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

STMicroelectronics ALED7709 Automotive LED Drivers

Features

Applications

Block Diagram

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