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Comparison of two dual +-V output converter circuist: LT1930 vs LT8335

Hi,

I am studying on dual ouput converter based on SEPIC topology. I find from datasheets that both LT1930 and LT8335 could create a symmetrical dual output. Please see.

The pictures show clear that there are 2 kinds of circuts to create dual +-V outputs.

1, consists of 1 inductor and 4 Schottky diodes.

2, consists of 3 inductors (coupled) and 2 Schottky diodes.

My questions are:

Is the 2 circuits equivalent?

If they are quite different, what's the exact differences about their efficiency and output current capacity?

Is there a simple sign via which I could easily judged which kind of ICs should use which circuit?

Thank you very much!

Best Regards.

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  • Hi,

    The 2 circuits are not the same with the other one. The LT1930 diagram you have shown is a boost converter that can output a positive and negative output rail while the LT8335 is designed to configure with a SEPIC for the positive rail and a Cuk for the negative rail. If you need both positive and negative rail output for your converter and looking for the functionality of a SEPIC converter that has the capability of stepping-up or down a voltage supply, the LT8335 diagram you have shown exhibits this property since the LT1930, although has the capability of being configured on a SEPIC topology, does not have an example for +- rails example.

    Regards,

    Siglo

Reply
  • Hi,

    The 2 circuits are not the same with the other one. The LT1930 diagram you have shown is a boost converter that can output a positive and negative output rail while the LT8335 is designed to configure with a SEPIC for the positive rail and a Cuk for the negative rail. If you need both positive and negative rail output for your converter and looking for the functionality of a SEPIC converter that has the capability of stepping-up or down a voltage supply, the LT8335 diagram you have shown exhibits this property since the LT1930, although has the capability of being configured on a SEPIC topology, does not have an example for +- rails example.

    Regards,

    Siglo

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