STMicroelectronics- L99LD01 – automotive LED driver
The L99LD01 is a boost controller dedicated to the control of high-brightness LEDs in vehicle headlight applications. This device offers high software
configurability and architecturetopology flexibility using a versatile platform approach. The scalable solution enables a cost-optimized selection of the
power components and provides full diagnostics and protection for
enhanced system reliability.
Key features – general section
- Input voltage range: 5 to 40 V
- Operating junction temperature: -40 to 150 °C
- Adjustable switching frequency: 100 to 500 kHz
- Constant frequency, peak current mode control
- Cycle-by-cycle input current limitation
- Spread spectrum
- Ajustable input/output overvoltage protection
- SPI interface
- Software configurable maximum input current
- 5 V regulator with watchdog and reset control
Key features – LED driver
- High-side current sense
- Enhanced high-side PWM dimming
- LED over-temperature detection and protection with external NTC
- Analog multiplexer to monitor the NTC input and LED’s forward voltage
- Protection against shorted output to GND
- Software configurable LED current Key benefits
- Software configurability for platform approach
- Enhanced and detailed diagnostics
- Compatible with boost, floating buck-boost and flyback topologies
- Operation with and without microcontroller
- External MOSFET for scalability
- Single wire to the LED strings
- Low electromagnetic emission
- Full application protection
- Supports fail-safe strategies (ASILB, ISO 26262)
- Compatible with both microcontroller and standalone configuration
Main applications
- LED headlamps
- LED signal lights
- LED daytime running lights
Link to the Datasheet
