STMicroelectronics LED Front Lighting System Solution
STMicroelectronics LED Front Lighting System Solution offers a wide selection of high- and low-side drivers to turn interior, front and rear lights from higher power “front beam” lamp to low power loads as indicators and rear lights. Car headlights, taillights, and flashers reliability represent a key factor for car drivers and pedestrian safety.
Applications
- Front LED lighting systems
- Low beam
- High beam
- Daytime running light
- Turn indicator
- Position, side and fog light
L99LD21 Product Benefits
STMicroelectronics L99LD21 is a flexible LED driver, which is specifically designed for the control of two independent high brightness LED strings for automotive front lighting applications. The Driver consists of a high-efficiency monolithic boost controller and a dual buck converter.
Features
- ST SPI communication v4.1
- 5.5 to 24V Operating battery voltage range
- Load dump protected
- QFN40L 6x6 (wettable flanks) with exposed pad
- Low standby current
- Integrated PWM generation unit with 10-bit resolution and phase shift
- LED voltage digital feedback through SPI
- Board size 100 x 55mm
- Two extension headers (2 x 36 pin - 100mil) for quick connection to SPC560B-DIS discovery board
- Controllable by dedicated GUI available on www.st.com
- Free ready to run application firmware available on www.st.com, to support quick evaluation and development
- 2 soldered L99LD21 flexible LED drivers
- Boost Regulator
- With fixed frequency architecture and programmable by SPI, with input current limitation, overvoltage protection (OVP) and constant voltage control
- Buck regulator
- Lossless current sensing without need of external components, very accurate LED current setting programming inductor's peak current and peak-to-peak current ripple
- Adjustable peak current by SPI and adjustable current ripple by SPI
Block Diagram
Associated Dev Tools
STMicroelectronics SPC560B-DIS Discovery Evaluation Board
Low-cost & easy way to discover SPC56 B line of MCUs to address the automotive applications.
STMicroelectronics L99LD21-ADIS Development Board
Drives four independent high brightness LED strings for automotive front lighting applications.
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