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PDF EL640.480-AM1 Data sheet ( Hoja de datos )
| Número de pieza | EL640.480-AM1 | |
| Descripción | Displays | |
| Fabricantes | Planar Systems | |
| Logotipo |  |
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Interfacing the Planar Systems
EL640.480-AF1, AG1 and AM1 Displays
EL640.480
Application Note 116-01
Copyright© 1996 by Planar Systems, Inc.
This document is subject to change without
notice. Planar provides this information as
reference only and does not imply any
recommendation or endorsement of other vendors
products
AN116-01 December 1996.
The Definition of Quality
Free Datasheet http://www.datasheet4u.com/
1 page  
Another factor affecting total power draw is the scan rate at which the display is
refreshed. The ICEBrite displays are specified to run between 60 and 120 Hz.
After a certain overhead, power consumption will roughly double when doubling
the scan rate. So, for the 10.4" ICEBrite display, maximum power is 24W at 120
Hz. If we assume overhead is about 4W and subtract this out, the power
consumption is 20W at 120 Hz which would scale down to 10W at 60 Hz. After
adding the overhead back in, the total power estimate is 10W + 4W = 14W at 60
Hz. In this way, a system designer has flexibility to balance total brightness,
which increases linearly with scan rate as well, and total power.
The power is not distributed evenly between the +5 V supply and the +12 V
supply. Since the +5 V supply is used in the digital logic only, the total power
consumption of this supply is specified as a maximum of 500mW. The
remainder of the power is on the +12 V line for the DC-DC converter. Care
should be taken to insure the current carrying capability of the +12 V supply and
PCB traces/connector/cable is adequate for the expected current draw of the
ICEBrite display. Typical and maximum current draw can be found in the
ICEBrite specification.
Once the system can supply the current required, the next step is to insure that
the system cannot supply too much current if there is a malfunction. Typical
concerns can be anything from a screwdriver dropped on the display, thus
shorting out components, to a massive voltage spike that destroys the DC-DC
converter. Planar suggests some type of overcurrent limit protection on at least
the +12 V input, and preferably both, either by fuse or current limiting circuit. If
by fuse, a general guideline is to rate the fuse at 1.8 to 2x the display maximum
current rating with a medium to fast acting fuse.
Another item that should be addressed is the possible current spikes in the +12 V
supply causing conducted EMI concerns. The DC-DC converter on the ICEBrite
displays typically incorporate some type of switching regulator that runs about
100 kHz which can add current spikes to the system +12 V rail. Often, a ferrite
bead, or choke can be added in series with the +12 V supply to minimize this
affect. This can also help power supply regulation which is important to insure
the proper operation of the display.
Like LCDs, proper power supply sequencing is important to insure the display is
not damaged. However, the EL power supply sequencing requirements are much
simpler to implement. In general, the only requirement is that the +5 V supply
must be present whenever the +12 V supply is applied. In practice, ICEBrite EL
displays have been designed to allow simultaneous application of both +12 V
and +5 V as long as +5 V is present by the time the +12 V line reaches +12 V.
Planar Application Note 116-001 #
Free Datasheet http://www.datasheet4u.com/
5 Page 
Contact Information
Planar provides this information as a reference only, and does not imply any
recommendation or endorsement of the products.
Chips and Technologies, Inc.
2950 Zanker Road
San Jose, California 95134
Voice: 408-434-0600
FAX: 408-526-2275
Alpha Point, Ltd.
Hämeentie 81-83
FIN-00550 Helsinki
Phone: +358-0-738 295
Fax: +356-0-719 008
Cirrus Logic, Inc.
3100 West Warren Ave.
Fremont, California 94538
Voice: 510-623-8300
FAX: 510-226-2160
Allus Technology Corporation
12611 Jones Road
Houston, Texas 77070
Voice: 713-894-4455
FAX: 713-894-6709
S-MOS Systems, Inc.
2450 North First Street
San Jose, California 95131
Voice: 408-922-0200
FAX: 408-922-0238
Ampro Computers, Inc.
990 Almanor Avenue
Sunnyvale, California 94086
Voice: 408-522-2100
FAX: 408-720-1305
Teknor MicroSystems, Inc.
616, rué Cure Boivin
Boisbriand (Québec),
Canada J7G-2A7
Voice: 514-437-5682
FAX: 514-437-8053
Octagon Systems
6510 W. 91st Avenue
Westminster, Colorado 80030
Voice: 303-430-1500
FAX: 303-426-8126
Planar Application Note 116-001
Free Datasheet http://www.datasheet4u.com/
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