STMicroelectronics L99LD01 高效恒流 LED 驱动器

意法半导体 L99LD01 高效恒流 LED 驱动器是一款完整的恒流直流-直流转换器 LED 驱动器，适用于汽车应用。它采用 BCD5S 70V 技术制造，并以 LQFP32 封装形式组装。L99LD01 用于升压、降压-升压和反激式转换器拓扑。一个内部随机抖动振荡器在低频模式下工作，扩大了开关频率的射频频谱，从而降低 EMC。

The device includes an internal low drop voltage regulator, that can be used to supply a microcontroller, and a reset pin, that is useful for resetting the microcontroller at the start up and every time that the regulated output voltage falls down below an established voltage threshold.

特性

Automotive qualified
Constant current operation
Current LED settable by external sensing resistor and adjustable via SPI
Converter switching frequency adjustable by external resistor (RSF)
EMC reduction by internal spread spectrum dither oscillator
Low frequency PWM dimming operation
Maximum input current limiter
Maximum switching duty cycle limiter
Slope compensation adjustable by external resistor (R9)
Battery overvoltage shutdown protection (ext. R3, R4 resistors required)
LED chain OV detection (ext. R5, R6)

Multiplexed output for monitoring and control of LED temperature (external NTC resistor required), voltage of LED chain, and low frequency PWM
SPI communication serial interface transceiver (SDI, SDO, SCK, CSN)
Regulated output for micro supply 5V ±2% -20mA
Parameter programming and settings of internal memory registers by the dedicated SPI interface:
LED current reference adjusting (±66.7%)
Maximum input current limiter reference adjusting (±55.5%)
Random dither frequency sweeping, modulation frequency and deviation percentage
Power on reset pin output
ESD protection