Drv11873 can not work in the application. The output voltage of 5V LDO is 0V.
The following attempts have been made
1. Connect the external 5V voltage to the 5V output port of the IC, and the motor works normally;
2. Worried that the 5V current exceeds the load current by 20mA, the external 5V current is tested by an external instrument, and the measured value is 0ma (the current does not flow from external 5V);
3. Disconnect the external 5V input. The magic thing is that the internal 5V has output again and the motor works normally (so far, at least two machines without 5V output have appeared).
So the DRV11873 internal how to contorl the 5V LDO output ? We use 50% PWM input to control the DRV11873,and VCC is 12V.Power on sencuence is first PWM input,sencond 12V setup ,and the Interval 210ms .
Motor parameter: Terminal Resistance:4.5Ω Inductance:1.0mH Kt:0.006Nm/A 12poles 3 phases, Brush less.
Please let me know if you need any other information ,Sincerely looking forward to your reply .