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DRV8703-Q1EVM: About how to check the protection function (flag generation) using DRV8703-Q1 EVM

Hiroaki Masumoto
Expert 1210 points
Part Number: DRV8703-Q1EVM
Other Parts Discussed in Thread: DRV8703-Q1,

Dear Support team,

Our customer will use DRV8703-Q1 in their application.
They are using the DRV8703-Q1EVM to check the occurrence of a flag when a fault is detected.
Please tell me how to generate a fault without destroying the EVM board there.

1) Charge-Pump Undervoltage (CPUV) Lockout
   Does the flag generate by short-circuiting the capacitor terminals connected between the VCP pin and the PVDD pin?
   Please tell me if there is any other good way.

2) Overcurrent Protection (OCP) Set the VDS setting value of the VDS control register to 000b = 0.06 V.
   Can OCP flag be generated by rotating the motor at high speed? Please tell me if there is any other good way.

3) Gate-Driver Fault (GDF)
   Is the GDF flag generated by short-circuiting the GH1 pin (TP6) to GND?
   Is this device destroyed in this way?
   Please tell me if there is any other good way.

Best Regards,
Hiroaki Masumoto

  • 0
    TI__Expert 4435 points

    Hello Hiroaki-san,

    We will investigate and reply to you soon. Thank you

  • 0 in reply to Luis Riveros
    Expert 1210 points

    Hello Luis-san,

    I am looking forward to hearing from you.

    Thank you

  • 0
    TI__Expert 4435 points

    Hello Hiroaki-san,

     

    1) Charge-Pump Undervoltage (CPUV) Lockout.

    For CPUV test, please disconnect the 1uF capacitor connected to VCP, then use a source meter to source separate voltage to the VCP pin (ex, VM+4V). Then slowly vary the VCP voltage, you should trip the CPUV fault report around V_vm+1.5V. Please note the source meter should be able to sink current.

     

    2) Overcurrent Protection (OCP) Set the VDS setting value of the VDS control register to 000b = 0.06 V.

    After you set the VDS value. Please do the following:

    - Remove the 0 ohm resistor from the GL2 to the gate of the FET.

    - Place a 1k ohm resistor from the gate to GND

    - Place a resistor from VM to SH2 pin so you have a higher voltage differential on the SH2 pin than the VDS value set.

     

    3) Gate-Driver Fault (GDF).

    For GDF fault, please connect the GL2 pin to GND. GDF should flag. Thank you.

  • 0 in reply to Luis Riveros
    Expert 1210 points

    Hello Luis-san,

    Thank you for the detailed explanation of how to generate flags.
    I understand the contents of the reply.
    I will inform this information to customers.

    Regards,
    Hiroaki Masumoto