L99LD01中文资料High Efficiency Constant Current Led Driver数据手册ST规格书

描述 Description

L99LD01 is a precise constant current DC–DC converter LED driver for automotive applications, dedicated to the control of high-brightness LED headlights an housed in a LQFP32™ package.
The device is designed to be used in Boost, Buck-Boost and Fly back converter topologies. Aninternal random dither oscillator works in low frequency modulation, allowing the RFspectrum of the switching frequency to spread so to reduce EMC emissions. The slope compensation ensuresgood converter loop stability whatever is the duty cycle needed by the application.
The converter is able to work either in full power mode or in low frequency dimming mode.
The device includes an internal low drop voltage regulator, that can be used to supply amicrocontroller, and a reset pin, that is useful for resetting the microcontroller at thestart up and every time that the regulated output voltage falls down below an establishedvoltage threshold.

特性 Features

• Automotive qualified
• Current LED settable by external sensing resistor and adjustable via SPI
• EMC reduction by internal spread spectrum dither oscillator
• Maximum input current limiter
• Slope compensation adjustable by external resistor (R9)
• Battery overvoltage shut down protection (ext. R3, R4 resistors required)
• Multiplexed output for monitoring and control of LED temperature (external NTC resistorrequired), voltage of LED chain, and low frequency PWM
• Regulated output for micro supply 5 V ± 2 %-20 mA
• LED current reference adjusting (± 66.7%)
• Random dither frequency sweeping, modulation frequency anddeviation percentage
• ESD protection

简介

L99LD01属于集成电路（IC）的LED驱动器。由制造生产的L99LD01LED 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。