16 November 2011

LEDs and drivers for automotive display backlighting

ROHM Semiconductor has unveiled its new high power, high brightness white chip led SMLx family with reflector (PLCC2 & high heat radiation packages) for automotive backlighting applications.

According to ROHM, the devices address the need for increased functionality of clusters, car audio and navigation, climate control, switches and lcd/tft backlighting.

The SMLZ1xx, SMLKxx,SMLVxx and SMLXAxx led family are available in range of top and side view package types, forward currents as well as luminous intensity (mcd). The emitted colours are cold white and warm white. Additionally, the leds offer high heat radiation for operation at high temperature, maintenance of high power at high currents and what ROHM describes as 'superior device reliability and durability'.

With the development of its new BD81A04 LED driver series, ROHM says it is able to provide a complete design solution for display backlighting. The new IC is a four channel 120mA/ch led driver with an integrated buck boost dc/dc constant current driver which can be used to drive various leds for backlighting of displays or head up displays. Due to its topology it only requires one coil for buck boost configuration and is said to provide stable operation over a wide voltage range. The BD81A04 integrates mosfets like the PWM current driver or the boost FET.

The advanced brightness control /dimming functions and the flexibility to combine fewer channels with higher output current round up the features of this device. For example, instead of using four channels with 120mA, it's now possible to achieve 240mA via two channels. Protection functions such as monitoring voltage, current, temperature and short circuit detection are also implemented.

LED SMLx family samples and volume production are currently available, as are samples of the BD81A04 led driver with volume production starting in Q2 2012.

Chris Shaw

Supporting Information


Rohm (Great Britain) Ltd

This material is protected by Findlay Media copyright
See Terms and Conditions.
One-off usage is permitted but bulk copying is not.
For multiple copies contact the sales team.

Do you have any comments about this article?

Add your comments


Your comments/feedback may be edited prior to publishing. Not all entries will be published.
Please view our Terms and Conditions before leaving a comment.

Related Articles

€55m power electronics project

Described as one of the most important European energy efficiency research ...

Converters cut space by 50%

The MTU2 series of surface mounted 2W DC/DC converters is claimed to be 50% ...

Intersil targets power lead

Intersil has announced plans to use its technology portfolio and track record ...

A/D converters get it right

Successive approximation A/D converters, with resolutions of up to 18bit and ...

DC transmission on a comeback

The pressure throughout the energy supply chain to deliver electrical power ...

Power design survey results

A power design survey conducted by New Electronics threw up some interesting ...

Power electronics in EVs

This whitepaper presents a review of power electronics systems in electric ...

Power management ics

This whjitepaper presents various application scenarios where high voltage ...

Power saving techniques

Wireless telecommunications has given rise to a host of new portable ...

6W DC/DC converters

XP Power has announced the ITX series of 6W DC/DC converters. Available in an ...

Low voltage power supplies

TDK has added 12 and 15V models to its ZWS300BAF series of single output power ...

1W DC/DC converters

Murata has announced the NCS1 family of single output, 1W DC/DC converters.

PCIM Europe 2014 Conference

20th – 22nd May 2014, Nuremburg, Germany

BEEAs 2013

9th October 2014, 8 Northumberland, London

Engineering Design Show 2014

22nd-23rd October 2014, Jaguar Exhibition Hall, Ricoh Arena, Coventry, UK


In this video product marketing engineer, Rich Nowakowski, discusses a family ...

TI power design tools

Discover and get to market faster with TI Power Design Tools; easy-to-use ...

3E EPM Hands on Digital Power

Introduced by Ericsson in 2008, 3E* digital power products and solutions became ...

Packing a powerful punch

Power is back when it comes to industrial system performance and efficiency. ...

Powering ahead

Too often in the past, electronics industry initiatives have been announced ...

Richard Noble's Bloodhound Project diary

Late again – but it's the end of the year and we are going strong! The sheer ...

Roger Rogowski, UKEA

Last week's Anti Counterfeiting Forum saw electronics industry leaders convene ...

Patrick Le Fèvre, Ericsson

Patrick Le Fèvre, marketing director, Ericsson Power Modules, talks with Chris ...

Andy Gales, vp, Vicor

Andy Gales, vice president, international sales, Vicor, talks with Chris Shaw