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Old 05-28-11, 12:07 PM   #1
fabieville
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Default looking for a dc-dc stepdown/buck circuit with high current output

I am looking for a dc-dc stepdown/buck circuit that can handle up to 60VDC max input with an adjustable output or a fixed output of 14VDC and have output current up to 8amp or greater.

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Old 05-28-11, 02:19 PM   #2
Xringer
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Buy eight LM317HV ($3 each) chips and put them in parallel.?.



LM317HV - 3-Terminal Adjustable Regulator

Make them all adjustable, so you could carefully set each one to 14.00 volts.

Here's a data sheet..
http://www.national.com/ds/LM/LM117.pdf
page 22 shows a few stacked together..
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Old 05-28-11, 11:49 PM   #3
fabieville
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Could i build a buck step down circuit using LM317 or anyone of those adjustable regulators? I am wondering if it would work like how a conventional buck circuit operates. I am planning to use Lm317HV which can take in a very high input and use some lm317HV in parrallel to gain more current output along with a good size inductor in the circuit. So would it work like how a buck circuit operates?

I am trying to acheive more current at the output than what is coming in after the input voltage has been step down. Like how mppt works converting that excess voltage to current. So for eg. if i have 30VDC at 3 amp at the input after stepping down to 14VDC will i have more current at the output maybe twice the amount? Will that be the case?
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Old 05-31-11, 08:55 PM   #4
mejunkhound
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more current at the output than what is coming in

was going to suggest the national semiconductor "simple switcher" till you mentioned the 'more current'.

Depending on your electronic capabilities, to get more current you will need to use a step down xfmr and a pwm chip like the UC1846 and a push pull or forward converter topology.

You can get a little more current out than in on a near classical buck circuit if the input voltage is lots higher and you put a big capacitor at the input, but nothing like doubling the current.
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Old 06-03-11, 01:15 PM   #5
cbarbie
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Default DC-DC converters

Have you tried looking at a solar charge controller that has a stepdown function?
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Old 06-03-11, 01:19 PM   #6
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Here is a list of some DC-DC converters that are available:

DC%20to%20DC%20Voltage%20Converters%20-%20DIY%20Solar%20Panels%20&%20Renewable%20Energy%2 0@%20AltE%20Store]DC to DC Voltage Converters - DIY Solar Panels & Renewable Energy @ AltE Store

It looks like there may be a couple that might fit your needs.


If not, here is a list of solar charge controllers and some of them have a stepdown function.

MPPT charge controllers for solar panels systems @ AltE Store


I am not pitching this vendor, they just have a large selection.

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