Solution Description
Car headlights, taillights and flashers reliability represent a key factor for car driver and pedestrian safety: ST 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 back lights.
Target Applications
- Front LED lighting systems
- Low Beam
- High Beam
- Daytime Running Light
- Turn Indicator
- Position, Side and Fog Light
-
Key Product Benefits
The 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. It consists of a high efficiency monolithic boost controller and a dual buck converter.
- ST SPI communication v4.1
- 5.5 to 24 V Operating battery voltage range
- Load dump protected
- QFN40L 6x6 (wettable flanks) with exposed pad
- Low standby current
- 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
- Integrated PWM generation unit with 10-bit resolution and phase shift
- LED voltage digital feedback through SPI
- 2 soldered L99LD21 flexible LED drivers
- Board size 100 x 55 mm
- Two extension headers (2 x 36 pin - 100 mil) 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
