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:
(https://i.ibb.co/3hC6stp/TWO.png) (https://imgbb.com/)
Here's the refractor one:
(https://i.ibb.co/3R9hbfk/ONE.png) (https://imgbb.com/)
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!
Different ICs..
Quote from: antonis on October 02, 2019, 09:01:37 AM
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.
Thanks to all,
so...if I use original values with original chip I'm right?
As right as you should be by using replacement chip with replacement values.. :icon_wink:
(considering both extracted from manufacturer datasheets..)
Quote from: mickeybellinello on October 03, 2019, 05:03:42 AM
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The original part is obsolete, and had a low switching frequency.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.