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TLV62569: Over Current Protection

Brian Wang0928
Genius 11650 points
Part Number: TLV62569
Other Parts Discussed in Thread: TLV62568

What's the detailed behavior of the over current protection? Is it clamping by current limit when short circuit?

My customer found that when shorting the output before startup, the device will become abnormal like as bouncing issue below waveform.

Regards

Brian W

  • 0
    TI__Mastermind 26776 points

    Hello Brian,

    Thanks for coming to us about your customer's concern.

    In the case of over-current conditions, TLV62568 uses the peak current control to limit the high-side FET switching current. When the high-side FET reached the current limit (ILIM) threshold, it turns off the high-side FET and switches on the low-side FET to reduce inductor current. The on-time of the low-side FET is controlled by the adaptive off-time circuit. In essence, the device clamps or limit the high-side FET current during overcurrent or short circuit conditions.


    The bouncing observed on the output current might be due to the device goes into TSD (~150 deg. C) and forcing it to stop switching. TLV62568 is off until the junction temperature drops to ~130 deg. C. Once the device temperature is below the thermal shutdown threshold (Tj falling), it will start switching again. However, if the output is still short-circuited, the device will go into an On/Off cycle which might look like a bouncing event.
    Another possible condition where the output current bounces during a short circuit event is that the input voltage dropped below the UVLO and shutting the device. Once the device turns off, Vin will recover to the original level (above UVLO) and switching on the device again. This On/Off cycle will continue until the output short circuit is removed.


    To better understand the issue, please provide a zoom-in waveform focusing on the area where the output current is bouncing, and reduce the voltage per division of the VIN waveform for better visibility. You can ask your customer to use the measurement function of the oscilloscope to capture the minimum voltage.

    Best regards,

    Excel

  • 0 in reply to Excel Regidor
    TI__Genius 11650 points

    Thanks. But what report my customer need is the Back conditions as IPC/JEDEC J-STD-033 Back Conditions as below example:

  • 0 in reply to Excel Regidor
    TI__Genius 11650 points

    Thanks. But what report my customer need is the Back conditions as IPC/JEDEC J-STD-033 Back Conditions as below example:

  • 0 in reply to Brian Wang0928
    TI__Mastermind 26776 points

    Hello Brian,

    Ok. I saw your reply that I should ignore your last post.

    Is the concern with short circuit conditions on TLV62568 still open? Do you need anything from our side?

    Best regards,

    Excel

  • 0 in reply to Excel Regidor
    TI__Mastermind 26776 points

    Hello Brian,

    If you don't have further queries, I will close this thread.

    Feel free to contact anytime for additional questions.

    Best regards,

    Excel