My Converter Dilemma (Pi-Head)

What converter would you choose?

  • Flexible - 2.4 to 9v Battery range - 70~75% efficient

    Votes: 13 27.7%
  • Efficient - 1.8 to 5.5v Battery range - 90~95% efficient

    Votes: 32 68.1%
  • I want a pizza and be able to add 5 toppings

    Votes: 4 8.5%

  • Total voters
    47

PEU

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I scrapped the idea of making a LDO converter time ago, for the solution everyone prefers, a switched driver.
I found two candidates each one with its pro and cons. I need some feedback to help me decide what feature is the most desirable.

Both drivers are current regulated.

Converter 1 is Flexible:
It can accept any battery configuration from 2.4v to 9v and its efficiency is in average 70~75%

Converter 2 is Efficient:
It can accept any battery configuration from 1.8v to 5.5v and its efficiency is in average 90~95%

What would you choose?

Thanks


Pablo
 
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jtice

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I picked #1,
based on the fact that I only use Li-Ion cells.
and that would run off one well, as well as two.

The other one would only run on a single cell, and then going down all the way to 1.8V would be useless for a li-ion.

~John
 

tibim

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I chose flexible but it's a hard question. Depends on the light.

Only picked this because I like lights that are 2xcr123a format, and the efficient wouldn't support that.

But if I was looking for a single cell light, I'd go with "efficient".

-tibim
 

Sable

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I went with option 2. I'd love to run the light on 1x18650, which seems to be just "the business" these days. Also, the idea of burning 25% of my energy as heat before it hits the LED makes me think "Isn't this why I switched away from incans in the first place...?"


But I'll take some of that pizza, if you're offering.
 

PEU

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Yep, cost is about the same, one important fact is that the pineapple is a 2x123 body, so if I go the efficient way it would rule out the natural combination: 2x123 primaries


Pablo
 

TorchBoy

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That does rather make your choice for you, Pablo. I voted for option 2 because I'm thinking selfishly, running an LED off four NiMH AA cells.
 

jch79

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PEU said:
Yep, cost is about the same, one important fact is that the pineapple is a 2x123 body, so if I go the efficient way it would rule out the natural combination: 2x123 primaries
That's not my natural combination!! A 2x123 tube, to me, usually means a 1x17670 or 1x18650 tube. :shrug: :)

john
 

WAVE_PARTICLE

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I'm a single Li-ion type of guy myself as well.

1x17670 or 1x18650

I go for efficiency....the 20% difference is material and will be noticeable....IMHO.

WP
 

Nebula

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Pablo - I too prefer the single Li-ion option, so I am with jtice et al. KK

EDIT: This post does not accurately reflect my position. Sorry, it was late. What I meant to say is that I prefer option #1.
 
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jch79

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Nebula said:
Pablo - I too prefer the single Li-ion option, so I am with jtice et al. KK
If you prefer a single Li-Ion, then you aren't with jtice! (Sorry John!) He wants it to be able to handle 2 Li-Ions, which would be require option 1.
 

Hallis

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jtice said:
I picked #1,
based on the fact that I only use Li-Ion cells.
and that would run off one well, as well as two.

The other one would only run on a single cell, and then going down all the way to 1.8V would be useless for a li-ion.

~John


I picked the same for the same reason.

But I want a 5-topping pizza too damnit!!! ;)
 

Action

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What we really want is option #2 with a drive range of 3V-8V and pizza.
 

65535

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So PEU wheres my pizza? As for converters, you might try to up the range say, 3-7 volt range, just curious are you using a linear regulator? and you have to choose which one will be the most efficient?
 

PEU

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65535 said:
So PEU wheres my pizza? As for converters, you might try to up the range say, 3-7 volt range, just curious are you using a linear regulator? and you have to choose which one will be the most efficient?

My choices are:

TPS63000 (Efficient)
LT3477 (Flexible)

If you find something better Im all ears :)


Pablo
 

Nebula

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jch79 - I take your point, but still vote with John. Like John, I want to use Li-ion cells exclusively. That makes #1 the more appropriate option for my needs.

Sorry if my orignal post was confusing. I will edit.

Kirk

jch79 said:
If you prefer a single Li-Ion, then you aren't with jtice! (Sorry John!) He wants it to be able to handle 2 Li-Ions, which would be require option 1.
 
Last edited:

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