Note I am a beginner :)

This website states that TB67H420FTG motor driver can deliver continuous 1.7 amps for each "channel" i.e. motor. https://www.pololu.com/product/2999

However, Looking at the TB67H420FTG motor driver datasheet https://www.pololu.com/file/0J1510/TB67H420FTG_datasheet_en_20170818.pdf

The constant PWM threshold can be calculated using this formula:enter image description here

Using the datasheet formula for dual control, if had a VREF value of 2 volts (which is typical according to the datasheet), I could provide 2 X 1.25 = 2.5 amps to each channel easily?

Why would this website: https://www.pololu.com/product/2999 state continuous current of 1.7amps when the datasheet shows a much higher max current of 4.5 amps can be achieved for each channel.

  • \$\begingroup\$ it is important to distinguish the correct names of the devices ... one is a motor driver module, the other one is a motor driver IC \$\endgroup\$
    – jsotola
    Jun 1, 2021 at 22:11

1 Answer 1


enter image description here

The datasheet makes it clear that in any circumstance the PEAK current shall not be higher than 4.5A.

  • The peak current is not a continuous current.
  • It depends on PCB area size and number of copper layers, as well the thickness of copper layers
  • It depends on environment temperature

Therefore the device has been tested and it was found out that it can handle max. 1.7A continuous current, probably at 25C ambient air without enclosure.


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