Automotive LED drivers for instrument cluster backlights

Rohm has developed four and six channel automotive LED drivers for 5 – 10in+ backlights behind displays and instrument clusters.

The parts (table below) include 20,000:1 PWM dimming and dc dimming in a way which “eliminates flickering when changing display brightness from low to high”, according to the company.

Switching can be between 200kHz and 2.4MHz, and operation is over -40 to +125°C)

Qualification is AEC-Q100.

Part	Input range	Channel count	Max drive mA/chan	Boost FET	Dimming		Package (mm)
Part	Input range	Channel count	Max drive mA/chan	Boost FET	1:20,000 PWM	dc	Package (mm)
BD83A04EFV-M	4.5 to 48V	4	120	Built-in	✓	✓	7.8 x 7.6 x 1 HTSSOP-B24
BD83A14EFV-M			150	External	✓	✓	7.8 x 7.6 x 1 HTSSOP-B24
BD83A14MUF-M under development			150	External	✓	✓	4 x 4 x 1 VQFN24FV4040
BD82A26MUF-M	3.0 to 48V	6	150	External	✓	✓	5 x 5 x 1 VQFN32FBV050

There are multiple development boards to go with the ICs: REFLED002, REFLED004, and REFLED003 (pictured) – the latter coming in two flavours depending on the built-in mosfet.

Product pages are not available at the time of writing.

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Steve Bush

Steve Bush is the long-standing technology editor for Electronics Weekly, covering electronics developments for more than 25 years. He has a particular interest in the Power and Embedded areas of the industry. He also writes for the Engineer In Wonderland blog, covering 3D printing, CNC machines and miscellaneous other engineering matters.