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LM5107: 3 PHASE BLDC MOTOR DRIVNG UNIT FAILURE

Koushik Balaji
Prodigy 20 points
Part Number: LM5107

Theres been a random failure in a BLDC Motor driver unit that comprises of

The unit: A motor driver PCB (Microcontroller, Predrivers, 3 legs of N chn FET's) along with a BLDC Motor.

Topology: 3 phase full bridge (all NChn FETs driven 3 half bridge driver I.C's).

Failure mode: any one of the 3 phases (Both HS and LS Fets along with their Pre-driver gets blown off in normal operating conditions).


Quick Specs:
Vin range = 8.7 to 18Vdc
Normal operating range = 9 to 13Vdc
Current consumption by the unit = 5.5 to 6A avg

The used FET's are NChn SIR182DP.
Used predriver LM5107.

Kindly do the needful.

  • 0
    TI__Expert 7875 points

    Hey Koushik,

    Thank you for the question regarding the LM5107.

    I have a few questions about your setup here.

    1. Are you operating in steady-state during these incidents?

    2. Does all three parts fail at one time? (HS FET, LS FET, and Driver)

    3. Can you send me the schematic and layout diagrams for me to review?

    4. Is this an older system that just started having problems or is this a new design and system?

    5. What do you mean by the parts get blown off?

    Please help me find out what is going by answering these and if you have any further questions just let me know.

    Thank you,

    William Moore

  • 0 in reply to William Moore
    TI__Expert 7875 points

    Hey Koushik,

    Were you able to find the root problem and a solution for it? If so, I would like to know what you discovered.

    Thank you,

    William Moore

  • 0 in reply to William Moore
    TI__Expert 7875 points

    Hey Koushik,

    I am going to close this thread under the assumption that this has been resolved. If it has not been resolved, please respond with answers to my original questions so that I can help you further or let me know if you have further questions of your own.

    Thank you,

    William Moore