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  • Pumps out 1.1A! Very bright but only 80% efficient

    posted by desolder on 01/14/2010
    1

    Involvement:Expert (understands the inner workings) - Ownership:more than 1 month

    Pros:

    This driver is pumping out 1.1A on high, so it's good for maximizing the brightness of single die LED's like the P4 and XRE/XPG. I am using it with 4AA, and the regulation is ruler flat from 6V to 4V.
    Cheep cheep driver... under $3... gotta love that.
    Be careful which SKU you order. There are four versions of this driver, the only difference is the UI: 3 or 5 modes, with and without memory. Choice is always good.
    I prefer drivers with only a few modes, and no memory, so I really want to like this driver but...

    Cons:

    The measured efficiency is only 80%. This is pretty low for a buck regulator. The Zetex based driver (sku.3256) is 95% efficient, however it is only one mode. The only other multi-mode driver suitable for 4 to 6 AA is sku.7425, and that only pumps out 800ma and is only slightly more efficient at 85%.
    For comparison, a linear mode driver which simply burns off excess voltage as heat (e.g. AMC7135 based sku.6190) will average about 75% efficiency with 4 NIMH AA's (drops 4.8V to 3.6V at 1A)

    OtherThoughts:

    I separated the two boards and the main IC is marked "LEDA 0712". Switching is handled by a separate N-FET marked "A06". The sense resistor is 0.25 ohms. The inductor is marked "100" - I believe that means 10uH.

    Bottomline:

    Overall it's a good driver. Get a few for your 4-6 NiMH or 2 Li-ion powered projects.

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