Other Parts Discussed in Thread: CSD18535KCS
As a college student, I tried to use DRV8308 motor driver in the project I participated in, and encountered the problem of overcurrent protection failure.
Dc voltage: 28V
Speed: 8000 RPM
Rated torque: 1Nm
The motor belongs to the driving form of low voltage and large current, so the number of turns of the motor winding is less, and the copper cross-sectional area is large.
Fault symptoms:
1. During the debugging of the motor controller DRV8308, SPI communication was adopted to set the open-loop duty cycle instruction of the motor. It was found that if the duty cycle instruction was gradually increased from low to high, it could be normally increased to 8000rpm.
However, if the duty cycle corresponding to 8000rpm is given directly, the overcurrent protection will fail and the drive will sizzle and not turn.
2. After the slow operation of open loop with a duty cycle, overcurrent protection will appear when the torque load is applied and the maximum increase is 0.5Nm. The motor stops running and the driver is sizzling.
Try to solve:
3. After measuring the DC bus current, it was found that the bus current would not trigger the overcurrent protection of ISEN pin. In addition, the ISEN pin was directly grounded.
4. It is suspected that the voltage drop protection between THE DS of MOSFET triggered overcurrent. Through the 0x0A register, OCPDEG and OCPTH have been set to 11, and the problem is not solved
5, the MOSFET used is TI CSD18535KCS
6. Circuit of mosfet
How to solve it?Thank you very much!
