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 Power backlight inverter directly from battery?
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Posted - 04 Dec 2002 :  17:24:27  Show Profile  Email Poster
I'd like to power the backlight in my system directly from a battery. Do you have any recommendations for inverters that work over the range of 5 to 9 V?


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Posted - 06 Dec 2002 :  17:56:37  Show Profile  Email Poster
Most backlight inverters are designed for 12VDC inputs. Some work with 5V, but I don't know of any that work with the range you need in your application (some publish 0-15V ranges, but brightness varies in proportion to the input voltage). Here are a couple solutions:

5V Backlight Inverters

If you use a DC-to-DC converter to power the backlight inverter, you could use any one of the following 5V backlight inverters (these would work for the 6.4-inch LQ64D343 display we currently use with our systems):
  • Taiyo Yuden (formerly Xentek) LS655; has different input connector than ADS boards

  • Linfinity LXM1622-05-01; uses 8-pin Molex input connector, different from ADS

  • ERG E1957: not dimmable

  • You can get datasheets for these at the manufacturer sites listed at this topic. If power consumption on your system is an issue, make sure that you use a very high efficiency converter.

    12V Battery and Inverter

    Another approach is to use a 12V battery. Many of the 12V inverters have a wider input voltage range (either 10 or 20% tolerance) than the 5V inverters (usually 5% input tolerance). This would allow direct connection to most 12V battery types.

    Drew Kidder
    ADS Technology Transfer
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