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SN6501: SN6501 - limitation of capacitance of a transformer

MIKHAIL SALOV
Expert 6900 points
Part Number: SN6501

Good day Colleagues,

Could you tell me, what is a limitation for the capacitance of the transformer for the SN6501?

This is IC doesn't have a current limitation, so if the secondary coil has a big capacitance on the output, during a start up it's equivalent to short circuit on a secondary coil, so, it's like a short circuit on a primary coil.

Thank you, Mikhail

  • 0
    TI__Expert 6195 points

    Good day Mikhail!

    You are correct, the SN6501 does not have a current limitation and so a big capacitcance will appear as a short on the  primary coil.

    We have found a limit of 5uF for the SN6501, though there are a couple of ways around this. If you limit the current to the SN6501 externally you could allow for larger loads. You could also implement an external soft-start: here is an E2E post on one implementation of that. 

    Depending on your application, you could also consider the SN6505 which has a built in soft-start as well as a 1A output drive strength. 

    Let me know if I've answered your question!

    Best regards, 

    Dan

  • 0 in reply to Dan Kisling
    TI__Expert 6900 points
    Thank you, Dan,

    It helps!

    Mike