Split 24 Vdc Input into Dual 12 Vdc Outputs: Power Divider Product Available?

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Discussion Overview

The discussion revolves around finding a product or method to split a 24 Vdc input into two 12 Vdc outputs, each capable of supplying 3 Amps. Participants explore potential solutions, including commercial products and DIY approaches, while considering efficiency and noise factors.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about existing products to split a 24 Vdc input into two 12 Vdc outputs.
  • Another suggests using two 12V linear regulators, but notes potential inefficiency due to heat dissipation.
  • A participant emphasizes the inefficiency of linear regulators for this application and recommends considering switch-mode buck converters instead.
  • Concerns about noise from buck converters are raised, although it is noted that many applications requiring 3A may not be sensitive to this issue.
  • A participant expresses uncertainty about their specific needs and seeks further clarification on the requirements for their robotics project.
  • Links to specific buck converter products are shared, including one that is noted for its efficiency.
  • A follow-up indicates that while one suggested product has a single output, another product meets the dual output requirement.

Areas of Agreement / Disagreement

Participants generally agree on the inefficiency of linear regulators for this application and the potential advantages of switch-mode converters. However, there is no consensus on the best approach or product, as various options and considerations are discussed.

Contextual Notes

Participants express varying levels of familiarity with the topic, leading to different assumptions about requirements and constraints. Specific needs such as ripple tolerance and noise sensitivity remain unclear.

Who May Find This Useful

This discussion may be useful for individuals working on robotics projects or those needing to manage power distribution in electronic applications, particularly where voltage conversion is required.

DC1101
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I'm a newbie and I apologize for not conducting a thorough search of the site before posting.

I need to know if there is a product available that will "split" input of 24 Vdc/6.25 Amps into two (2) outputs of 12 Vdc/3 Amps each. Anyone here know of such a thing or am I better off building something myself?

Thanks!
 
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i was going to suggest DC-DC converter but i don't think they have any like that. How about just 2 12V linear regulator

http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=2556290;keywords=12v%20regulator

filter the search for 3A output. You can just use a TO type package or could go smd getting D2PAK
 
Linear regulators are going to be very inefficient if they have to drop 12V and source 3A. They will dissipate a very large amount of heat.

Look into switch-mode buck converters instead.

- Warren
 
chroot said:
Linear regulators are going to be very inefficient if they have to drop 12V and source 3A. They will dissipate a very large amount of heat.

Look into switch-mode buck converters instead.

- Warren

i guess yeah 3A and 12V drop does seem a lot. buck converter is going to be noisy though but would be more efficient.
 
Most applications that demand 3A of current are not particularly sensitive to noise. DC1101, you might want to tell us more about your needs -- ripple tolerance, etc.

- Warren
 
Not really sure of my needs - I'm a bit (understatement) out of my realm here. The robotics project is limited to one power source of 24Vdc/6.25A - I just had an idea of splitting the source evenly and powering two units instead of one. I've tried searching but I'm not really sure of what it is I am looking for and I simply cannot phrase it correctly to make google happy. All input GREATLY appreciated!
 
here's a buck converter
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=AP1501-12K5LDICT-ND
 
Most semiconductor companies that make power products should have something reasonably appropriate. Do a parametric search on their websites. Here's one from National that's 90% efficient:

http://www.national.com/pf//LM/LM25576.html

- Warren
 
Last edited by a moderator:
Thanks for the info, Warren - you got me going in the right direction. The LM25576 only has a single output - the LM5642 has the dual output I require. Thanks again!
 

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