Ptn04050 testing- is this right

[inkjet21]

Ok i think i`m starting to get it with todays tests, the volts do drop when fired because of the addy/cart.so today i got out all my cartos and addys tested them all out and got a good range of ohms. all tests done twice, once with a 47 k res on the adj pin to get 5,28 volts and one with the adj pin open to get 4.67 volt both with diode in place.
___addy_______with 47k______with pin open
1) 1.6 ohm _____2.12________2.25___chip screamed at me both tests
2) 2.7 ohm _____2.9_________3.89___chip screamed a little with 47k res, not with open pin
3) 3.2 ohm_____3.17________3.92___ chip make i slight noise with res, hit good with open pin
4)3.9 ohm______4.32_______3.94____with res chip or batt cuts out in 1 sec, with open pin cuts out at 4 sec.
5) 5.0 ohm_____4.6________3.97_____with res chip or batt cuts out 1 sec, with open pin cuts out at 5 sec.

notice the volt drop gets less with the higher ohm addys. and when everything is just right it hits nice.

so i`m guessing that the voltage drop underload is normal and i think i need a 150k pot instead of a 200k pot, as 147k would get me 5.2 volts to start with, and to stay in the 3 to 3.5 ohm range with the addys.

any thoughts would be appreciated.

 

[inkjet21]

addypops
1) Do you have other batteries to test with?
--no just the two--
2) Are you measuring with both batteries still attached - in post #17, not some other power supply?
--post 17 tests done with single batt--
3) where are you taking the measurement... how are you taking it using the meter... where do you touch the leads (this is just a double check... no offense)?
--no offense taken i`m here for help and sometime you miss the stupid stuff,,i put my meter leads to the wires going to the addy about 3 inches from addy.you can see that in my layout pic post 12---
4) If you measure the battery voltages individually, do they read around 3.6 - 4.2?
---yes both read 4.2 fresh from the charger---
see post above for todays thoughts

5) Those are 14500 batteries?
--no 18650-- 2400 mah

 

[inkjet21]

nuck
whats wrong with the ultrafire batts, they have good reviews everywhere i looked??

 

[AttyPops]

It should maintain the voltage... by drawing more amps. If that unit is starved for amps, voltage will suffer. However, usually a 18650 is sufficient (or so I hear). Just for giggles... try hooking both batteries up again. Parallel gives you double amps, series gives double voltage.

Just a thought. Maybe something didn't connect correctly the 1st try with 2 batts so it "was the same". Breadboards can be funny (but we get to blame em for stuff like this too...lol). Also, your post 21 seems to indicate it is starved for amps (my best guess).

It looks like from your test 3.9ish volts with the pin open (under load) is the best you will get from that single battery, but I bet you get more with 2.

 

[Nuck]

Those bats are the issue. The whine from the booster happens when it gets starved for current. The bats you have are rated for 0.5C which are not even close to being able to handle the current draw you are looking for. You need to use bats that can handle continuous discharge of 4+ amps.

Get some AW 2600 or 2900 and I bet you the problem goes away. Voltage drop is not normal when the chip is used within spec and supplied sufficient current.

 

[inkjet21]

thanks guys i guess ill use these batts for the flashlight(as a light) and pick up some aw`s and try again, be back in a week or so with new tests with better batt.

 

[Minus1724]

Like Nuck said.. I had the same problem, I was using 3 x Nimh batteries. Then I switched to 18650 Trustfire battery, and the chip stopped screaming at me and I got a more stable voltage.

 

[addisdaddy07]

definitely the batteries, I have tried many combinations, the best for this chip that I have found is the 18650. I wasn't even able to get it to do anything but sputter with the 14500 and tried a pair of 1.6 nominal voltage nicd batts that didn't boost well loaded at all. Spring for the bigger batteries, you won't be let down.

 

[WillyB]

Well Sci who has a lot of booster experience just posted this, his latest mod.

http://www.e-cigarette-forum.com/forum/madvapes/161286-small-clear-case-boosted-14250s.html

 

[inkjet21]

thanks willyb,
I did make a better rig for parallel battery's and i I'm getting better test results using 2 18650 ultrafires 2400s now instead of a 2 or 3 volt drop i`m getting about .6 volt drop . but its still no good with just one battery. i`lll have to get me a couple aw`s and get it to work with one battery instead of 2. damn house payment due this week ill have to wait a week before i can get the aw`s.

 

[mwa102464]

Well Sci who has a lot of booster experience just posted this, his latest mod.

http://www.e-cigarette-forum.com/forum/madvapes/161286-small-clear-case-boosted-14250s.html

That's a cool ... Mod, I think that would be a super hero with a pair of AW IMR 26650's in it...!!!

 

[WillyB]

thanks willyb,
I did make a better rig for parallel battery's and i I'm getting better test results using 2 18650 ultrafires 2400s now instead of a 2 or 3 volt drop i`m getting about .6 volt drop . but its still no good with just one battery.

