TB6560 request for feedback

Alex.Stanfield

I've seen posts on several forums stating that the TB6560 is prone to blowing-up. I recall seeing this in relation to multiple axis CNC drivers. And many stating that's impossible to do a single power supply design that will not violate the recommended start-up procedure (see page 28 in http://www.toshiba-components.com/docs/linear/TB6560AHQ_en_datasheet.pdf)

For reference see:

http://www.cnczone.com/forums/stepper_motors_drives/139306-can_tb6560_driver_design_violate_chips_specs.html
http://www.cnczone.com/forums/general_electronics_discussion/110986-fixed_chinese_tb6560_controller_updated.html

However, did someone have any trouble with these cheap boards ??

The reason I ask is that these boards have correctly tied the RESET and ENABLE pins of the TB6560 to a RC network (R between +5V and the pins and C between pins and Gnd) that will hold low both pins until C charges from the stabilized +5V regulator. This IMHO will keep the TB6560 in a high Z state until both voltages (motor and logic) stabilize. This, I guess, should prevent simultaneous drivings on the high and low sides of the outputs.

Any experience/coments on these?

Thanks
Alex

RickB

The THB6064AH is a much improved version of the 6560. Check out this article.
http://www.piclist.org/techref/io/stepper/THB6064/index.htm

Unlike the TB6560, which absolutely requires logic power be stable before motor power is applied,^ the THB6064AH can survive motor power without logic power and will not intermittently short on power up. This is a VERY common failure of the cheap TB6560 drives.

Rick

Alex.Stanfield

Thanks Rick, yes I'm aware it's better and in fact I ordered one pair the last weekend (BTW I found them cheaper in goodluckbuy.com compared to ebay).

EDIT: The 6064 does seem to have better protection. You can see the same power-up procedure as the TB6560 stated in page 35 of the datasheet for TB6064AH (http://www.piclist.org/images/massmind/THB6064AH_ENG.pdf) but it also says the IC will not break even if the sequence is not followed.

Also the reason I ask about TB6560 board is that I already have many for a small CNC project and was wondering is there is any difference in reliability between these single axis drivers and the multiple axis boards.

Alex