Automotive-Grade Backlight LED Driver Optimized for LCD Panels
Rohm announced the availability of the latest LED driver IC, the BD81A76EFV-M, optimized for LCD backlight in instrument cluster, center information displays and car navigation. Unlike conventional drivers with 4 channels that support LCDs up to 8”, this IC provides 6 channels of output (with 120mA per channel) that can support LCD panels of up to 10-12” class.
At the same time original buck-boost control ensures compatibility with both small and large LCDs using a single driver. This makes it possible to develop a common design of LCD control board suitable for conventional panels along with the latest large-size displays.
In recent years, to improve both visibility and design in the automotive field, LCDs are being used in an increasing number of systems including instrument clusters, head-up displays and car navigation. In addition, larger screen sizes are being demanded. They require a greater number of high brightness LEDs for backlight as well as LED drivers featuring multi-channel operation and advanced dimming features that can prevent flicker effects.
In response to this increasing market need, Rohm has leveraged its industry-leading analog design technology and incorporated proprietary technologies into its LED drivers to achieve flicker-free operation and to contribute to a common control board design. The BD81A76EFV-M also allows designers to use larger LCD panels in vehicle applications.
“Rohm’s new LED driver allows flexibility of design in modern display architectures and ensures backwards compatibility providing cost effectiveness,” Stefan Drouzas, Product Marketing Manager Automotive Display Products, ROHM Semiconductor GmbH.
- Original buck-boost control supports a common control board design
The BD81A76EFV-M incorporates proprietary buck-boost control to provide greater application flexibility in LCD applications. In contrast to conventional 6-channel backlight LED drivers utilizing only boost control. Although conventional LED drivers are only capable of driving 36 to 60 LEDs (6-10 LEDs/channel), Rohm’s new driver IC expands the range from 6 to 60 LEDs (1-10 LEDs/channel). This ensures the support of not only larger displays but also small and medium size panels as well using a single driver, contributing to a common design of control board.
- Class-leading 6 channel output enables compatibility with the latest 12” displays
Incorporating a constant current driver with low heat generation enables a best-in-class 6-channel LED current output of 120mA per channel. Unlike conventional 4 channels products that support LCDs up to 8”, Rohm’s new driver can accommodate larger panels in the 10-12” class. In addition, proprietary pwm dimming technology provides a dimming ratio of 10,000:1, improving visibility and greater design flexibility for center information displays and instrument clusters.
- Low standby current minimizes power consumption
Leveraging analog design expertise and process technologies allowed Rohm to reduce standby current consumption to just 10µA. This reduces power consumption to less than 1/3 compared with functionally equivalent products featuring a standby current of 40µA (typ.).
- Spread spectrum function ensures high reliability, low noise operation
In addition to obtaining qualification under the international AEC-Q100 standard for automotive reliability, the BD81A76EFV-M integrates a spread spectrum function as a countermeasure against EMI that allows it to clear CISPR25 noise requirements for vehicle applications. The result is stable operation in automotive systems sensitive to noise.
Now (samples), October 2019 (OEM quantities)