Welcome, Guest
Username: Password: Secret Key Remember me
  • Page:
  • 1
  • 2

TOPIC: A Look at Switching DC-DC Converters

Re: A Look at Switching DC-DC Converters 6 years 1 month ago #13386

  • Baldor
  • Baldor's Avatar
  • Offline
  • Expert Boarder
  • Posts: 135
  • Thanks received: 91
Seems like what i was thinkiing. Now, the final decision is only constrained by the space available. A 2AA batery holder is biger than a 9V batery with the conector (The 9V is about 50mm long with the conector, ideal for a case apropiate for a 50x50mm board). If the aplication is not space constrained, go with the 2AA and boost.

Also, the 9V batery will not fully discharge to the 4.8V shown in the table with a buck converter, it will stop working somwere a litle over 5V, while the AAs with a boost will fully discharge to 0.8V.

So... I need to look furter for a case suitable for my next project. (IR barrier camera trigger, PIC12F508 for the receiver and a PIC10 for the transmiter, batery operated, and long batery life needed)
Aprendiz de mucho, maestro de casi nada.

Re: A Look at Switching DC-DC Converters 6 years 1 month ago #13387

  • Jon Chandler
  • Jon Chandler's Avatar
  • Offline
  • Moderator
  • Posts: 365
  • Thanks received: 352
True, AA batteries are slighly longer Han 9-volt batteries but if you add a snap connector they are pretty close to the same length. Many of the enclosures I've seen with battery compartments say they fit either.

A AAA cell is smaller than a 9-volt and a pair would provide about 4x the capacity of a 9-volt.
The following user(s) said Thank You: Baldor

Re: A Look at Switching DC-DC Converters 6 years 1 month ago #13388

  • Baldor
  • Baldor's Avatar
  • Offline
  • Expert Boarder
  • Posts: 135
  • Thanks received: 91
The problem is not the size of the batery itself, but the batery holder, and AA batery holders are longer than 9V with the conector.

I've been brosing enclosures with batery holder at farnell, and nothing fits my needs, (Usually, too expensive) so I decided for a simple box that could fit the 50x50mm board, the dc-dc converter, and the bateries. Time to recheck to make room for a 2AA batery holder.
Aprendiz de mucho, maestro de casi nada.

Re: A Look at Switching DC-DC Converters 6 years 1 month ago #13389

  • Baldor
  • Baldor's Avatar
  • Offline
  • Expert Boarder
  • Posts: 135
  • Thanks received: 91
What about this: http://www.ebay.es/itm/DC-DC-Boost-Conv ... eff&_uhb=1 ?

Seems idealy suited for operating with 2AA bateries. Other boost converters I have seen in ebay operates from 3V. This, operates from 1 to 5V, and the output is fixed at 5V. (500mA max, enough for my aplication)
Aprendiz de mucho, maestro de casi nada.

Re: A Look at Switching DC-DC Converters 6 years 1 month ago #36

  • Jon Chandler
  • Jon Chandler's Avatar
  • Offline
  • Moderator
  • Posts: 365
  • Thanks received: 352
Looks like that would do the job and be able to suck everything out of two or three AA batteries. You sure couldn't build it yourself for that price!

There's not much information in the eBay ad to guess what the efficiency might be but at the price, looks like it's worth trying it out.
  • Page:
  • 1
  • 2
Time to create page: 0.235 seconds