With the continuing evolution of ADAS (Advanced Driver Assistance Systems) and enhanced car infotainment functionality there has been growing demand and use of larger displays. Consequently, LED drivers for LCD backlights in automotive displays need to be highly efficient in order to improve rated output current while reducing power consumption. In addition, as flickering of automotive displays can lead to poor visibility and unsafe conditions, LED drivers must also be capable of addressing this problem.
Conventional LED drivers consume relatively large amounts of power and are susceptible to flickering during PWM dimming. In response, ROHM has developed LED drivers for LCD backlights that combine proprietary low power technology with seamless PWM dimming - eliminating flickering when changing display brightness from low to high.
These new products leverage proprietary low power consumption technology to reduce losses in LED driver current control circuits. The result is 20% lower overall IC power consumption compared to conventional products under typical conditions (80mA/ch LED circuit current, 12V power supply). This contributes to lower power consumption in medium- to large-sized automotive displays where power consumption is an issue.
All models are also equipped with both DC and PWM dimming to meet a wide range of requirements. As there no longer exists a need to switch current feedback mode for low/high brightness change with ROHM’s PWM dimming technology, flickering that occurs with general PWM dimming is reduced, improving system reliability.
Reference Designs with PCB Design data, SPICE models and EMC reports available.
All new model products are equipped with both DC and PWM dimming for broad applicability.
