Question and problem with 5v regulator

[Vadim]

Hmm. Maybe just one hardware item at fault... the regulator.

Try one of these some day.

Digi-Key - 296-8157-5-ND (Manufacturer - UCC383T-5)

Got the TI 5 volt regulator also the black & red 14500 batteries.
All seemed to be working fine for about 2 weeks with 2.2ohm original 510 atty.
After the 2 weeks, not sure what is going on either the switch goes bad or maybe regulator over heats and shuts off and this happens on with any atty or cartomizer.
Over all I am happy but still looking to build a long lasting 5v box with 2AA battys.
Now working on and with a 2AA box, trying to squeeze 2 battys, 1 regulator, 1-510 connector, 1 switch into this small box. I am about 80% done.

 

[eHuman]

batteries are the problem I think (or rather the disgn itself). You are using a 5v regulator and a 6v source. Part of the 6v is used (dropped) for control, whats left goes to the regulator and 5v of it on to your atty.

At the rate of current draw/battery drain, I think you may be dipping below the regulator's cut-off in the 5 seconds you are describing. (I could be wrong, just a best guess).

Try increasing the 470ohm resistor value between source and ground.
Or adjust (if possible) the regulated voltage down a bit say 4.6v?

Added: Lol guess I should have read the entire thread before posting.

 

[Vadim]

Thank you for the input EHuman,

My setup as with most people is:
2 x 3.7 battys (TF 14500 red/black label, seem to work better than grey's)
1 x 5 volt regulator
(Madvapes 4 pin regulator but do not use the control or TI 3 pin regulator)
1 x master On/Off switch
1 x button switch (I think it is a 1 amp, can't find find a 2 or 3 amp tiny switch and do not want to use the control pin for a small switch)
1 x 3AA box

Maybe it is my switch which burns out after some use? If that is the case then I maybe forced to use a 470 ohm resister on the control PIN.

 

[Scott Tenorman]

Thank you for the input EHuman,

My setup as with most people is:
2 x 3.7 battys (TF 14500 red/black label, seem to work better than grey's)
1 x 5 volt regulator
(Madvapes 4 pin regulator but do not use the control or TI 3 pin regulator)
1 x master On/Off switch
1 x button switch (I think it is a 1 amp, can't find find a 2 or 3 amp tiny switch and do not want to use the control pin for a small switch)
1 x 3AA box

Maybe it is my switch which burns out after some use? If that is the case then I maybe forced to use a 470 ohm resister on the control PIN.

If it works for a while then stops it is not your switch. A switch (in general) is either working or it isnt, there isn't really any in between. If the cutoff is happening the same way every time then your switch is fine.

 

[WillyB]

Got the TI 5 volt regulator also the black & red 14500 batteries.
All seemed to be working fine for about 2 weeks with 2.2ohm original 510 atty.
After the 2 weeks, not sure what is going on either the switch goes bad or maybe regulator over heats and shuts off and this happens on with any atty or cartomizer.
Over all I am happy but still looking to build a long lasting 5v box with 2AA battys.
Now working on and with a 2AA box, trying to squeeze 2 battys, 1 regulator, 1-510 connector, 1 switch into this small box. I am about 80% done.

Well you didn't list the switch you were using.

Now working on and with a 2AA box, trying to squeeze

These LDO's tend to generate a bit of heat which should be dissipated. They need breathing room. Heat is the enemy of all things electrical.

 

[Vadim]

Well you didn't list the switch you were using.

LOL!
I am on vacation at Virginia Beach and do not have the box\label the switch came in with specs on it.
Will provide info when I get back home on Thursday.




These LDO's tend to generate a bit of heat which should be dissipated. They need breathing room. Heat is the enemy of all things electrical.

You have a good point about the heat, guess just want to see if I can build it, very tight squeeeeeze.



Thanks,