFF architecture
• Protection and diagnostic
• Battery under voltage
• Temperature warning (2 thresholds)
• Overtemperature shutdown
• LED voltage digital feedback through SPI
• Buck outputs short circuit and open load protection

简介

L99LD20属于集成电路（IC）的LED驱动器。由制造生产的L99LD20LED 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。