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DC- DC stepdown modules
DC- DC stepdown modules
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Old 4th January 2018, 07:48 AM   #1
Puffin is offline Puffin  United Kingdom
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Default DC- DC stepdown modules

I am looking to use a stepdown module to reduce voltage by around 5v on a linear PS so that I can use it with other amp modules.

There are many you can buy and I need some help working out which ones would be suitable.

There are links to two below. Can anyone tell me if there are any real differences between them or are these others that people have used that I should consider.

DC-DC Step Up Down Boost Buck Voltage Converter Module CC/CV LM2577S LM2596S | eBay

XL4005 5A DC-DC Voltage Step Down Buck Converter Constant Current 5-32v, UK Fast | eBay
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Old 4th January 2018, 10:08 AM   #2
Puffin is offline Puffin  United Kingdom
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It might help if I add that the supply in question is giving 24 - 25vdc and I need to get it down to 19v at 4.5A.
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Old 4th January 2018, 10:55 AM   #3
globalplayer is offline globalplayer  Germany
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1st one: max. 3 A.
2nd one: probably max. only 4 A.

I would look for more capable devices so there will be not that much strain on the components and they might survive longer.
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Old 4th January 2018, 01:02 PM   #4
Puffin is offline Puffin  United Kingdom
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Quote:
Originally Posted by globalplayer View Post

I would look for more capable devices so there will be not that much strain on the components and they might survive longer.
I have never used any of these things before and don't know which IC's are better than others, or which circuits put strain on the components. I guess I will just have to take a punt.
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Old 4th January 2018, 02:28 PM   #5
kodabmx is offline kodabmx  Canada
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This one would suit better, and it's cheaper.


DC-DC CC CV Buck Converter Step-down Power Module 7-32V to 0.8-28V 12A 300W N6W4 | eBay
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Old 4th January 2018, 02:54 PM   #6
Puffin is offline Puffin  United Kingdom
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I have just been looking at that one! Thanks.
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Old 4th January 2018, 06:21 PM   #7
russc is offline russc  England
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For 19V at high current you could pick up a pre-loved laptop supply on Ebay (or you might already have a few already?).
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Old 4th January 2018, 06:44 PM   #8
Puffin is offline Puffin  United Kingdom
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Yes, I have one, but I need two for a dual mono design. I thought that perhaps a linear supply might do better than an SMPS.
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Old 4th January 2018, 10:14 PM   #9
trobbins is offline trobbins  Australia
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Puffin, can you elaborate a bit more on your powering scheme target. Things are a bit vague, such as:

Do you already have a 24-25VDC linear PS? What is the measured output current range and voltage regulation over that current range (including ripple - ie. the maximum peak and minimum minima of the supply voltage waveform)?

Are you going to connect two dc/dc to that linear PS - one dc/dc each for two mono amp supplies?

What is the voltage input range of your amps?

That converter will have some limitation on how close the output voltage can get to the input voltage for its operating frequency and component selections, and if part temperatures remain ok. That would require some verification testing by you to ensure you have sufficient operating margin before regulation or control is lost.

Your two amps will share a common 0V power supply rail, and may finally end up with ground loops if not done with some care.
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