Question on OKR-T Mod

[Sonar505]

Planing on making a mod using a OKR-T regulator. In process of ordering parts. From researching forum some say and correct me if Im wrong adding (2) 10UF 16V caps on input and output Just wanted to make sure if I order these


TAP106K016SCS AVX Corporation | 478-1839-ND | DigiKey

That I am ordering the right ones any help appreciated.

 

[bstedh]

They should work but capacitors are not needed. The regulator words perfectly without them.

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[Sonar505]

thanks for the quick reply I am actually doing 2 of them 1 based on your easy OKR-T mod tut thanks by the way 1 with a 6Amp and dual 18650 and 1 with a 3 Amp using 16340 and thats the one that I worry about.

 

[Java_Az]

These type regulators are almost always used to power logic circuits. Reason the caps are required is switching regulators are quite noisy. Caps are not really used for there capacitance in this situation, but for there filtering ability. So they are used to filter out the noise that would other wise make a logic IC not work properly. Atomizers dont care if there is noise in the voltage they are going to work either way.

On the input side switching regulators themselves are susceptible to noise. batteries are relatively noise free, But if you were adding a passthrew mode where you would be plugging in a ac to dc adapter a input cap might be needed to filter out the noise they generate.

 

[Rader2146]

These regulators have input and output cap's onboard. They do quite well in filtering out the noise and buffering the batteries. I measured a 100mV ripple on the output and the input voltage ripple was also quite low, but I don't remember the number offhand.

Here is output of a naked OKR...

Blue trace is the output, red trace is the input to the inductor.

Edit: Sidenote, the ESR for those AVX caps is too high for this application. Even if additional capacitance was needed, those would be of very little benefit.

 

[breaktru]

Yeah the OKR is quite noisy. Had to add additional ripple filtering for my VCC power regulator for my MCU mod w/ the OKR.