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STMicroelectronics ALED7709 Automotive LED Drivers

STMicroelectronics ALED7709 Automotive LED Drivers are AEC-Q100 Grade1 qualified and combine a boost/SEPIC controller and four low-side constant-current sinkers. The STMicroelectronics ALED7709 is designed to drive strings of high-brightness LEDs. The switching converter section provides the supply rail for the LED strings, whose value is constantly optimized for maximum efficiency. The boost/SEPIC controller supports the external synchronization and spread spectrum.

Features

  • AEC-Q100 Grade1 qualified
    • Operating temperature range -40°C < TJ < 150°C
  • 4.5V to 42V operating input voltage range
    • Up to 60V tolerant for load dump @ 24V battery
    • Supports battery cranking events down to 4V supply
  • Simultaneous or exclusive control by PWMI and I2C interface
  • Switching controller section
    • Low shutdown current ISHDN < 15µA
    • Fixed frequency peak current-mode controller
    • Cycle-by-cycle power switch OCP
    • Adjustable (250kHz to 2.2MHz) switching frequency with optional spread spectrum
    • Synchronized boost and SEPIC topologies support
    • Line switch control for standby power saving and inrush current protection
    • Input overvoltage and output short-circuit protection
  • LED strings control section
    • 4 x 40V rated constant current outputs
    • Adjustable up to 200mA per channel
    • ±2% typ. output current accuracy
    • Mixed PWM and Analog dimming
    • 100Hz to 12.8kHz dimming frequency
    • Dimming ratio 10000:1 at 100Hz
    • LED temperature sensor (NTC) management
    • Selectable channels phase-shifting and adjustable Rise/Fall time for reducing EMI
    • Open channel, LED short-circuit detection
    • Two versions are available ALED7709A and ALED7709B

Applications

  • Automotive lighting and backlighting
    • Cluster/infotainment display
    • Head-Up Display (HUD)
    • Instrument lighting system
    • Ambient light

Block Diagram

Block Diagram - STMicroelectronics ALED7709 Automotive LED Drivers

Evaluation Board

STMicroelectronics STEVAL-LLL014V1 Automotive LED Driver Eval Kit

Features four LED strings and employs the ALED7709 LED driver.

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A broad range of drop-in replacements for general-purpose analog ICs, discretes, and serial EEPROMs.

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Publicerad: 2023-04-03 | Uppdaterad: 2023-09-13