TB 6600 getting hot

Also, are these really a TB6600?
I bought one of these recently: www.amazon.co.uk/dp/B07SBZ9SM5
I took it apart and found there was lots of space inside (which suited me) but there is no sign of a TB6600 chip in there. I don't know what the actual power IC is, but it was small, square and surface mount.
It turns out that I am not the only one to wonder about this:
www.grbl.org/single-post/tb6600-fake-or-not-but-who-cares
The article above also points out that anything that supports x32 microstepping is _not_ a TB6600.

There is an advantage to this if you don't need more than 3A, there is lots of space inside, and I was able to build a little Hobbing / ELS controller directly into the stepper driver case (3D printing a new lid)

It's TB67S109 IIRC, it is a small QFN packaged chip
my.mouser.com/ProductDetail/Toshiba/TB67...XXc_r7JSUfhOeDjB5zT_
TB6600 is very finicky and dies easily, this S109 is much sturdier and can handle plenty of misuse .

Yes, it seems an entirely satisfactory stepper driver, but it is being mis-described.

Just for fun, here is the widget I described. 

 

Thank you for reminding me, i had forgotten about this
hackaday.io/project/161896-linux-espnow/...-16-motors-over-wifi
A perfect idea to cram in an ESP32 on every drive and have only power go to each drive/motor
I wonder what happens when the pilot arc strikes on a plasma...