Need help with TI Boosters, please

[CloudBurst]

Hi there all, I got these TI Boosters and really have no idea what to do with them now or which one is the one I need to use. I wanted to boost a 3.7 18650 to 5v but when they came in, the description was a little confusing. Any help would be greatly appreciated. Here's what I have...I also have the caps but no pics needed. LOL at least I don't think so yet!

 

[Sci]

Stormi, the ones I have are PTN04050C, the one you've got are A. I just looked on the site, those put out a - voltage. Go here. That's the ones you want. Then you can go by the pics.

 

[CloudBurst]

I found these last night and ordered them, so these won't work?

 

[Sci]

I found these last night and ordered them, so these won't work?

I wouldn't think so, they put out a negative voltage.

 

[CloudBurst]

Ok, thanks, I'll let you know when the others come in if I need help. LOL Shouldn't be to difficult with the pics I have. Thanks again!

 

[WillyB]

You should try them it may not make a difference. Voltages are based on the common. If you test a battery with your meter (pos to pos, neg to neg) it will read a positive voltage. If you switch the probes you get the same number, only it's now negative. An atty can be wired either way, I often run the neg to the center connector.

Or maybe you can switch the Vin leads.

Inquiring minds want to know.

 

[CloudBurst]

WillyB- if you can give me a drawing of how to wire it, I'll give it a shot.

 

[WillyB]

I just checked the spec sheet, it's only good for 1A and will take some resistor finagling to get it to 5V. The 'C' models default to 5V. Best to just toss them.

A 1% resistor must be connected between pin 4 and pin 1 to set the output voltage of the module. If left open-circuit, the output voltage defaults to –1.79 V

 

[CloudBurst]

Ok, thanks, waiting on the correct ones.

 

[BuzzKill]

You can use the reverse voltage BECAUSE there is NO common or ground to earth .
BUT 1 amp will not cut it !

get the new ones .
Heres a trick , instead of using a fixed resistor use a POT and it will become adjustable !

 

[Sci]

Ok, thanks, I'll let you know when the others come in if I need help. LOL Shouldn't be to difficult with the pics I have. Thanks again!

No prob. If you run into any problems, post 'em.

I like using these a lot better than using 2 batteries in series. I've got one & an 18650 in an eclipse tin & haven't put it down since I made it. Only thing, the cartos/carts don't last as long.

 

[CloudBurst]

I just made a 5v juice box!! I'm really liking it right now. I have tons of 16350 battys just sittin around so, I put them in a Radio Shack box with a juice bottle. I have tons of regular attys but since I started using the EM LR's I can't go back to 3.7 w/regular attys.
I guess I like LR's or 5v, can't wait to get my boosters!

 

[mamu]

Storm - here's a wiring circuit for the boost board that WillyB shared with us a while back.

The board I use is PTN04050CAD when I use a veroboard in the mod cuz of the longer solder posts and I use PTN04050CAZ when I want it directly in the mod without any other circuitry.

The caps I use are either T356J107K010AT (through hole for veroboard use) or B45197A2107K409 (surface mount soldered in line with the boost board). Make sure you pay attention to the + and - on the caps and get them soldered in place with the right polarity.

You can get all the parts at Digikey.

Hope this helps. Good Luck!

 

[Badass45]

What ohm pot would be used with the new board to make it adjustable?

 

[SurvivorMcGyver]

What ohm pot would be used with the new board to make it adjustable?

You could use a 150K or 300K (the 300k Uniit will get you closer to 5 volts if that is desired). A chart for resistor values can be found in the specs. Just know that most "pots" have a short 200 turn life. So lots of "tweeking" could wear it out sooner than latter

Other helpful hints:

Place it so it is easily replaceable.
Buy two
Go high quality
Sealed units are recommended (example 3296X by Bourns)

Here's one with a 50,000 turn life (no load) that I have yet to try but looks promising

 

[Badass45]

Being the pots are 3 pin, how would that hook up in the circuit?

 

[SurvivorMcGyver]

Being the pots are 3 pin, how would that hook up in the circuit?

Center pin to either of the outside pins - you might find use for the full feed through restistance of both outer pins (bypassing the center (wiper) pin) but I don't use it - not in ths application. You could probably put a switch in there to give you full restance or adjustable .......... (I could go on and on and on and on) ....... But it's your choice.....

 

[Sci]

Here's the pics I made for Stormy-

I shrink-wrapped one capacitor leg to keep it from touching anything else.

 

[5cardstud]

I agree get one of these: DE-SWADJ Adjustable Switching Regulator, from Dimension Engineering and go adjustable.

 

[Distorted.Clarity]

that diagram has me all kinds of confused. why is the (+) and (-) connected after the switch?

edit:never mind.

is there just a board i can use to boost my 14500?