Hi Kevin,
Thanks for the information. Are you able to measure the output current going to the TEC with a current probe?
The OCP on the device has a tblank time associated with it that the driver will ignore the current sense resister voltage. This is intended to allow the current due to the inductance of the motor to settle before the driver begins limiting it. I suspect you maybe be hitting the OCP threshold in that tblank time on some of the devices.
Thanks for the information. Are you able to measure the output current going to the TEC with a current probe?
The OCP on the device has a tblank time associated with it that the driver will ignore the current sense resister voltage. This is intended to allow the current due to the inductance of the motor to settle before the driver begins limiting it. I suspect you maybe be hitting the OCP threshold in that tblank time on some of the devices.