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DRV8412: DRV8412 Some issue appear in the process of use, I hope to your reply. Thank you.

?? ?
Prodigy 10 points
Part Number: DRV8412

Tool/software:

This is a schematic of DRV8412 drive a therm heater.

 I encountered the following problem:

1.DRV8412 is damaged, OUT_A&OUT_B has output, OUT_C&OUT_D has no output, strangely, the Fault pin and OTW pin are high. Is this  an OTSD occurs? According to datasheet, RESET_CD need to have a low to high transition to clear the fault and FAULT signal, and this method does not restore OUT_C/D output.
Is this internal chip damage? How to determine what causes chip outC&D no output?

2.In a typical circuit with datasheet, the output does not require inductors. In this design, will out_A/B accessing both inductors cause the current to reverse puncture the drive sensor? Or do you have a better suggestion?

Looking forward to your reply. Thanks!

  • 0
    TI__Genius 16290 points

    Hello,

    In the design have you had success with OUT_C and OUT_D functioning as intended prior to them having no output? If both nFAULT and nOTW are high, then the device is under normal operating conditions. If OTSD were to occur, then nOTW would have been pulled low. Have you seen a fault occur at any point during testing? If so, can you please provide those scope captures while triggering on the fault pin. 

    Having inductors at the outputs can cause "inductive kickback" during switching periods. Typically, a diode is connected in parallel with the inductive load to reduce this inductive kickback. 

    See the following app note for more information on driving inductive loads with motor drivers:

    Using DRV to Drive Solenoids (Rev. A) (ti.com) 

    Best,

    David

  • 0 in reply to David Medis
    Prodigy 10 points

    Thanks for your replay!

    Both OUT_A/B,OUT_C/D worked before. Both nFAULT and nOTW are high now. Could it happen that the chip is only half broken? How should I test those scope captures while triggering on the fault pin?

  • 0 in reply to ?? ?
    TI__Genius 16290 points

    Hello,

    Probe the output voltages and if possible, the current and trigger on the nOTW (falling edge). This should tell you if you are triggering a fault because of overtemperature. Then try this same setup but triggering on the nFAULT (falling edge). 

    Best,

    David