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Author Topic: Mix-Pre 3/6 USB Batteries (what works and what doesn't)  (Read 40377 times)

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Offline justme

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DC to USB-C PD power option for MixPre 3/6
« Reply #210 on: August 18, 2019, 06:13:20 AM »
I wanted to explore some of the popular DC to USB-C PD power converters that have begun to appeared this year.

It's a DC voltage to to USB-C PD compliant converter. There are many input connector option for them but I opted for the DC 5.5/2.5 model.
https://www.aliexpress.com/item/32946474518.html
It's recommended input voltage is 20V. And a max input of 22 volt.
Thats a bit annoying as packs of 4 li-ion cells might not be enough and 6 cells are too much. So DIY packs of 5 cells would be needed.

Anyway, I powered it from an external power pack using 4x18650 Li-ion pack with 14,8V output I can charge my Pixel 2 and a lot of other USB-C devices without a problem.
I then hooked it up to my MixPre-6 over USB-C and it booted perfectly. But shortly after warned me that the power source was not enough and wanted to switch to 4xAA-pack.
So I connected the converter to 20V DC power instead and that gave it enough headroom to supply the MixPre-6 with enough USB-C PD to make it happy.

The plastic case comes appart easy using the nails and the internals reveals a Chinese USB-C PD chip:

Manufacturer: Injoinic Corp
Chip: SOC IC--IP6527
http://www.sz-dowell.com/static/upload/ueditor/file/20181218/1545115664843095471.pdf

The chip specs states:
Input operating voltage range: 8.2V to 32V
VIN VIN=12V, VOUT=5V/3A, board end conversion efficiency 96.5%

But this did not appeared to be liked by the MixPre anyway. Or due to the way of the implementation of the chip in the converter.
I'll do some more tests but not using the Mixer as a guinea pig. :)

 

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