KLON Centaur / Clones Charge Pump Differences

[mickeybellinello]

Hi to All,

I'm starting to built my own Klon clone. I ordered the Aion Refractor PCB which is the "verified" 1:1 copy of the original circuit.

I printed the "real one" and the "refactor" schematic and I see some changes in the power section:

Here's the original:



Here's the refractor one:



As you can see the 1uf capacitor in the "refractor schematic" are 10uf, same thing with the original 47uf cap (C17)...

Why that?

Thanks so much!

[antonis]

Different ICs..

[phasetrans]

Different ICs..

For the general edification of people using voltage converters. Microchip makes a "high" frequency version of this, the TC7660H. You can use smaller caps, the switching frequency is out of the audio band at 120kHz.

[mickeybellinello]

Thanks to all,

so...if I use original values with original chip I'm right?

[antonis]

As right as you should be by using replacement chip with replacement values.. 
(considering both extracted from manufacturer datasheets..)

[phasetrans]

Thanks to all,

so...if I use original values with original chip I'm right?

There's nothing magic in the circuit about this IC. It just supplies 18V by charging a cap to 9V and shoving the leg to 0V.

The original part is obsolete, and had a low switching frequency. The more modern part, with larger caps, will work better and shpuld have less ripple. Arguably the most important component choice here are the capacitors.

I suggest the TI 1044 data sheet, or the microchip 7660H data sheet for more information, and formulas to calculate ripple.