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TLV704: + Transformer

Adi Selimovic
Intellectual 560 points
Part Number: TLV704
Other Parts Discussed in Thread: SN6501

Hello,

In an isolated application, 5V to 5V, what are positive and negative points of the following cases:

  1. Transformer 1:1.3 + TLV704
  2. Only Transformer 1:1.1

Best regards,
Adi

  • 0
    TI__Expert 4435 points
    Hi Adi,

    A transformer cannot be used to convert 5 VDC - 5 VDC directly. Transformers require AC or switching input to create a magnetic field across the transformer and produce an output.

    To accomplish an isolated 5V to 5V DC, you will need an isolated DC-DC converter:
    www.ti.com/.../overview.html

    I will move your post to the Isolated DC-DC converter e2e so you can get help there.
  • 0 in reply to Eric.Preiss
    Intellectual 560 points
    Hi Eric,

    Actually I refer to design with SN6501 and in its datasheet is written: "The 1:1.1 and 1:1.7 turns-ratios are designed for logic applications with wide supply rails and low load currents. These applications operate without LDO, thus achieving further cost-reduction".
    My question is formed according to these statements.

    Best regards,
    Adi
  • 0 in reply to Adi Selimovic
    TI__Expert 4435 points
    Hi Adi,

    SN6501 datasheet goes into detail on the differences between an unregulated output and a regulated output. Creating a regulated output by adding an LDO to the output of the SN6501 and transformer improves output voltage accuracy, transient performance, and ripple rejection.