The only thing with the ptn04050 is mininum output voltage 5v (4.5 under load) which makes it not-so-good for my purposes since I still have low res dual coils and such.. but even so with that chip (or probably any) vaping dual coils on it without an imr battery it would "scream" at me (high pitch buzz)
LM2577 Fail
- Thread starter Dougiestyle
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Dougie, the LM2596 modules on eBay are the same (very similar size) as the LM2577 module. The LM2596 are step-down converters. One of the mods on my list to make is a LM2596 module with 2 18350 batteries in a RadioShack 3x2x1 box. This box is a nice size and I think I can fit everything in there; that is if I don't goober it all up 
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ETA: Right now I'm using 2 14500 Trustfires to run a LM2596 and getting all day run time.
Check out jhonutz's thread - http://www.e-cigarette-forum.com/forum/battery-mods/239610-my-newest-mod-box-vv.html. Towards the end he shows his new copper tube boost mod. He found another converter to use; that is if you have a steady hand and really good eyes
.ETA: Right now I'm using 2 14500 Trustfires to run a LM2596 and getting all day run time.
Check out jhonutz's thread - http://www.e-cigarette-forum.com/forum/battery-mods/239610-my-newest-mod-box-vv.html. Towards the end he shows his new copper tube boost mod. He found another converter to use; that is if you have a steady hand and really good eyes
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Steady hands, but only 1eye works (long story) lol.that is if you have a steady hand and really good eyes
I had the LM2596 bookmarked, too. Coupla questions about it tho...
How much mAh do your 14500s hold and what voltage/resistance are you vaping all day? I want an sure-fire all-day PV with voltage up to 5v on coils with 2ohm at the high-side. I basically want a cigarette-pack sized box that will give rediculous amounts of power.
Am I asking too much lol?
The 14500s are listed as 900 mah; the trustfire 18350s are 1200 mah. I don't vape at those watts 
. I'm usually in the 6-8 watt range.
What I've done with my ACDC mod is (well, copy from BJ43) make it switchable from batts to an AC adapter PT power supplythumbs: BJ). So if I'm at my desk (or even in the car) I usually plug it in, saves batt life. The AC adapter I use is 12v/2a; BJ uses a 12v/5a adapter- plenty of power there!
The eBay sellers claim the LM2596 modules will operate at 3a max; so if you have some IMR batts, I would think what you are looking for is doable.
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. I'm usually in the 6-8 watt range.What I've done with my ACDC mod is (well, copy from BJ43) make it switchable from batts to an AC adapter PT power supply
thumbs: BJ). So if I'm at my desk (or even in the car) I usually plug it in, saves batt life. The AC adapter I use is 12v/2a; BJ uses a 12v/5a adapter- plenty of power there!The eBay sellers claim the LM2596 modules will operate at 3a max; so if you have some IMR batts, I would think what you are looking for is doable.
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Well the moral of the story is to use a breadboard, and that's after doing a little research.
Even on eBay, some merchants provide more specific details about these LM2577 boost assemblies.
Another.
Of the eBay ones this one seems the most promising.
DC-DC Buck-Boost Converter 3-35V to 1.2-30V Module 2A | eBay
It's based on this chip.
http://www.ti.com/lit/ds/symlink/lm2587.pdf
Here's a 900mAh UF14500 tested at a rather light .8A drain,
Actual 592mAh. The TF Flames should be be a bit more.
Here's another test. UF18350's and AW123's (16340).
So the UF18350's are about ~800mAh.
When stacking cells there is absolutely no advantage to using IMRs, and in the 18650 class all you are doing is cutting your runtimes.
An older test at a 2A drain.
If you judge at the 3V mark you'll note the AW2600 Li-Ion is getting to ~2600 while the IMR a measly ~1500mAh. That's about 60% more mAh for the Li-Ion.
Even on eBay, some merchants provide more specific details about these LM2577 boost assemblies.
Another.
Of the eBay ones this one seems the most promising.
DC-DC Buck-Boost Converter 3-35V to 1.2-30V Module 2A | eBay
It's based on this chip.
http://www.ti.com/lit/ds/symlink/lm2587.pdf
Well what are they really.
Here's a 900mAh UF14500 tested at a rather light .8A drain,
Actual 592mAh. The TF Flames should be be a bit more.
Here's another test. UF18350's and AW123's (16340).
So the UF18350's are about ~800mAh.
When stacking cells there is absolutely no advantage to using IMRs, and in the 18650 class all you are doing is cutting your runtimes.
An older test at a 2A drain.
If you judge at the 3V mark you'll note the AW2600 Li-Ion is getting to ~2600 while the IMR a measly ~1500mAh. That's about 60% more mAh for the Li-Ion.
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The 14500s are listed as 900 mah; the trustfire 18350s are 1200 mah. I don't vape at those watts
I've not seen a battery company that doesn't lie about it's mah rating....some worse than others. I saw some 10440's listed as 880mah; no possible way that's correct...
I'm saving WB's chart he posted; good info right there
Yeah Willy, some of the LM2596s are set up for low amp output; others say typical 2a with a max of 3a; which is what the datasheet says for the LM2576.
Just as a general heads up, it's always a good idea to read the item details for any eBay listing.
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Just as a general heads up, it's always a good idea to read the item details for any eBay listing.
Sent from my iPod touch using Tapatalk
Try a 2C cell size box from MV, a SWADJ 3 chip and 2 26500's with side mounted switch. You have to mod the box a bit and the only 26500's I could find were AW IMR's so I use magnet spacers. The box is a little thicker than a pack of cigs but close.
I understand about the reg being expensive but I only had to solder the switch to VIN, the att and batt neg to GND and the the Atty pos to VOUT. Nice! One year replacement warranty, pro rated after that. Around $60 including batteries. Works great!
Robert
The ultrafire 3000mah 18650's are crap! Before I even saw that graph I could have told u how much the voltage drops off almost right away. I get more usable life outta aw imr 18650's any day. Off of my 18490's in my vv box I've been vaping heavily at 5 volts (2.5ohm dual coil) and by the end of the night each batt has been reading 3.8v which still has some decent life to it I'd say. U can't go wrong with li-mn batteries either, all lithium ions are not created equal.
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