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SN6501-Q1: SN6501-Q1

shuailin du
Prodigy 10 points
Part Number: SN6501-Q1
Other Parts Discussed in Thread: SN6501,

We want to use the SN6501-Q1 to generate isolate aux power, here, it is mentioned that due to the positive temperature coefficient of a MOSFET's on-resistance, the output FETs of the SN6501 have a self-correcting effect on V-t imbalance, so it can avoid the saturation of magnetic core. My question is how to ensure the timeliness of Rdson change due to temperature rise caused by the current imbalance, as we know that the temperature rise is slow. so if the difference of transformer is relatively large, how to solve this issue?

  • 0
    TI__Guru 55815 points

    Hi Shuailin,

    Welcome to TI E2E forum.

    Like you have pointed out, SN6501 does self-correct V-t imbalance to avoid saturation of magnetic core by having MOSFETs with positive temperature co-efficient on resistance. SN6501 can only correct for the imbalance caused by prolonged on-time on one leg compared to the other leg that may occur due to variations in samples. For solutions with symmetric transformer builds, we do not expect any further imbalances and you shouldn't need any additional components.

    If the transformer is not symmetrically built then the imbalance created can't be corrected by SN6501 and I am not aware of any external circuit that easily fix this imbalance. I will also try to check with colleagues if there are any suggestions in this regard. Thanks.

    Regards,

    Koteshwar Rao