5v regulator

[Nuck]

How's your amp draw off the batteries, Nuck? I missed your setup - what voltage are you running?

The newest mod allows me to switch between 4.0v up to 6.0v. The current draw is stabilized by the caps but the final draw is dependent on the resistance of the atty (the mod uses adaptors for all models so it's a wide range from 2.5 to 3.7 ohms). The mod I have has protection built in and even with a low resistance atty (510) it never triggers so its looking really good.

I'll post the mod description later today. It's currently at another forum.

 

[mnealtx]

I look forward to seeing it - I was able to get a boost regulator sample from TI, so I'm looking forward to playing with it once I'm home.

Were did you get your caps/resistors from? I'm guessing not RS.

 

[Nuck]

I look forward to seeing it - I was able to get a boost regulator sample from TI, so I'm looking forward to playing with it once I'm home.

Were did you get your caps/resistors from? I'm guessing not RS.

I got the low ESR caps from ebay at a good price:

20 pcs, Tantalum Capacitors 100uF 10V LOW ESR (Size D) on eBay.ca (item 300333018252 end time 23-Sep-09 03:04:28 EDT)

and I got the ceramics from digikey but you can get these pretty much anywhere:

Digi-Key - 445-2882-ND (Manufacturer - FK26Y5V1A226Z)

You can get the low ESR from Digikey as well if you have an order that makes it worth the shipping.

 

[mnealtx]

I don't have access to ebay - have to check digikey I suppose

 

[Nuck]

These low ESR caps should work fine from digikey:

Digi-Key - 495-1529-1-ND (Manufacturer - B45197A2107K409)

 

[mnealtx]

Thanks for the info and the link to the cpas, Nuck - I'll have to go find the thread where y'all were talking about it to see where they slot in.

 

[googled]

h8isgr8 :
The PTN04050C listed on the TI site has 5 different versions suffixed with Cx, which is the one you sent me ?

I've been trying to get it working using I think faulty 10440's (I have 18650's en-route from DX) . The 10440's would allow a few draws then shut down, the same was happening in the voltage regulator circuit I then tried some 10430's I had from an e-cigar I bought and those work - so far- flawlessly.

 

[h8isgr8]

h8isgr8 :
The PTN04050C listed on the TI site has 5 different versions suffixed with Cx, which is the one you sent me ?

The suffix can mean multiple things, but the only important one is the connection type. Suffix AS and AH have pins, the rest have solder balls.

You would probably want pins to make the connections easier. The one I sent you had solder balls, but I removed them and connected wires.

Here, a picture is worth a bigillion words.......

 

[Nuck]

A bit more info on battery capabilities as they relate to the PTN04050C chip.

The smallest battery that can hold and maintain the current even as low as 5.2v is the 18650. There is a very wide range in the continuous discharge capabilities between different 18650. Given 5.2v and using a 510 atty at 2.3ohm resistance, the pull of the various types of 18650 under load has ranged from 3.9 to 5.2v. The cheap trustfires are just not up to the job.

The results are far far worse if the proper capacitors (4 required) are not used. If you are using this chip I highly recommend a high quality 18650 Li-ion or better yet, a LiFePO4 which has a much higher discharge rate and has the benefit of much improved safety.

I wouldn't waste your time using this on any smaller batteries. The discharge rate just isn't there.

 

[h8isgr8]

LiFePO4 for teh win........ as the kids would say.

These are truly amazing batteries.

 

[Ez Duzit]

Had to search for this thread, but found it, and just ordered my 5 samples. That is awesome.
Pretty educational thread to read thru also.

 

[HippyGirl]

So where can I get the TI 5V regulator if I cannot order them from TI? I registered, went to the samples page, searched for UCC383TDKTTT-5G3, tried to add it to my cart and got an error page.

I found a couple of other online sources, but both said these were not in stock and the wait time would be 4 weeks.

Don't wanna wait 4 weeks, KWIM?

Thanks,

Sherry

 

[Nuck]

So where can I get the TI 5V regulator if I cannot order them from TI? I registered, went to the samples page, searched for UCC383TDKTTT-5G3, tried to add it to my cart and got an error page.

I found a couple of other online sources, but both said these were not in stock and the wait time would be 4 weeks.

Don't wanna wait 4 weeks, KWIM?

Thanks,

Sherry

Digi-Key - 296-16029-1-ND (Manufacturer - UCC383TDKTTT-5)

These guys generally have it to you next day.

 

[Ez Duzit]

So where can I get the TI 5V regulator if I cannot order them from TI? I registered, went to the samples page, searched for UCC383TDKTTT-5G3, tried to add it to my cart and got an error page.

I found a couple of other online sources, but both said these were not in stock and the wait time would be 4 weeks.

Don't wanna wait 4 weeks, KWIM?

Thanks,

Sherry

They're in stock. Here's the page I just checked. Linear Regulators - Single Channel LDO - UCC383-5 - TI.com

Part number - UCC383-5. Click on samples on the bottom of that column and the page scrolls down to the sample order form. Any of the available samples there will work fine. You can get up to 5.

 

[HippyGirl]

OK...I ordered 3 of the UCC383TDKTTT-5G3's and 2 of the UCC383T-5's.

Don't know why I couldn't get to the order page last night, but no problem today.

Thanks for the help!

Sherry