Approvedformedicalapplications For more information email: firstname.lastname@example.org
So what makes these new 3” x 5”
AC-DC power supplies so cool?
The simple answer is – very smart thermal management.
...and what could this mean for your application?
• No fans
• No fan controllers
• Lower noise
• 94% efficiency
• Increased reliability
fans to be cool?
• Comply with UL60601-1 3rd edition
medical safety standard
• Input voltage range 90-264VAC
...with active inrush protection
• 12, 24 & 50VDC output options
• 12 VDC 1A fan supply and auxiliary
5VDC 2A output provided
hance the driving experience, they seek better graphics process-
ing performance from IC vendors. Graphics processors are usually
embedded within the applications processors employed in HUDs.
IC vendors are taking their cue from consumer devices, where the
portion of the chips going into smart phones dedicated to graphics is growing. “Graphics technology is going to drive all of these
processes that will be projected in front of the driver,” says Dan
Loop, Automotive Business Development Manager at Freescale
Semiconductor. The company’s i.MX processor family is positioned for the graphics needs of next-generation HUDs because
of the scalability of the CPU, as well as the graphics processing
capabilities of the products to accommodate different vehicle
platforms with varying quantities of display outputs. “It’s really
a pixel-bound equation that will dictate what resolutions those
displays can be, and how we can process all that information in
parallel to render multiple pieces of content on multiple displays
at the same time,” he says.
Project the right chips for wider, brighter HUDs
One thing designers can count on with automotive HUDs is
change. Loop suggests that as the HUD market continues to grow
and resolutions get larger, developers should question customer
requirements. “We see things changing dramatically — so the
ability to take the processor out and just do a simple replacement
to a pin compatible high performance part is a huge value proposition,” he says.
As more information becomes available to the driver, augmented
reality technology, along with the availability of DLP projection
technology, will help provide a wider FOV for the driver — perhaps as much as 10 or 12 degrees versus the four- or five-degree
FOV typical in today’s HUDs — as well as a farther projection distance for the driver. First, the designer must consider an applications processor with the graphics processing capabilities that can
meet warping requirements to make the correct projection onto
the windshield of a given system, and to adjust to the different
shapes and styles of windshields.
Brightness is also critical if more information is to be presented
in the driver’s line of sight. The amount of light the driver receives
from the HUD must not compete with or against ambient light.
Dickhart sees a 5000:1 dynamic range of brightness required in order
to achieve a maximum of 15,000 cd/m2 of brightness during the day,
and 3 cd/m2 at night for HUD applications. That means selecting
optimal LED drivers and operational amplifiers, among other chips.
Dickhart says, “In the DLP HUD solution, we actually have a TI
Piccolo MCU that handles the pulse width modulation of the LEDs to
ensure that dimming is well controlled and happens very smoothly
so that the driver gets the appropriate amount of light. ”
As processing power increases to allow for even more information
to reside in the driver’s line of sight, designers must continually fac-
tor in brightness, distance, field of view and cost to deliver informa-
tion safely and efficiently to the windshield, and even to overlay that
information onto the road and actual objects. ECN