Well I'm glad you are getting somewhere. Bit in Sci's mod those inexpensive cells are probably only providing 550 true mAh total (maybe).

 

[Nuck]

Well I'm glad you are getting somewhere. Bit in Sci's mod those inexpensive cells are probably only providing 550 true mAh total (maybe).

Those bats, even in parallel, are not up to the task. There were a lot of people that claimed a regular 14500 was working fine. Just because you can get it to vape when fully charged doesn't mean they are functional.

There is no way around it. If you want the power to push the chip to its full potential, you have to have a power source that can sustain up to 4 amps during the complete battery cycle without damaging the bats.

 

[roadrash]

thanks willyb,
I did make a better rig for parallel battery's and i I'm getting better test results using 2 18650 ultrafires 2400s now instead of a 2 or 3 volt drop i`m getting about .6 volt drop . but its still no good with just one battery. i`lll have to get me a couple aw`s and get it to work with one battery instead of 2. damn house payment due this week ill have to wait a week before i can get the aw`s.

It should work fine with just 1 18650 batt. Ive been running the same booster with one ultrafire 18650 -1200 mah for 8 months now with no voltage drop at all. Most of my problems in the beginning were always bad connections (crappy soldering to be procise.lol)
i believe if you have a loose connection the output would still be 5 volts until you fire it. and correct me if I,m wrong. But when that happens the booster will drop out and you will be on battery voltage.

 

[inkjet21]

Yes i can vape with 1 18650 but its not right. the voltage drops out to much and the hit is weak, when i use 2 in parallel it works way better. and if i put a 47k res on it i get a solid 4.97 volts when i hit it..and thats a bit hot for the clearcarto at 2.7 ohms i need to get a better thumb wheel or i was looking at a few 4 pos switches that i think will be nice just to use 4 res and have 4 set volts, just need that better battery to finish up my testing then i can make the circuit as small as possible before i make the case for it. its mostly done in 3d solid works,then its off to the cnc for milling.

 

[WillyB]

Those bats, even in parallel, are not up to the task. There were a lot of people that claimed a regular 14500 was working fine. Just because you can get it to vape when fully charged doesn't mean they are functional.

There is no way around it. If you want the power to push the chip to its full potential, you have to have a power source that can sustain up to 4 amps during the complete battery cycle without damaging the bats.

I know where your coming from Nuck, you'll note proper power was my first point.

Sci has been a proponent of these for quite a while. Here's a few comments on his little one;

It doesn't whine, right now all you can hear is juice cooking. I vaped it on & off for about an hour last night, I'm going to run it until it stops today(using the same batteries from last night without recharging). These little 14250s are really suprising.

The 14250s are in parallel. I metered this & she's putting out 5.0v & vapes like a monster. I was completely surprised! I don't know how long it will last yet, the batteries are 320 mAh, but being in parallel should extend it a little.
Will a single vape?

I vaped for aboutt an hour last night, the batteries set outside the mod for the night, then just got 2 hours out of them today. A total of 2.5 ~ 3 hours of solid vaping.

But there seems to more going on in this case, "to push the chip to its full potential" is one thing but to get an instant voltage drop sounds like there is more involved in the OP's case.

 

[drewk302]

Hey I was just wondering if you soled your problem? I have the ti 4050 that you have and your schematic is what I want to use, the caps and the 200ohm pot, just cause I have those sitting here.

 

[Spliner]

One of my favorite mods (goes with me everywhere) is a 2xAA box with a PTN04050cad boost using an AW 14500 Protected Li-Ion. Reads constant 5v without a load and drops to 4.8v under a load. I get decent run time out of it, and use 3.0 ohm cartos from Boge with it. Love that little mod.. its a beast! Can also use AW 14500 IMR batts in it but I prefer the protected Li-Ion's from AW so I don't over drain the IMR's.

Edit: For clarification.. that's a 2xAA box with a single AW 14500 @ 750mAH. Constant vaping I get about an hour give or take.. moderate vaping up to an hour and a half to two hours.. and carrying it around in my side jacket pocket to vape whenever my 3.7 mod is just not cutting the mustard.. it lasts hours.

 

[breaktru]

I'm confused, where did you get the 200 ohm pot value? It seems to me the 200 ohms pot is for the 08100w regulator and that the 0450c reg uses a 100k ohms pot in series w/ a 10k fixed resistor (Pin 1 & 3) and a 100k ohm fixed resistor across Pin 3 & 4. And with a 3amp diode on Pin 4 to atty I got approximately 3.6v to 6.17v at the atty.

 

[drewk302]

Oops he was using a 200k pot, I had to go back and reread. I have done lots of searching and couldn't find any with my config. Everyone says to go look at the ti spec sheet and for some reason I can't open it. I have tried for days. I will have to try your setup. Thanks break. I misunderstood I thought I could just use my 200ohm pot I had here. I knew I needed a resistor just didn't know values.