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Thread: My new Sproggy style power supply

  1. #1
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    Post My new Sproggy style power supply

    Hey'yall. Since I've seen a lot of talk about how people think the v2.5 or v2.6 power supply from Sproggy wouldn't be powerful enough, I've taken the liberty of creating two new versions, the v2.7 and v2.7.2... Check them out at my website in my sig... Any suggestions / comments / ideas would be greatly appreciated. I'm just in the process of gathering parts now for it, so I haven't tried it out yet, but it can provide up to 65W on the +5V line, and 32W on the +3.3V line. We're assuming only 1.26A (15W) on the +12V line, but we don't actually have any specs from coilcraft about that. So this gives basically 100W maximum, rated at 77W sustained, but with a big heatsink you can probably get away with closer to the 100W.

    I have received free samples from National Semiconductor who fedexed them to me "priority next day morning" shipment... wow!!

    I have also received my free samples from Maxim (took about a week), however coilcraft wants me to pay $5 each for the parts I requested. Oh well.

    In any case, check it out.

    [ 11-15-2001: Message edited by: Telek ]
    IN DEVELOPMENT -- '96 Mustang, lilliput with PII/450 laptop, custom DC-DC power supply, 60GB; Garmin GPS; 802.11g; compact keyboard, small graphical LCDs, OBDII.

  2. #2
    Maximum Bitrate Raas's Avatar
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    You can't pull 5A from a LM2587-12T with the T6 Coil, will give you max 1 -> 1.2A at 12v

    About ty-ing the outputs of the +5v regulators to eachother, I was going to do this myself, but I got warned by the eletronic gurus inhere. I really can't explain this myself, but maybe you could take a look at this thread which I posted after i had made a schematic... (or at least I thought I had made one )

    Greetz
    Raas - The Netherlands
    ME: VIA epia m10000, lilliput 7', opus 150w, 80gb<br>
    GF: IBM Thinkpad 380, ext. 3.5 80gb, 40x4, PB-IR

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    Well the original Sproggy supply had two of them tied together, so that's not a big deal. I know a bit about electronics, and I have spoken with a few of my electronics guru friends who said that the design is basically sound, the only thing that'll happen is that one regulator might get a bit hotter than the other, but with a bigass heatsink there's nothing to worry about.

    As for the 12V, I didn't know because I couldn't find any specs. Where did you get the specs for that? I know that we have found specs for a similar unit, but we're not certain for the coilcraft unit.

    What in your machine draws a lot of current off of the +12V? 1.26A doesn't seem like an aweful lot, considering how the power supply I have can give 8A I think.

    [ 11-15-2001: Message edited by: Telek ]
    IN DEVELOPMENT -- '96 Mustang, lilliput with PII/450 laptop, custom DC-DC power supply, 60GB; Garmin GPS; 802.11g; compact keyboard, small graphical LCDs, OBDII.

  4. #4
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    Spec Sheet for LM2587

    Yup, 1.2A off of the +12V and 0.3A off of the -12V

    And for anyone interested

    Code:
    40GB WD        5400RPM DRIVE:    7200RPM
                  +12v       +5v    +12v   +5v
    Spinup      : 0.8A max; 560 mA  1.8A  560mA
    Spinup (max): 1.1A max; 760 mA  (N/A)
    Read/Write  : 350 mA;   630 mA  (same)
    Seek        : 870 mA;   660 mA  (same)
    Idle    (E1H) 340 mA    610 mA  (same)
    Standby (E0H)  25 mA    190 mA  (same)
    Sleep   (E6H)  25 mA    100 mA 
    
    Operational : 5C to 55C
    Non-Operating Temperature -40C to 65C
    The really interesting thing is that the drive can take the +12V in ranging from 10.8V to 13.2V as it's tolerance (+12v +/- 10%). That makes it a bit easier as to what source you can get the power from.

    However the max spinup is nearly the max output of the power supply (read: yuk) however that's MAX max... still, that doesn't leave much room for anything else.

    Here's the really scary part:

    Component Design Life : 5 years
    IN DEVELOPMENT -- '96 Mustang, lilliput with PII/450 laptop, custom DC-DC power supply, 60GB; Garmin GPS; 802.11g; compact keyboard, small graphical LCDs, OBDII.

  5. #5
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    I'm making myself a Sproggy 2.7.3
    It'll have 2 12volt outputs, one for the Mobo and CDrom, and the other for the HD and fans..
    do I have to ask permission to make and sell these???

  6. #6
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    well, this is the circuit I came up with...
    Did I leave something out or connect it wrong???


    That extra bit of circuit in the air isn't any anything, and the grey line is a link..
    the white + on one of the tracks is the extra +12volts out...

  7. #7
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    skinny i was wondering why cant we use linear chips to make a power supply ?
    why do they have to be switching

  8. #8
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    Originally posted by mastero:
    <STRONG>skinny i was wondering why cant we use linear chips to make a power supply ?
    why do they have to be switching</STRONG>
    They get too hot, you probably could use then for 5volts, (although every one will argue) but for 12volts, the dropout is too low, they would probably only supply a well regulated 12volts while the engin was reving, not while it was idling.
    I started off using a 5volt regulator and transistor for the 5volts, it worked quite well, but I have now changed....

  9. #9
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    u again online !!

    ok ... so u saying that there is no way you can use a liner chip for 5 and 3.3 rail ?

    cause i have just come accross a chip by Lt and its cool chip give 5amps at 5vdc
    \has a 5- 25 input and i checked on the meter its 4.98 and when i start the car the volt drop is 4.97 and go back to 5.01

    so is that good or bad?

  10. #10
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    Originally posted by mastero:
    <STRONG>u again online !!

    ok ... so u saying that there is no way you can use a liner chip for 5 and 3.3 rail ?

    cause i have just come accross a chip by Lt and its cool chip give 5amps at 5vdc
    \has a 5- 25 input and i checked on the meter its 4.98 and when i start the car the volt drop is 4.97 and go back to 5.01

    so is that good or bad?</STRONG>
    No, you can use linear regulators for 5 and 3.3 volts, but there isn't really any advantage, and they run alot hotter...

    and...
    yeah, that should be fine, but is that with a load or not, if it isn't, you might have a problem...

    You really know how to move thing off topic don't you...

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