L99LD21中文资料High power LED driver for automotive applications数据手册ST规格书

描述 Description

The L99LD21 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 boost controller and a dual buck converter.
The boost controller integrates a high current gate driver for an external n-channel mosfet. It delivers a constant output voltage, up to 60 V, which supplies the inputs of the two integrated or external buck converters.
The boost controller of two devices can be stacked, in order to operate in dual phase for high power applications, with an interleaving pattern for an improved input current ripple.
The buck converters integrate n-channel mosfet which is driven by a bootstrap circuit.

特性 Features

• AEC-Q100 qualified
• ST SPI communication v4.1
• Load dump protected
• Timeout watchdog and limp home function
• Boost Section
• Peak current mode control
• Input current limitation
• Overvoltage protection (OVP)
• Constant voltage control
• Buck section
• Lossless current sensing without need of external components
• Adjustable peak current by SPI
• Integrated PWM generation unit with 10-bit resolution and phase shift
• Constant VLED x TOFF architecture
• Battery under voltage
• Overtemperature shutdown
• Buck outputs short circuit and open load protection

简介

L99LD21属于集成电路（IC）的LED驱动器。由制造生产的L99LD21LED 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。