• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 791 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8701: MOSFETs are disable for DRV8701

Mickey Zhang
Genius 12080 points
Part Number: DRV8701

Hi team,

The customer is using DRV8701P.  The customer's issue is  once the power is supplied for his board, all Mosfets are disable.

a. VM is 12.3V and it is stable. VCP is 22V. VREF is set 3V. AVDD is 4.8V and DVDD is 3.3V.

b.  SNSOUT pin is the high level. nsleep pin is the high level.

c. The IN1,IN2,nFault,GH1,GL1,GH2,GL2,SH1 and SH2 waveforms are in the attach. nFault pin is the low level for a long time. 

d. Please check the customer's schematic in the attach.

DRV8701P.pdf

                                                                 GH1_1

 

                                        GH1_2

 


                                            GH2

 


                                                GL1

 


                                    GL2

 


                                            IN1

 


                                                IN2


                                nFault

 


                   SH1

 


                                 SH2

Would you provide some suggestions for the customer's issue?

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments

 

  • 0
    TI__Guru** 114905 points
    Hi Mickey,

    Please use the Fault response table as a guide to determine if one of the 5 faults listed is the problem. Two channels of the scope should be used.

    Trigger on nFAULT and monitor the other signals (VM, VCP, VDS, GHx, GLx) prior to the fault occurring.