Part Number:DRV8840
Support Path: /Product/Development and troubleshooting/
The DRV8840 is used with a PWM (Approx 8kHz) connected to Enable input and Phase input is used for direction.
Sleep = high
Decay = low
I0, I1, I2, I3 and I4 are all high
Reset is low during start up, and then high.
Current limit is set to approx. 3A.
VM = 9V.
A 4 ohm torque motor is connected and is running very well from 0% to 100% PWM (both way). But if the load is disconnect when the PWM is between 10% and 100% the PWM stop !, and DRV8840 require a reset to start up again.
In the data sheet it is stated that OCP can give this state, but in this case is the current below this limit.
Seen this problem before ?