• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 342 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.

LMG1205: Output Gate Pins (HO and LO) are giving 5V DC output when HI and LI are gate pulses of 7.8 V and 700Khz. suplly across C701=5V. please suggest solution.

SUDHANSHU TELRADHE
Intellectual 300 points
Part Number: LMG1205

  • 0
    TI__Genius 13445 points

    Hello, 

    Thanks for your interest in our drivers. 

    If i understand the issue correctly (please correct me if I am wrong), you're seeing a 5VDC voltages on TP700 and TP701 when applying 7.8V, 700kHz pulses at the inputs with VDDx = 5V? From the description, it sounds like the outputs are both stuck high and the driver is not recognizing the low commands from the input.

    Can you share waveforms that your seeing LI, HI, VDD, TP700, TP701 and SW? How are you probing the high-side gate? Can you also please confirm the load at the driver's outputs?

    Regards, 

    -Mamadou

  • 0 in reply to Mamadou Diallo
    Intellectual 300 points

    Dear Mamadou,

    Thank you for your Reply.

    Your understanding is correct.Actually I kept HO and LO open so there is no Load on driver this might be reason of Gate outputs are both stuck high and the driver is not recognizing the low commands from the input because bootstrap is not charging and discharging. Is my understanding is correct?

  • 0 in reply to SUDHANSHU TELRADHE
    TI__Genius 13445 points

    Hello, 

    It looks like you've resolved the issue. To help others e2e users to benefit and learn from this issue, please feel free to share the root cause of the issue you encountered and how you resolved it.

    Thanks.

    Please let us know if you run into further trouble.

    Regards,

    -Mamadou

  • 0 in reply to Mamadou Diallo
    Intellectual 300 points

    Dear Mamadou,

    I kept HO and LO open so there is no Load on driver this might be reason of Gate outputs are both stuck high and the driver is not recognizing the low commands from the input because bootstrap is not charging and discharging. As I connect HO and LO to GaN FET, LMG1205 driver is working fine.