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STMicroelectronics ALED7707 LED Drivers

STMicroelectronics ALED7707 LED Drivers consist of an automotive grade (AEC-Q100-compliant) monolithic boost converter and six controlled current generators (rows) specifically designed to supply LED arrays used in the backlighting of LCD panels. This device can manage an output voltage up to 36V (such as 10 white LEDs per row). The generators can be externally programmed to sink up to 85mA and can be dimmed via a PWM signal (1% dimming duty cycle at 1kHz can be managed). STMicroelectronics ALED7707 LED Drivers allow the user to detect and manage the open and shorted LED faults and to let unused rows floating. Basic protections (output overvoltage, internal MOSFET overcurrent and thermal shutdown) are provided.

Features

  • Boost section
    • 4.5V to 36V input voltage range
    • Internal power MOSFET
    • Internal +5V LDO for device supply
    • Up to 36V output voltage
    • Constant frequency peak current-mode control
    • 250kHz to 1MHz adjustable switching frequency
    • External synchronization for multi-device application
    • Pulse skip power saving mode at light load
    • Programmable soft-start
    • Programmable overvoltage protection
    • Stable with ceramic output capacitors
    • Thermal shutdown
  • Backlight driver section
    • Six rows with 85mA maximum current capability (adjustable)
    • Rows disable option
    • Less than 10µs minimum dimming on-time
    • ±3% current matching between rows
    • LED failure (open and short-circuit) detection
  • AEC-Q100 qualification

Applications

  • Infotainment
  • LCD backlights
  • Daytime running lights
  • Car interior/exterior lights
  • Dashboard backlights

Development Tool

Publicado: 2015-07-20 | Atualizado: 2022-03-11