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About "Overload Recovery and Clamp" of TPS54620

Masami Michino
Genius 5070 points
Other Parts Discussed in Thread: TPS54620

Dear, All

It is a question about the function of "Overload Recovery and Clamp" in FUNCTIONAL BLOCK DIAGRAM of TPS54620.
Please let me know the operation of "Overload Recovery and Clamp".


Example: When an output stop re-starts an after-generating power supply by over-current detection on a current sense, once extract an electric charge from SS pin, and perform the slow start of a power supply.

Thanks, Masami M.

  • 0
    TI__Genius 11095 points

    Hi Masami -

    The TPS54620 is a peak current mode control device. It implements current limit by clamping the Comp pin voltage. When the error amplifier output (comp) reaches the clamp value, the device detects an overcurrent event, and goes into cycle-by-cycle current limit. When this happens, the output voltage falls, and the output current is "clamped" at the overcurrent limit. 

    When this happens, the soft-start voltage is discharged, so that when the overload is removed, there will still be a slow-transition back to the regulation point. If this did not happen, there would be a huge current demand to re-charge the output capacitors, and because of the control loop, the output voltage might overshoot, as it tried to recover quickly. 

  • 0 in reply to Matt Schurmann
    Genius 5070 points

    Hi, Matt

    Thank you for your reply.
    I answer it to a customer.

    Thanks, Masami M.