Info on H Bridge Motor Driver - G014, Motor Drive, G014-01 BI-DIR.DRIVE II (Bi Dir Drive II)


Recently into my possesion came two of these salvaged H-Bridge motor driver circuit boards. I do not know what ratings they have, but here is what I do know:

  • The circuit boards came with 22.5V, 2.1A, 28W Cont Duty DC motors.
  • The gate drive voltages are (based at looking at the PCB) one half of the VIN - so since the FETS have a max of 15V on the gate, I'd say the maximum input voltage is 30V. This may overheat resistors, however. It is probably designed for 20-24v.
  • The big transistors are MOSFETS:
  • Highside drivers: MTP2955 (12A, 60V, P-Channel)
  • Lowside drivers: MTP3055E (12A, 60V, N-Channel)
  • I tested it on 12V, and found the following to be true:
  • 12V is not quite enough voltage for full current operation: The fets need 10v on the gates to turn fully on, and the gate voltage is half of power in voltage.
  • The little black plug is the input control.
  • The plug on the left in the photo above is Power In, ground on top.
  • The plug on the right in the phto above is Motor Out.
  • The Lower pin on the Control Plug (Bottom Left in photo) turns on the motor when the pin is grounded.
  • The upper pin on the Control Plug reverses the direction of the motor when it's turned on with the other control pin.
  • Both input pins are internally pulled up to the supply voltage.
  • The ON pin, when shorted to ground, sources 6mA.
  • The REV pin, when shorted to ground, sources 12mA.
  • I (Jesse) was in a hurry when I did this, so send error reports to jesseg (at symbol) nikola (dawt symbol) see oh em.