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Original question:

TPS2419: TPS2419

TPS2419: TPS2419 Application leakage current Question

Kami Huang60
Genius 3830 points
Part Number: TPS2419
Other Parts Discussed in Thread: TPS2412

Dear Sir/Ms.

TPS2419 test circuit, when V1 OFF, V2 ON, VA will be about 1~2V, why is this happening, is it a problem of IC itself?

Best Regards,

Kami Huang

  • 0
    TI__Genius 16305 points
    Hi Kami,

    VA sees about 1-2V could be due to the leakage from C to A, let me check this on the EVM and get back.


    Regards,
    Kari.
  • 0 in reply to Karikalan Selvaraj
    TI__Genius 16305 points
    Hi Kami,

    TPS2419 has a hysteretic on/off gate control.
    During a reverse current conditon (like when V1 is ON and V2 is OFF), T1 will not be turned off until reverse current programmed by RSET is crossed. RSET is set to 47k , this programs the reverse turn off threshold to 6.8mV. So T1 will not be turned off until reverse current = 6.8mV/RdsON flows.

    Could you please check if this is the behaviour seen in test schematic above.

    If this is not acceptable, there are two options:
    1. Use linear gate control TPS2412 --> eliminates this issue.
    2. Use TPS2419 with RSET programmed to positive reverse threshold. Leaving the RSET pin open sets the reverse turn off threshold to +3mV (positive value). Please refer to the datasheet electrical characteristics page for turn-off threshold voltage. A drawback with this approach of having a positive value of reverse threshold is that it will have gate oscialltions (turn on and off) at light load conditions. To avoid this, please connect a light load equal to 3mV/RdsON. You could also program the reverse threshold according to the equation 1 in page 6 of the datasheet and choose a corresponding RSET.

    Regards,
    Kari.
  • 0 in reply to Karikalan Selvaraj
    Genius 3830 points
    Hello Kari,
    I will check with my customer and reply you.
    Best Regards,
    Kami Huang
  • 0 in reply to Kami Huang60
    TI__Genius 16305 points
    Hello Kami Huang,

    We will wait for the feedback from customer.
    Until then i will close this thread and it can be reopened when feedback is available.

    Regards,
    Kari.