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ROHM’s New 4ch/6ch LED Drivers for LCD Backlights: Contribution to Lower Power Consumption in Medium to Large Automotive Displays
Built-in DC and PWM dimming support a wide range of design requirements
ROHM developed the 4ch/6ch LED driver ICs, BD83A04EFV-M, BD83A14EFV-M, and BD82A26MUF-M designed for medium to large size automotive displays in car infotainment and instrument clusters.


In recent years, the continuing evolution of ADAS (Advanced Driver Assistance Systems) and enhanced car infotainment functionality have led to the use of larger displays. Consequently, LED drivers for LCD backlights in automotive displays are required to provide high efficiency drive that improves rated output current while reducing power consumption. On top, as flickering of automotive displays can lead to poor visibility and unsafe conditions, LED drivers must be capable to avoid this symptom.

Conventional LED drivers consume relatively large amounts of power and are susceptible to flickering during PWM dimming. In contrast, ROHM has developed LED drivers for LCD backlights that combine proprietary low power technology with seamless PWM dimming. This eliminates 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.

At the same time, all models are 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 original seamless PWM dimming technology, flickering that occurs with general PWM dimming is reduced, improving system reliability.

Going forward, ROHM will continue to contribute to the evolution of next-generation mobility by developing products that leverage its strengths in analog technology to promote the advancement and lower power consumption in future automotive cockpit functions.


Reference Designs with PCB Design data, SPICE models and EMC reports available.

Applications
• Instrument clusters
• Car infotainment
• Head-up displays (HUDs)
• Electronic mirrors (side/rear view)

Product Lineup
All new models products are equipped with both DC and PWM dimming for broad applicability. ROHM’s seamless PWM dimming enables smooth, flicker-free dimming from low to high brightness.


Online Sales Information
Applicable Part Nos: BD83A04EFV-M, BD83A14EFV-M, BD82A26MUF-M
Availability: Now (in mass production)
Online Distributors: Digi-Key, Mouser, and Farnell
Scheduled for release at other online distributors as well.

2023040901 / 09.04.2023 / Electronic-components / ROHM Semiconductor /

ROHM Develops the First Silicon Capacitor BTD1RVFL Series
Achieving the industry’s smallest* size in a mass-produced surface mount package contributes to greater space savings in smartphones and other compact devices

ROHM’s New 4ch/6ch LED Drivers for LCD Backlights: Contribution to Lower Power Consumption in Medium to Large Automotive Displays
Built-in DC and PWM dimming support a wide range of design requirements

ROHM’s New Wireless Charger Modules: Facilitating Wireless Charging in Thin and Compact Devices
ROHM has developed compact wireless charger modules with an integrated antenna board: the BP3621 (transmitter) and the BP3622 (receiver). The new modules allow to add wireless power supply functionality to smaller devices such as smart tags/cards or PC peripherals.

New EMARMOUR™ 2 Channel High-Speed Op Amp
ROHM introduces the availability of a 2 channel high-speed ground sense CMOS op amp, BD77502FVM, optimized for consumer and industrial equipment requiring high-speed sensing – such as industrial measurement and control systems.

New Automotive-Grade Buck-Boost Power Supply Chipset Ensures Stable Performance with Industry-Low* Current Consumption
Novel Quick Buck BoosterⓇ technology improves system stability in start-stop vehicle systems

electronica 2018 – ROHM presents advanced power and energy management technologies for higher power density, efficiency and reliability
VENTURI Formula E Team with new driver Felipe MASSA uses ROHM's Full SiC power module and Gate driver IC

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