Playstation Classic MOD chip for avoid USB current limitation

電流制限回路の制限電流設定用の抵抗値を変更することで、
本体ポートの電流制限値を引き上げることができました。
上流の回路を確認していないので本当に問題ないかどうかまでは確認していませんが、
とりあえずセルフパワーのハブとUSBメモリ３本とコントローラを同時に認識できています。

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in Reddit, u/saaguirre has tested USB power load.

More experiments on USB mystery. Trying to find USB ports supply limit : PlaystationClassic

And he have found datasheet.

This Chip is not FET, but USB current limit IC TPS2533.

label "15JL" is match.

http://www.ti.com/lit/ds/symlink/tps2553d.pdf

This parts works as current limitter for USB port avoid over-current.

But , in PSC , I wonder it is designed for avoid connection 3rd-party controllers,HUBs,USB Flashes.

BTW, We can avoid this USB current limitation with canging RLIM resistor.

This graph is shows between RLIM and Current Limit.

There are series resitors are 6.2kΩ + 220kΩ.
It is 100mA setting on above table and Sony used just this value.

So, I want to more current , such as 500mA , use < 45kΩ.

 (226.2 * x) / (226.2 + x )< 45  , x < 56 

Use <56kΩ resistor.

So ,Lets solder 56KΩ resistor to (1) or (2) point.

Oh...I have not 56k just now.. but I can use 47k temporary!

If I will use 47k  , total resistance is 39k.
This value works limitter for 600mA - 700mA.

Don't Worry!!!!

This is my MOD Chip !!!

Solder It! 

This modification release current limit, but some problem will occur what I didn't know.

I can use three USB flash driver and controller with non-powerd HUB on Port1.

Before this work , It was impossible.

You can use OTG Cable or Powered-HUB for such using.

This is a experiment.