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PGA460: PGA460: Are these diodes (D1 & D2) necessary?

Oscar Gomez Fuente
Expert 2066 points
Part Number: PGA460

Hi everyone,

I'm working on a new design related to PGA460. I was reading the PGA460 datasheet and I do not understand the purpose of D1 and D2 and If they are necessary.

In my current design, I am going to use the IC TLV61046ADBVR to supply the PGA460 in exclusive. This is my schematic:

Is it necessary to use these two diodes?

Best regards.

  • 0
    TI__Mastermind 27950 points
    Hi Oscar,

    The two diodes on the VPWR line are in place for reverse battery protection (D1) and ESD protection (D2). They are typically required when connecting the VPWR pin directly to a car battery. For your implementation of an exclusive boost convert based supply, these diodes are not required.

    Also, I noticed you are using the DECPL feature. This feature is optional, and only required for temperature sensitive applications. If you do not need the decouple feature, then you can float the DECPL pin, remove the Q1 FET, and connect pin 6 of the transformer and C10 to ground directly. See PGA460 Mono-static Transducer Transformer Driver Ultra-Small Design File as an example of a simplified implementation (www.ti.com/.../slac757).
  • 0 in reply to Akeem Whitehead
    Expert 2066 points

    Hi Akeem,

    Thank you very much for your help.

    I am using a battery (primary lithium: 3.6V) to supply energy to boost converter. Do you think the same about these diodes (D1 & D2)?

    Best regards. 

  • 0 in reply to Oscar Gomez Fuente
    TI__Mastermind 27950 points
    Hi Oscar,

    As long as the VPWR pin is not exposed directly connected to the battery, the reverse battery protection diode (D1) and ESD protection diode (D2) still remain optional. These diodes are typically highly recommended for automotive use-cases.