Part Number: TPS25946
I would like some help and analysis of an existing problem occurring in the TPS25946xx family of circuits.
In some issues, the documentation does not provide specific information on how the circuit works.
We have conducted tests, which show that the circuits (regardless of the version) lock when the overcurrent protection is triggered, and the only way to turn them off is to disconnect the power supply to the circuit. In addition, the TPS system that was loaded with a low-power brush motor (max 10W) also locks ("freezes").
The described problem also applies when the output of the TPS circuit was not loaded in any way or another type of load was connected to the output of the circuit.
Test conditions:
The TPS25946 circuit laden with a low-power brush motor (max 10W), when a signal is applied to the EN/UVLO pin, it turns on the load and at this point the circuit is locked preventing it from turning off via the EN/UVLO pin, the Auto-Retry function also does not work, and the motor still runs.
Configuration of the current protection threshold in the circuit: about 6A.
Power supply (BAT+) 5V - 17V
Tests were carried out on TPS259460A, TPS259460L, and TPS259461A circuits.
Diagram of the circuit under test:
Is it possible to fully functionally control the switching on and off of the circuit via the EN/UVLO pin?
Is the phenomenon of the circuit locking (freezing) in the working (output on) state correct?
Subsequent tests have shown that the circuits without the Citimer capacitor attached work correctly and do not lock up. Is there a limitation on the minimum/maximum value of the Citimer capacitor?
According to the documentation, the circuit on internal locking should turn off:
In our test case, the circuit locks up ( freezes) every time and does not turn off the output of the circuit
